Journal of Non-crystalline Solids最新文献_第2页

Low thermal expansion coefficient LAS glass-ceramics with petalite as the main crystal phase 以辉绿岩为主要晶相的低热膨胀系数 LAS 玻璃陶瓷

IF 3.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids

Pub Date : 2024-11-26 DOI: 10.1016/j.jnoncrysol.2024.123338

Shuo Tian , Man Zhou , Hao Yang Shen , Jun Jie Huang , Hao Zhang , Kai Ge Liu , Bin He , Ling Bing Kong

Li₂O–Al₂O₃–SiO₂ (LAS) glass-ceramics have been explored for nearly 80 years, due to their special properties, such as low/negative thermal expansion and high ionic conductivity, thus having commercial significance in various fields. In this study, LAS glass-ceramics based on petalite crystals were developed, which have promising mechanical, thermal properties and compactness, making them potential for applications in hollowwares, tablewares, containers, and plate glass industries. With given ratios of Al₂O₃/SiO₂, the crystalline phase is mainly affected by the concentration of Li₂O, where the content of Li₂O must be sufficiently low to form petalite LiAlSi₃O₈, thereby avoiding the formation of spodumene LiAlSi₂O₆. For this reason, CaF₂ was selected as a nucleating agent to increase the crystallinity of petalite, while the crystallization behavior of LiAlSi₃O₈ crystals was analyzed in detail. The average transmittance of 3.0 ± 0.2 mm thick glass-ceramics in the visible light region and infrared light region (400–1200 nm) is higher than 85 %. After crystallization at about 770 °C, the crystal size in the glass-ceramics is 100–200 nm, which is relatively dense and has excellent near-zero expansion coefficient. The minimum CTE_(25–325 _°C) is 1.0992 ppm/ °C, while the mechanical properties such as Vickers hardness, elastic modulus and flexural strength are significantly improved.

锂2O-Al2O3-SiO2（LAS）玻璃陶瓷具有低/负热膨胀和高离子导电性等特殊性能，因此在各个领域都具有重要的商业意义。本研究开发了基于辉绿岩晶体的 LAS 玻璃陶瓷，具有良好的机械性能、热性能和致密性，有望应用于中空制品、餐具、容器和平板玻璃行业。在给定的 Al2O3/SiO2 比例下，结晶相主要受 Li2O 浓度的影响，其中 Li2O 的含量必须足够低，才能形成花岗岩 LiAlSi3O8，从而避免形成沸石 LiAlSi2O6。为此，我们选择 CaF2 作为成核剂，以提高辉绿岩的结晶度，同时详细分析了 LiAlSi3O8 晶体的结晶行为。3.0 ± 0.2 毫米厚的玻璃陶瓷在可见光区和红外光区（400-1200 纳米）的平均透射率高于 85%。在约 770 °C 的温度下结晶后，玻璃陶瓷的晶体尺寸为 100-200 nm，密度相对较高，具有出色的近零膨胀系数。最小热膨胀系数（25-325 °C）为 1.0992 ppm/°C，而维氏硬度、弹性模量和抗弯强度等机械性能则显著提高。

{"title":"Low thermal expansion coefficient LAS glass-ceramics with petalite as the main crystal phase","authors":"Shuo Tian , Man Zhou , Hao Yang Shen , Jun Jie Huang , Hao Zhang , Kai Ge Liu , Bin He , Ling Bing Kong","doi":"10.1016/j.jnoncrysol.2024.123338","DOIUrl":"10.1016/j.jnoncrysol.2024.123338","url":null,"abstract":"<div><div>Li2O–Al2O3–SiO2 (LAS) glass-ceramics have been explored for nearly 80 years, due to their special properties, such as low/negative thermal expansion and high ionic conductivity, thus having commercial significance in various fields. In this study, LAS glass-ceramics based on petalite crystals were developed, which have promising mechanical, thermal properties and compactness, making them potential for applications in hollowwares, tablewares, containers, and plate glass industries. With given ratios of Al2O3/SiO2, the crystalline phase is mainly affected by the concentration of Li2O, where the content of Li2O must be sufficiently low to form petalite LiAlSi3O8, thereby avoiding the formation of spodumene LiAlSi2O6. For this reason, CaF2 was selected as a nucleating agent to increase the crystallinity of petalite, while the crystallization behavior of LiAlSi3O8 crystals was analyzed in detail. The average transmittance of 3.0 ± 0.2 mm thick glass-ceramics in the visible light region and infrared light region (400–1200 nm) is higher than 85 %. After crystallization at about 770 °C, the crystal size in the glass-ceramics is 100–200 nm, which is relatively dense and has excellent near-zero expansion coefficient. The minimum CTE(25–325 °C) is 1.0992 ppm/ °C, while the mechanical properties such as Vickers hardness, elastic modulus and flexural strength are significantly improved.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"649 ","pages":"Article 123338"},"PeriodicalIF":3.2,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142699663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantification of physical aging using two MDSC methods and its effect on initial properties of epoxy films 使用两种 MDSC 方法量化物理老化及其对环氧树脂薄膜初始特性的影响

