Pub Date : 2024-10-16DOI: 10.1016/j.jnoncrysol.2024.123260
Yanyan Song , Shaoxiong Zhou , Zhi Zhang , Ruibiao Zhang , Xiantao Li , Xueyan Jing
FeSiBCuNb nanocrystalline powder was mixed with FeNi at varying weight ratios to fabricate toroidal powder cores through cold pressing. The effect of FeNi powder content on the soft magnetic properties of the powder cores was meticulously investigated, leading to a meaningful discovery. The optimal performance was achieved when the FeNi ratio is 50 wt.%, with a μe of 59.3, a DC-bias performance of 65.6% at a DC magnetic field strength of 100 Oe, and a Pcv of 99.8 kW/m3 at 100 kHz under 50 mT conditions. Compared to the powder cores without FeNi addition, there was a remarkable improvement in μe by 91% and a significant reduction in Pcv by 45.4%. This improvement can be attributed to the role of FeNi as void-filling particles, which effectively enhance the soft magnetic properties of the nanocrystalline FeSiBCuNb powder cores.
{"title":"Improvement for soft magnetic properties of FeSiBCuNb nanocrystalline powder cores by adding FeNi powder","authors":"Yanyan Song , Shaoxiong Zhou , Zhi Zhang , Ruibiao Zhang , Xiantao Li , Xueyan Jing","doi":"10.1016/j.jnoncrysol.2024.123260","DOIUrl":"10.1016/j.jnoncrysol.2024.123260","url":null,"abstract":"<div><div>FeSiBCuNb nanocrystalline powder was mixed with FeNi at varying weight ratios to fabricate toroidal powder cores through cold pressing. The effect of FeNi powder content on the soft magnetic properties of the powder cores was meticulously investigated, leading to a meaningful discovery. The optimal performance was achieved when the FeNi ratio is 50 wt.%, with a <em>μ</em><sub>e</sub> of 59.3, a DC-bias performance of 65.6% at a DC magnetic field strength of 100 Oe, and a <em>P</em><sub>cv</sub> of 99.8 kW/m<sup>3</sup> at 100 kHz under 50 mT conditions. Compared to the powder cores without FeNi addition, there was a remarkable improvement in <em>μ</em><sub>e</sub> by 91% and a significant reduction in <em>P</em><sub>cv</sub> by 45.4%. This improvement can be attributed to the role of FeNi as void-filling particles, which effectively enhance the soft magnetic properties of the nanocrystalline FeSiBCuNb powder cores.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"646 ","pages":"Article 123260"},"PeriodicalIF":3.2,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142440999","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}
Pub Date : 2024-10-16DOI: 10.1016/j.jnoncrysol.2024.123262
Pavel Hrma , Pavel Ferkl , Richard Pokorný , Albert A. Kruger
We analyze the heat transfer between the melt pool and the layer of reacting materials called cold cap, which is the determining factor for the glass production rate in Joule-heated air-bubbled nuclear waste glass melters. We consider the effects of bubbling rate, melt viscosity, melt thermal conductivity, conversion kinetics, and shear rate at the cold-cap bottom, and develop simple relationships for the cold-cap bottom temperature and glass production rate. We show that the melt convection enhances the heat transfer to the cold cap by suppressing the thermal boundary layer and primary foam, while the conversion kinetics opposes these effects. Additionally, we mention how dissolving silica particles affects the primary foam stability and discuss the limitations of the presented approach for vigorously foaming feeds.