IF 3.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids

Pub Date : 2024-11-25 DOI: 10.1016/j.jnoncrysol.2024.123335

Ismail Kada, Dao Trinh, Sébastien Touzain, Stéphanie Mallarino

In this work, the effect of aging times and temperatures on the generation of physical aging (P.A) is investigated, as well as its impact on the physico-chemical and mechanical properties of a model epoxy resin. The DGEBA/Jeffamine D230 system was tested with different amounts of P.A generated by applying steps of varying aging times and temperatures during the cooling. The quantification of P.A is carried out through modulated differential scanning calorimetry (MDSC) using two methods, based on the heat flow or the non-reversing heat flow. The results show that the P.A values obtained with the first method are lower than those obtained by the second method. The theorical model of Kohlrausch-Williams-Watts, used to describe the kinetic behavior of P.A process, showed that the second method underestimates the relaxation time. If no chemical change was observed between systems with and without P.A, the thermo-mechanical analysis showed that physical aging induces a storage modulus increase together with a free volume fraction decrease.

在这项工作中，研究了老化时间和温度对物理老化（P.A）产生的影响，以及物理老化对环氧树脂模型的物理化学和机械性能的影响。对 DGEBA/Jeffamine D230 体系进行了测试，在冷却过程中通过不同的老化时间和温度步骤产生了不同数量的 P.A。采用基于热流或非逆向热流的两种方法，通过调制差示扫描量热法（MDSC）对 P.A 进行量化。结果表明，第一种方法得到的 P.A 值低于第二种方法。用于描述 P.A 过程动力学行为的 Kohlrausch-Williams-Watts 理论模型表明，第二种方法低估了弛豫时间。如果在有 P.A 和没有 P.A 的体系之间没有观察到化学变化，那么热机械分析表明，物理老化会导致存储模量增加，同时自由体积分数下降。

{"title":"Quantification of physical aging using two MDSC methods and its effect on initial properties of epoxy films","authors":"Ismail Kada, Dao Trinh, Sébastien Touzain, Stéphanie Mallarino","doi":"10.1016/j.jnoncrysol.2024.123335","DOIUrl":"10.1016/j.jnoncrysol.2024.123335","url":null,"abstract":"<div><div>In this work, the effect of aging times and temperatures on the generation of physical aging (P.A) is investigated, as well as its impact on the physico-chemical and mechanical properties of a model epoxy resin. The DGEBA/Jeffamine D230 system was tested with different amounts of P.A generated by applying steps of varying aging times and temperatures during the cooling. The quantification of P.A is carried out through modulated differential scanning calorimetry (MDSC) using two methods, based on the heat flow or the non-reversing heat flow. The results show that the P.A values obtained with the first method are lower than those obtained by the second method. The theorical model of Kohlrausch-Williams-Watts, used to describe the kinetic behavior of P.A process, showed that the second method underestimates the relaxation time. If no chemical change was observed between systems with and without P.A, the thermo-mechanical analysis showed that physical aging induces a storage modulus increase together with a free volume fraction decrease.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"649 ","pages":"Article 123335"},"PeriodicalIF":3.2,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142699665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of Bi2O3 on structural and optical characteristics of PbO⋅B2O3⋅Bi2O3⋅SiO2 glasses Bi2O3 对 PbO⋅B2O3⋅Bi2O3⋅SiO2 玻璃结构和光学特性的影响

IF 3.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids

Pub Date : 2024-11-25 DOI: 10.1016/j.jnoncrysol.2024.123330

Sumit Chauhan , Rajni Bala , Divya Yadav , Sanjay Gaur

In this study, the influence of Bi₂O₃ on the structural and optical characteristics of the glass samples with the molar composition of 17PbO⋅23B₂O₃⋅xBi₂O₃⋅(60-x)SiO₂, prepared using the conventional melt quenching approach, is described. X-ray diffraction spectra reveal the amorphous nature of the prepared series. Density (D), molar volume (V_m), glass transition temperature (T_g), and other physical parameters have been evaluated. FTIR spectra show the presence of bismuth as [BiO₃] and [BiO₆] structural units and of borate as [BO₃] and [BO₄] structural units. It is found that the increase in non-bridging oxygens can be attributed to the increase in cut-off wavelength and decrease in bandgap energy with the rise in bismuth concentration. Urbach's energy values demonstrate that the presence of Bi₂O₃ in the existing glass system might affect the defect concentration. All glass samples possess a high refractive index suggesting that the current glasses may be useful for developing non-linear optical systems.

本研究介绍了 Bi2O3 对摩尔组成为 17PbO⋅23B2O3⋅xBi2O3⋅(60-x)SiO2 的玻璃样品结构和光学特性的影响，这些玻璃样品是采用传统的熔体淬火方法制备的。X 射线衍射光谱显示了所制备系列的无定形性质。对密度（D）、摩尔体积（Vm）、玻璃化转变温度（Tg）和其他物理参数进行了评估。傅立叶变换红外光谱显示铋的结构单元为 [BiO3] 和 [BiO6]，硼酸盐的结构单元为 [BO3] 和 [BO4]。研究发现，随着铋浓度的增加，非桥氧基的增加可归因于截止波长的增加和带隙能的降低。Urbach 的能量值表明，现有玻璃体系中 Bi2O3 的存在可能会影响缺陷浓度。所有玻璃样品都具有较高的折射率，这表明目前的玻璃可用于开发非线性光学系统。

{"title":"Influence of Bi2O3 on structural and optical characteristics of PbO⋅B2O3⋅Bi2O3⋅SiO2 glasses","authors":"Sumit Chauhan , Rajni Bala , Divya Yadav , Sanjay Gaur","doi":"10.1016/j.jnoncrysol.2024.123330","DOIUrl":"10.1016/j.jnoncrysol.2024.123330","url":null,"abstract":"<div><div>In this study, the influence of Bi2O3 on the structural and optical characteristics of the glass samples with the molar composition of 17PbO⋅23B2O3⋅xBi2O3⋅(60-x)SiO2, prepared using the conventional melt quenching approach, is described. X-ray diffraction spectra reveal the amorphous nature of the prepared series. Density (D), molar volume (Vm), glass transition temperature (Tg), and other physical parameters have been evaluated. FTIR spectra show the presence of bismuth as [BiO3] and [BiO6] structural units and of borate as [BO3] and [BO4] structural units. It is found that the increase in non-bridging oxygens can be attributed to the increase in cut-off wavelength and decrease in bandgap energy with the rise in bismuth concentration. Urbach's energy values demonstrate that the presence of Bi2O3 in the existing glass system might affect the defect concentration. All glass samples possess a high refractive index suggesting that the current glasses may be useful for developing non-linear optical systems.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"649 ","pages":"Article 123330"},"PeriodicalIF":3.2,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142699664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of titanium redox states on luminescence and conductivity in TiO2 -doped borophosphate glass system 掺杂硼磷酸盐的二氧化钛玻璃体系中钛氧化还原态对发光和导电性的影响

IF 3.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids

Pub Date : 2024-11-25 DOI: 10.1016/j.jnoncrysol.2024.123334

Rashmi I, Avinash Ingle, Vasundhara Raghuvanshi, H.D. Shashikala, H.S. Nagaraja

Borophosphate glasses have garnered significant interest due to their potential for optical and electronic applications. This research delves into the luminescent and conductive properties of 40P₂O₅–25B₂O₃-(35-x) BaO-xTiO₂ (x = 0–5 mol%) glasses synthesized via the melt-quench method. The glass doped with 4 mol% TiO₂ exhibited intense luminescence within the 400–600 nm spectrum, manifesting as a vivid blue emission and the highest Ti³⁺ ion concentration. Beyond this threshold, the luminescence intensity waned, highlighting the significance of Ti⁴⁺/Ti³⁺ ratios. Absorption spectra and X-ray photoelectron spectroscopy were utilized to study these multivalent ions. Temperature-dependent AC conductivity, exhibited a linear increase, consistent with the Correlated Barrier Hopping (CBH) model. Enhanced polaron hopping between Ti³⁺ and Ti⁴⁺ with increasing TiO₂ content improved the dielectric constant and conductivity, peaking at 4.145×10⁻⁵ Scm⁻¹ at 5 mol% TiO₂ within the 450–530 °C range. These findings underscore the tunability of TiO₂-doped glasses for optoelectronic applications.

硼磷酸盐玻璃因其在光学和电子应用方面的潜力而备受关注。本研究深入探讨了通过熔融淬火法合成的 40P2O5-25B2O3-(35-x) BaO-xTiO2 （x = 0-5 mol%）玻璃的发光和导电特性。掺杂了 4 摩尔% TiO2 的玻璃在 400-600 纳米光谱范围内呈现出强烈的发光，表现为鲜艳的蓝色发射和最高的 Ti3+ 离子浓度。超过这一阈值后，发光强度减弱，这突出了 Ti4+/Ti3+ 比率的重要性。我们利用吸收光谱和 X 射线光电子能谱来研究这些多价离子。与温度相关的交流电导率呈线性增长，与相关势垒跳变（CBH）模型一致。随着 TiO2 含量的增加，Ti3+ 和 Ti4+ 之间的极子跳动增强，介电常数和电导率得到改善，在 450-530 °C 范围内，当 TiO2 含量为 5 摩尔时，峰值为 4.145×10-5 Scm-1。这些发现强调了掺杂 TiO2 的玻璃在光电应用中的可调性。