{"title":"Effect of cold-cap-bottom shear stress on primary foam stability","authors":"Pavel Hrma , Pavel Ferkl , Richard Pokorný , Albert A. Kruger","doi":"10.1016/j.jnoncrysol.2024.123262","DOIUrl":"10.1016/j.jnoncrysol.2024.123262","url":null,"abstract":"<div><div>We analyze the heat transfer between the melt pool and the layer of reacting materials called cold cap, which is the determining factor for the glass production rate in Joule-heated air-bubbled nuclear waste glass melters. We consider the effects of bubbling rate, melt viscosity, melt thermal conductivity, conversion kinetics, and shear rate at the cold-cap bottom, and develop simple relationships for the cold-cap bottom temperature and glass production rate. We show that the melt convection enhances the heat transfer to the cold cap by suppressing the thermal boundary layer and primary foam, while the conversion kinetics opposes these effects. Additionally, we mention how dissolving silica particles affects the primary foam stability and discuss the limitations of the presented approach for vigorously foaming feeds.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"646 ","pages":"Article 123262"},"PeriodicalIF":3.2,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441000","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}
The performance of a lithium-ion battery (LIB) is largely contingent upon its anode material. At present, germanium-based anode materials are of interest due to their high theoretical capacity, but there are fewer studies on germanium-based glass anode materials. In this work, graphene mixed germanium-based glass composite material was fabricated utilizing the ball-milling technique. The addition of graphene greatly reduces the charge transfer resistance of the germanium-based glass anode during cycling. Meanwhile, the composite anode exhibited a high specific capacity of 1101.5 mAh g-1 during the first discharge cycle, and the discharge/charge specific capacity was still as high as 1108.2/1098.6 mAh g-1 after 450 cycles at a current density of 500 mA g-1. Moreover, at a high current of 2 A g-1, the composite anode still maintains a high discharge specific capacity of 437.2 mAh g-1, and there is no obvious swelling on the surface, showing excellent stability. It is hoped that the current research endeavor may offer a fresh direction for future studies aimed at optimizing germanium-based glass anode materials.
锂离子电池（LIB）的性能在很大程度上取决于其负极材料。目前，锗基负极材料因其理论容量高而备受关注，但有关锗基玻璃负极材料的研究较少。在这项工作中，利用球磨技术制造了石墨烯混合锗基玻璃复合材料。石墨烯的加入大大降低了锗基玻璃阳极在循环过程中的电荷转移电阻。同时，该复合阳极在第一个放电循环中表现出 1101.5 mAh g-1 的高比容量，在电流密度为 500 mA g-1 的条件下，放电/充电比容量在 450 个循环后仍高达 1108.2/1098.6 mAh g-1。此外，在 2 A g-1 的高电流下，复合阳极仍能保持 437.2 mAh g-1 的高放电比容量，且表面无明显膨胀，显示出极佳的稳定性。希望目前的研究工作能为今后优化锗基玻璃阳极材料的研究提供新的方向。
{"title":"Germanium based glass modified by graphene as anode material with high capacity for lithium-ion batteries","authors":"Siguang Feng, Xinlong Li, Chen Shang, Liangpeng Tang, Junjie Zhang","doi":"10.1016/j.jnoncrysol.2024.123257","DOIUrl":"10.1016/j.jnoncrysol.2024.123257","url":null,"abstract":"<div><div>The performance of a lithium-ion battery (LIB) is largely contingent upon its anode material. At present, germanium-based anode materials are of interest due to their high theoretical capacity, but there are fewer studies on germanium-based glass anode materials. In this work, graphene mixed germanium-based glass composite material was fabricated utilizing the ball-milling technique. The addition of graphene greatly reduces the charge transfer resistance of the germanium-based glass anode during cycling. Meanwhile, the composite anode exhibited a high specific capacity of 1101.5 mAh g<sup>-1</sup> during the first discharge cycle, and the discharge/charge specific capacity was still as high as 1108.2/1098.6 mAh g<sup>-1</sup> after 450 cycles at a current density of 500 mA g<sup>-1</sup>. Moreover, at a high current of 2 A g<sup>-1</sup>, the composite anode still maintains a high discharge specific capacity of 437.2 mAh g<sup>-1</sup>, and there is no obvious swelling on the surface, showing excellent stability. It is hoped that the current research endeavor may offer a fresh direction for future studies aimed at optimizing germanium-based glass anode materials.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"646 ","pages":"Article 123257"},"PeriodicalIF":3.2,"publicationDate":"2024-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142433313","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}
Pub Date : 2024-10-11DOI: 10.1016/j.jnoncrysol.2024.123254
Stefania Wolff , Sharafat Ali , Jakub Karczewski , Małgorzata Rutkowska , Hiroyo Segawa , Natalia Anna Wójcik
A set of fifteen calcium-phosphate-silicate glass samples, varying in alkali, magnesium, silicon, and nitrogen content, was prepared, and their structural, thermal, and in vitro dissolution properties were analyzed. Infrared spectroscopy showed a high degree of depolymerization of the silicate network consisting mainly of Q2 and Q3 units. Thermal analysis showed that the silicon content primarily affects both the glass transition temperature and the thermal stability of the glasses. In vitro dissolution studies were conducted both in static and dynamic modes in phosphate-buffered saline. Greater weight loss was observed for materials tested in the dynamic mode than in the static mode. Ion concentration profiles determined for PBS after immersing the glasses showed the release of sodium and calcium into solutions. Subsequent studies, conducted using scanning electron microscopy, X-ray diffraction, and infrared spectroscopy showed the formation of an amorphous or crystalline layer of calcium phosphates, most likely hydroxyapatite.