{"title":"Influence of titanium redox states on luminescence and conductivity in TiO2 -doped borophosphate glass system","authors":"Rashmi I, Avinash Ingle, Vasundhara Raghuvanshi, H.D. Shashikala, H.S. Nagaraja","doi":"10.1016/j.jnoncrysol.2024.123334","DOIUrl":"10.1016/j.jnoncrysol.2024.123334","url":null,"abstract":"<div><div>Borophosphate glasses have garnered significant interest due to their potential for optical and electronic applications. This research delves into the luminescent and conductive properties of 40P2O5–25B2O3-(35-x) BaO-xTiO2 (x = 0–5 mol%) glasses synthesized via the melt-quench method. The glass doped with 4 mol% TiO2 exhibited intense luminescence within the 400–600 nm spectrum, manifesting as a vivid blue emission and the highest Ti3+ ion concentration. Beyond this threshold, the luminescence intensity waned, highlighting the significance of Ti4+/Ti3+ ratios. Absorption spectra and X-ray photoelectron spectroscopy were utilized to study these multivalent ions. Temperature-dependent AC conductivity, exhibited a linear increase, consistent with the Correlated Barrier Hopping (CBH) model. Enhanced polaron hopping between Ti3+ and Ti4+ with increasing TiO2 content improved the dielectric constant and conductivity, peaking at 4.145×10−5 Scm−1 at 5 mol% TiO2 within the 450–530 °C range. These findings underscore the tunability of TiO2-doped glasses for optoelectronic applications.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"649 ","pages":"Article 123334"},"PeriodicalIF":3.2,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142699662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CO induces the reduction of Mo in the glass liquid to molybdenum carbide to form glass defects in the hybrid furnace 二氧化碳促使玻璃液中的钼还原成碳化钼，从而在混合炉中形成玻璃缺陷

IF 3.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids

Pub Date : 2024-11-23 DOI: 10.1016/j.jnoncrysol.2024.123337

Di Ao, YanXin Li, Xuan Hu, XiGuang Zhou, LiFan Wu, Liang Song, Tuo Wang, JinLu Jiang, XiaoJian Zhang, XiaoYong Kou

In this work, a ceramic platinum continuous melting optical glass furnace containing oxygen combustion was taken as an example to analyze the causes of a unique glass defect. It was finally determined that the defect in the glass was composed of the top condensate, the brick skeleton, and the Mo₂C generated in the glass liquid. It was determined that the monoclinic Al₂O₃ and ZrO₂ phase in the brick desorbed the surface hydroxyl and water molecules under the high temperature environment inside the furnace, forming Lewis acid sites with the ability to adsorb electrons. CO was adsorbed on the surface of Al₂O₃ and ZrO₂ by Lewis acid sites and fell into the glass liquid with the top condensate and the brick skeleton.CO then reduced Mo ions in the glass melt to form Mo₂C, causing the formation of the defects in the glass.

本研究以含氧燃烧的陶瓷铂连续熔化光学玻璃炉为例，分析了一种独特玻璃缺陷的成因。最终确定玻璃缺陷由顶部冷凝物、砖骨架和玻璃液中生成的 Mo2C 组成。经测定，砖中的单斜Al2O3和ZrO2相在炉内高温环境下解吸了表面羟基和水分子，形成了具有吸附电子能力的路易斯酸位点。CO 被路易斯酸位点吸附在 Al2O3 和 ZrO2 表面，并随顶部冷凝物和砖骨架一起落入玻璃液中，然后在玻璃熔体中还原 Mo 离子形成 Mo2C，导致玻璃缺陷的形成。

引用次数: 0

From SiO1.5CH3 to vitreous SiO2: A structural evolution study 从 SiO1.5CH3 到玻璃状 SiO2：结构演变研究

IF 3.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids

Pub Date : 2024-11-21 DOI: 10.1016/j.jnoncrysol.2024.123327

M. Cassetta , G.D. Sorarù , E. Callone , S. Dirè , A.M. Abebe , S. Mariazzi , R.S. Brusa , M. Giarola , N. Daldosso , M. Biesuz

The conversion of SiO_1.5CH₃ into SiO₂ glass by pyrolysis in air has been studied by combining density measurements, vibrational spectroscopy, positron annihilation spectroscopy, and nuclear magnetic resonance. The results show that a critical transition takes place between 400 and 500 °C and at 600 °C the organic features are completely removed. The conversion of the hybrid structure into a fully inorganic network takes place through the formation of metastable 3-membered rings that progressively evolve into more stable 5+ rings as the pyrolysis temperature increases. The evolution of the organic moieties is coupled with the formation of Si-OH and molecular water trapped in the network which are well visible between 500 and 800 °C. In such temperature regions, a clear evolution of the network density can be detected, though the amount of free volume is nearly constant (due to the presence of trapped H₂O). Only at 1250 °C, the network is comparable with a melt-derived glass.

通过结合密度测定、振动光谱、正电子湮灭光谱和核磁共振，对 SiO1.5CH3 在空气中热解转化为 SiO2 玻璃的过程进行了研究。结果表明，在 400 至 500 °C 之间发生了临界转变，600 °C 时有机特征完全消失。杂化结构转化为完全无机网络的过程中形成了可褪色的三元环，随着热解温度的升高，这些三元环逐渐演变为更稳定的五元环。有机分子的演化与网络中截留的 Si-OH 和分子水的形成密切相关，这在 500 至 800 °C 之间非常明显。在这些温度区域，虽然自由体积几乎保持不变（由于存在被截留的 H2O），但可以检测到网络密度的明显变化。只有在 1250 °C 时，网络才能与熔融衍生玻璃相媲美。

{"title":"From SiO1.5CH3 to vitreous SiO2: A structural evolution study","authors":"M. Cassetta , G.D. Sorarù , E. Callone , S. Dirè , A.M. Abebe , S. Mariazzi , R.S. Brusa , M. Giarola , N. Daldosso , M. Biesuz","doi":"10.1016/j.jnoncrysol.2024.123327","DOIUrl":"10.1016/j.jnoncrysol.2024.123327","url":null,"abstract":"<div><div>The conversion of SiO1.5CH3 into SiO2 glass by pyrolysis in air has been studied by combining density measurements, vibrational spectroscopy, positron annihilation spectroscopy, and nuclear magnetic resonance. The results show that a critical transition takes place between 400 and 500 °C and at 600 °C the organic features are completely removed. The conversion of the hybrid structure into a fully inorganic network takes place through the formation of metastable 3-membered rings that progressively evolve into more stable 5+ rings as the pyrolysis temperature increases. The evolution of the organic moieties is coupled with the formation of Si-OH and molecular water trapped in the network which are well visible between 500 and 800 °C. In such temperature regions, a clear evolution of the network density can be detected, though the amount of free volume is nearly constant (due to the presence of trapped H2O). Only at 1250 °C, the network is comparable with a melt-derived glass.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"648 ","pages":"Article 123327"},"PeriodicalIF":3.2,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electrical transport and dielectric relaxation in 5Fe2O3–40ZnO-55P2O5 iron zinc phosphate bulk glass 5Fe2O3-40ZnO-55P2O5 磷酸铁锌块状玻璃中的电迁移和介电弛豫

IF 3.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids

Pub Date : 2024-11-20 DOI: 10.1016/j.jnoncrysol.2024.123311

Petr Viščor , Zdeněk Černošek , Katarína Faturíková , Jana Holubová , Robert Klement , Marek Liška , Ladislav Tichý

Electrical Impedance Spectroscopy (EIS) and Optical Spectroscopy (OS) experimental techniques have been used to investigate some basic and important aspects of the electronic band structure, electrical transport and dielectric relaxation in 5Fe₂O₃–40ZnO–55P₂O₅ iron zinc phosphate bulk glass. The temperature dependence of the dc electrical conductivity, as determined by EIS, showed a simple Arhenius behaviour, with activation energy of ∼1 eV, a value shared by a large number of other glassy systems. The EIS measurements revealed also a number of discrete dielectric relaxation processes, some of them possessing a non-exponential “universal” behaviour. The temperature dependence of the characteristic frequency of one of these dielectric relaxation processes was found to be related to the observed values of dc electrical conductivity at the same temperatures through Barton-Namikawa-Nakajima (BNN) relation. Based on the analysis of both the optical and the electrical measurements, it is concluded that the dc electrical transport is due to hole small polaron hopping, but the Fe sites are not the hopping sites. Rather, the added Fe atoms in their possible different charge states within the glassy matrix act as strongly localised acceptor sites (bands) and the dc electrical transport then takes place via self-trapped holes, originating from the remaining singly occupied electron states (holes) at the top of the valence band tails in studied glass. The existence of “defect” acceptor bands in the vicinity of the valence bands in wider band gap glassy materials and subsequent hole self-trapping is proposed to be a general trend and the cause of largely p-type behaviour and polaronic type of electrical conduction in these systems.

我们利用电阻抗光谱（EIS）和光学光谱（OS）实验技术研究了 5Fe2O3-40ZnO-55P2O5 磷酸铁锌块状玻璃的电子能带结构、电传输和介电弛豫的一些基本和重要方面。通过 EIS 测定的直流电导的温度依赖性显示出简单的阿伦尼乌斯行为，活化能为 ∼ 1 eV，这是大量其他玻璃体系所共有的值。EIS 测量还揭示了一些离散的介电弛豫过程，其中一些具有非指数的 "普遍 "行为。通过巴顿-南川-中岛（BNN）关系，发现其中一个介电弛豫过程的特征频率与相同温度下观察到的直流电导率值有关。根据对光学和电学测量结果的分析，可以得出结论：直流电传输是由于空穴小极子跳变造成的，但铁原子位点并不是跳变位点。相反，玻璃基质中可能处于不同电荷状态的添加铁原子充当了强局部受体位点（带），然后通过自捕空穴进行直流电传输，这些空穴来自所研究玻璃中价带尾顶部剩余的单占电子态（空穴）。在带隙较宽的玻璃材料中，价带附近存在 "缺陷 "受体带以及随后的空穴自俘获被认为是一种普遍的趋势，也是这些系统主要呈现 p 型行为和极性电导的原因。

{"title":"Electrical transport and dielectric relaxation in 5Fe2O3–40ZnO-55P2O5 iron zinc phosphate bulk glass","authors":"Petr Viščor , Zdeněk Černošek , Katarína Faturíková , Jana Holubová , Robert Klement , Marek Liška , Ladislav Tichý","doi":"10.1016/j.jnoncrysol.2024.123311","DOIUrl":"10.1016/j.jnoncrysol.2024.123311","url":null,"abstract":"<div><div>Electrical Impedance Spectroscopy (EIS) and Optical Spectroscopy (OS) experimental techniques have been used to investigate some basic and important aspects of the electronic band structure, electrical transport and dielectric relaxation in 5Fe2O3–40ZnO–55P2O5 iron zinc phosphate bulk glass. The temperature dependence of the dc electrical conductivity, as determined by EIS, showed a simple Arhenius behaviour, with activation energy of ∼1 eV, a value shared by a large number of other glassy systems. The EIS measurements revealed also a number of discrete dielectric relaxation processes, some of them possessing a non-exponential “universal” behaviour. The temperature dependence of the characteristic frequency of one of these dielectric relaxation processes was found to be related to the observed values of dc electrical conductivity at the same temperatures through Barton-Namikawa-Nakajima (BNN) relation. Based on the analysis of both the optical and the electrical measurements, it is concluded that the dc electrical transport is due to hole small polaron hopping, but the Fe sites are not the hopping sites. Rather, the added Fe atoms in their possible different charge states within the glassy matrix act as strongly localised acceptor sites (bands) and the dc electrical transport then takes place via self-trapped holes, originating from the remaining singly occupied electron states (holes) at the top of the valence band tails in studied glass. The existence of “defect” acceptor bands in the vicinity of the valence bands in wider band gap glassy materials and subsequent hole self-trapping is proposed to be a general trend and the cause of largely p-type behaviour and polaronic type of electrical conduction in these systems.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"648 ","pages":"Article 123311"},"PeriodicalIF":3.2,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effective attainment of a substantial proportion of the PbTiO3 crystalline phase through a non-isothermal crystallization process 通过非等温结晶工艺有效获得大量 PbTiO3 结晶相

IF 3.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids

Pub Date : 2024-11-20 DOI: 10.1016/j.jnoncrysol.2024.123323

M.G. Moustafa , A.K. Aladim , Hesham Y. Amin , S. Kubuki , A. Ibrahim

The crystallization kinetics studies were performed on a lead–titanium borate glass with a composition 50PbO–25TiO₂–25B₂O₃ (mol %) to well understand the crystallization process by a non-isothermal method in an attempt to obtain a substantial proportion of the lead titanate (PbTiO₃) crystalline phase. Based on the DTA result, the glassy material was heat-treated to induce crystallization and then produced a glass-ceramic. The broad hump observed in the XRD patterns of a glassy sample affirmed its amorphous nature. However, XRD studies conducted on a glass-ceramic revealed the evolution of the crystalline phase of PbTiO₃ and a minor phase of TiO₂. The phase relationship of PbTiO₃ resulting from the reaction between PbO and TiO₂ during a non-isothermal crystallization process has been examined. The activation energy for the crystallization of PbTiO₃ is evaluated to be 135 kJ/mol (at PbO/TiO₂ ratio = 2/1 mol %). When the Pb/Ti ratio exceeds 1, the process progresses nearly to completion by the first crystallization peak, and the PbTiO₃ phase formation is easier. The fraction of PbTiO₃ phase in the present glass is 98.3 % at PbO/TiO₂ ratio = 2/1 mol %. In addition, FTIR spectra provided the presence of Ti⁴⁺ ions in the glass-ceramic. According to the values of crystal growth and Avrami index, surface crystallization and one-dimensional growth mechanisms are suitable mechanisms for contributing to the crystallization of this glassy sample. The obtained findings provided details on the crystallization behaviour of this glassy sample and excellent insight into obtaining the PbTiO₃ crystalline phase in a large proportion, which is of great importance in future technological applications.

为了充分了解结晶过程，我们采用非等温方法对成分为 50PbO-25TiO2-25B2O3 (mol %) 的硼酸铅钛玻璃进行了结晶动力学研究，试图获得相当比例的钛酸铅（PbTiO3）结晶相。根据 DTA 结果，对玻璃状材料进行热处理以诱导结晶，然后生产出玻璃陶瓷。在玻璃状样品的 XRD 图谱中观察到的宽驼峰证实了其无定形性质。然而，对玻璃陶瓷进行的 XRD 研究显示了 PbTiO3 结晶相和少量 TiO2 相的演变。在非等温结晶过程中，对 PbO 和 TiO2 反应生成的 PbTiO3 的相关系进行了研究。据估计，PbTiO3 结晶的活化能为 135 kJ/mol（PbO/TiO2 比率 = 2/1 mol %）。当 Pb/Ti 比率超过 1 时，该过程几乎在第一个结晶峰出现时完成，PbTiO3 相的形成也更容易。当 PbO/TiO2 比率 = 2/1 mol % 时，本玻璃中 PbTiO3 相的比例为 98.3 %。此外，傅立叶变换红外光谱显示玻璃陶瓷中存在 Ti4+ 离子。根据晶体生长值和阿夫拉米指数，表面结晶和一维生长机制是该玻璃样品结晶的合适机制。研究结果提供了该玻璃样品结晶行为的详细信息，并为获得大比例的 PbTiO3 结晶相提供了极好的见解，这在未来的技术应用中具有重要意义。

{"title":"Effective attainment of a substantial proportion of the PbTiO3 crystalline phase through a non-isothermal crystallization process","authors":"M.G. Moustafa , A.K. Aladim , Hesham Y. Amin , S. Kubuki , A. Ibrahim","doi":"10.1016/j.jnoncrysol.2024.123323","DOIUrl":"10.1016/j.jnoncrysol.2024.123323","url":null,"abstract":"<div><div>The crystallization kinetics studies were performed on a lead–titanium borate glass with a composition 50PbO–25TiO2–25B2O3 (mol %) to well understand the crystallization process by a non-isothermal method in an attempt to obtain a substantial proportion of the lead titanate (PbTiO3) crystalline phase. Based on the DTA result, the glassy material was heat-treated to induce crystallization and then produced a glass-ceramic. The broad hump observed in the XRD patterns of a glassy sample affirmed its amorphous nature. However, XRD studies conducted on a glass-ceramic revealed the evolution of the crystalline phase of PbTiO3 and a minor phase of TiO2. The phase relationship of PbTiO3 resulting from the reaction between PbO and TiO2 during a non-isothermal crystallization process has been examined. The activation energy for the crystallization of PbTiO3 is evaluated to be 135 kJ/mol (at PbO/TiO2 ratio = 2/1 mol %). When the Pb/Ti ratio exceeds 1, the process progresses nearly to completion by the first crystallization peak, and the PbTiO3 phase formation is easier. The fraction of PbTiO3 phase in the present glass is 98.3 % at PbO/TiO2 ratio = 2/1 mol %. In addition, FTIR spectra provided the presence of Ti4+ ions in the glass-ceramic. According to the values of crystal growth and Avrami index, surface crystallization and one-dimensional growth mechanisms are suitable mechanisms for contributing to the crystallization of this glassy sample. The obtained findings provided details on the crystallization behaviour of this glassy sample and excellent insight into obtaining the PbTiO3 crystalline phase in a large proportion, which is of great importance in future technological applications.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"648 ","pages":"Article 123323"},"PeriodicalIF":3.2,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

FTIR-ATR spectroscopic study and statistical modeling of composition-structure-property of MgO-CaO-Al2O3-SiO2 Glasses with and without Boron 含硼和不含硼的 MgO-CaO-Al2O3-SiO2 玻璃的傅立叶变换红外-原子吸收光谱研究和成分-结构-性能统计建模

IF 3.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids

Pub Date : 2024-11-17 DOI: 10.1016/j.jnoncrysol.2024.123324

Gülin Demirok , Semin Atilgan , Hong Li

E-Glass fibers with and without boron have been widely used in commercial composite materials as a lightweight strong and durable reinforcement material. Previously, the Raman spectroscopic method has been successfully applied to study quaternary system MgO-CaO-Al₂O₃-SiO₂ (MACS) without boron and the network structures derived from Raman analysis have been used to model various glass properties relevant for processing, and composite mechanical application. In this study, FTIR (Fourier transform infrared)—ATR (total attenuated reflectance was applied to study a set of new MCAS glasses with and without boron to explore the feasibility in the development of a statistical-based database, composition–structure-property (C-S-P), for new glass design by using ATR method. Should a glass developer not have access to a Raman spectrometer, results from the current study support the use of ATR methodology to develop the C-S-P database. Furthermore, as demonstrated from this study, the use of the ATR method also avoids the complication of IR hydroxyl band interference with the curve deconvolution analysis, which occurs from the use of KBr chemical as a carrier matrix for conducting FTIR measurement in a transmission mode.

含硼和不含硼的电子玻璃纤维作为一种轻质、坚固、耐用的增强材料已被广泛应用于商用复合材料中。此前，拉曼光谱方法已被成功应用于研究不含硼的四元系 MgO-CaO-Al2O3-SiO2 (MACS)，拉曼分析得出的网络结构已被用于模拟与加工和复合材料机械应用相关的各种玻璃特性。在本研究中，傅立叶变换红外（FTIR）-全衰减反射（ATR）被用于研究一组含硼和不含硼的新型 MCAS 玻璃，以探索使用 ATR 方法为新型玻璃设计开发基于统计的成分-结构-性能（C-S-P）数据库的可行性。如果玻璃开发人员没有拉曼光谱仪，本研究的结果支持使用 ATR 方法开发 C-S-P 数据库。此外，如本研究所示，使用 ATR 方法还可避免红外羟基带对曲线解卷积分析的干扰，这种干扰是在透射模式下使用 KBr 化学物质作为载体基质进行傅立叶变换红外测量时产生的。

{"title":"FTIR-ATR spectroscopic study and statistical modeling of composition-structure-property of MgO-CaO-Al2O3-SiO2 Glasses with and without Boron","authors":"Gülin Demirok , Semin Atilgan , Hong Li","doi":"10.1016/j.jnoncrysol.2024.123324","DOIUrl":"10.1016/j.jnoncrysol.2024.123324","url":null,"abstract":"<div><div>E-Glass fibers with and without boron have been widely used in commercial composite materials as a lightweight strong and durable reinforcement material. Previously, the Raman spectroscopic method has been successfully applied to study quaternary system MgO-CaO-Al2O3-SiO2 (MACS) without boron and the network structures derived from Raman analysis have been used to model various glass properties relevant for processing, and composite mechanical application. In this study, FTIR (Fourier transform infrared)—ATR (total attenuated reflectance was applied to study a set of new MCAS glasses with and without boron to explore the feasibility in the development of a statistical-based database, composition–structure-property (C-S-P), for new glass design by using ATR method. Should a glass developer not have access to a Raman spectrometer, results from the current study support the use of ATR methodology to develop the C-S-P database. Furthermore, as demonstrated from this study, the use of the ATR method also avoids the complication of IR hydroxyl band interference with the curve deconvolution analysis, which occurs from the use of KBr chemical as a carrier matrix for conducting FTIR measurement in a transmission mode.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"648 ","pages":"Article 123324"},"PeriodicalIF":3.2,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving the amorphous forming ability of FeSiBPCu nanocrystalline alloys by substituting Cu with C 用 C 取代 Cu 提高 FeSiBPCu 纳米晶合金的非晶形成能力

IF 3.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids

Pub Date : 2024-11-16 DOI: 10.1016/j.jnoncrysol.2024.123313

Jiarui Hu, Siqian Bao, Yuanyao Cheng, Chen Liu, Yin Zhao, Yuxin Liu, Jiaqi Chang

This study aims to improve the amorphous forming ability (AFA) of FeSiBPCu nanocrystalline alloys and simplify their industrial production process. We investigated the AFA and soft magnetic properties of a series of Fe₈₅Si₂B₉P₃Cu_1-xC_x (x = 0, 0.3, 0.5, 0.7 and 1) by substituting for Cu with C. The results show that the substitution method significantly reduces the preparation requirements for producing of amorphous alloys in the quenched state. By selecting an annealing of 480 °C for 330 s, which corresponds to the interval between the first and second crystallization temperatures, we achieved nanocrystalline phases with fine sizes. The annealed Fe₈₅Si₂B₉P₃Cu_1-xC_x alloy exhibits an increase in grain size and coercivity (H_c). Notably, the Fe₈₅Si₂B₉P₃Cu_0.7C_0.3 nanocrystalline ribbons with high saturation magnetization strength (B_s) of 1.8 T and low H_c of 9.8 A/m demonstrate excellent soft magnetic properties and low production process requirements, indicating significant potential applications.

本研究旨在提高 FeSiBPCu 纳米晶合金的非晶形成能力（AFA），并简化其工业化生产过程。我们研究了用 C 替代 C 的一系列 Fe85Si2B9P3Cu1-xCx （x = 0、0.3、0.5、0.7 和 1）的非晶形成能力和软磁特性。通过选择 480 °C 退火 330 秒（相当于第一和第二结晶温度之间的时间间隔），我们获得了具有细小尺寸的纳米晶相。退火后的 Fe85Si2B9P3Cu1-xCx 合金显示出晶粒尺寸和矫顽力（Hc）的增加。值得注意的是，Fe85Si2B9P3Cu0.7C0.3 纳米晶带具有 1.8 T 的高饱和磁化强度（Bs）和 9.8 A/m 的低 Hc，表现出优异的软磁特性和较低的生产工艺要求，具有巨大的应用潜力。

{"title":"Improving the amorphous forming ability of FeSiBPCu nanocrystalline alloys by substituting Cu with C","authors":"Jiarui Hu, Siqian Bao, Yuanyao Cheng, Chen Liu, Yin Zhao, Yuxin Liu, Jiaqi Chang","doi":"10.1016/j.jnoncrysol.2024.123313","DOIUrl":"10.1016/j.jnoncrysol.2024.123313","url":null,"abstract":"<div><div>This study aims to improve the amorphous forming ability (AFA) of FeSiBPCu nanocrystalline alloys and simplify their industrial production process. We investigated the AFA and soft magnetic properties of a series of Fe85Si2B9P3Cu1-xCx (x = 0, 0.3, 0.5, 0.7 and 1) by substituting for Cu with C. The results show that the substitution method significantly reduces the preparation requirements for producing of amorphous alloys in the quenched state. By selecting an annealing of 480 °C for 330 s, which corresponds to the interval between the first and second crystallization temperatures, we achieved nanocrystalline phases with fine sizes. The annealed Fe85Si2B9P3Cu1-xCx alloy exhibits an increase in grain size and coercivity (Hc). Notably, the Fe85Si2B9P3Cu0.7C0.3 nanocrystalline ribbons with high saturation magnetization strength (Bs) of 1.8 T and low Hc of 9.8 A/m demonstrate excellent soft magnetic properties and low production process requirements, indicating significant potential applications.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"648 ","pages":"Article 123313"},"PeriodicalIF":3.2,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0