{"title":"Modifications of silicate bioglass synthesis and composition for in vitro dissolution control: Static and dynamic assessment","authors":"Stefania Wolff , Sharafat Ali , Jakub Karczewski , Małgorzata Rutkowska , Hiroyo Segawa , Natalia Anna Wójcik","doi":"10.1016/j.jnoncrysol.2024.123254","DOIUrl":"10.1016/j.jnoncrysol.2024.123254","url":null,"abstract":"<div><div>A set of fifteen calcium-phosphate-silicate glass samples, varying in alkali, magnesium, silicon, and nitrogen content, was prepared, and their structural, thermal, and <em>in vitro</em> dissolution properties were analyzed. Infrared spectroscopy showed a high degree of depolymerization of the silicate network consisting mainly of Q<sup>2</sup> and Q<sup>3</sup> units. Thermal analysis showed that the silicon content primarily affects both the glass transition temperature and the thermal stability of the glasses. <em>In vitro</em> dissolution studies were conducted both in static and dynamic modes in phosphate-buffered saline. Greater weight loss was observed for materials tested in the dynamic mode than in the static mode. Ion concentration profiles determined for PBS after immersing the glasses showed the release of sodium and calcium into solutions. Subsequent studies, conducted using scanning electron microscopy, X-ray diffraction, and infrared spectroscopy showed the formation of an amorphous or crystalline layer of calcium phosphates, most likely hydroxyapatite.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"646 ","pages":"Article 123254"},"PeriodicalIF":3.2,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424661","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}
Pub Date : 2024-10-11DOI: 10.1016/j.jnoncrysol.2024.123253
Renze Xu , Zhen Wang , Haichuan Xu
The effects of Cr2O3 on viscosities and structure evolutions of SiO2-CaO-3wt%MgO-10wt%Fe2O3–10wt%Al2O3-(1–5wt%)Cr2O3 coal slags were investigated in this work. The viscosity of the coal slag decreased with increasing the Cr2O3 content in coal slags. The role of Cr2O3 in present systems was clarified. Cr2O3 was a basic oxide in the coal slags, and Cr3+mainly entered into the slag structures as the form of CrO6 units to occupy the octahedral positions, which could depolymerize the complex structures. With the addition of Cr2O3 into coal slags, the mole ratio of O2- and O- raised while the mole fraction of O0 declined, suggesting Cr2O3 simplified the whole structure of the coal slags and adding Cr2O3 to the present slags could lead to a lower viscosity. The variations of slag viscosities were consistent with the change tendencies of structures analyzed by Raman spectra, 27Al NMR and O1s XPS.
{"title":"Viscosities and structures of SiO2-CaO-3wt%MgO-10wt%Fe2O3-10wt%Al2O3-Cr2O3 coal slags","authors":"Renze Xu , Zhen Wang , Haichuan Xu","doi":"10.1016/j.jnoncrysol.2024.123253","DOIUrl":"10.1016/j.jnoncrysol.2024.123253","url":null,"abstract":"<div><div>The effects of Cr<sub>2</sub>O<sub>3</sub> on viscosities and structure evolutions of SiO<sub>2</sub>-CaO-3wt%MgO-10wt%Fe<sub>2</sub>O<sub>3</sub>–10wt%Al<sub>2</sub>O<sub>3</sub>-(1–5wt%)Cr<sub>2</sub>O<sub>3</sub> coal slags were investigated in this work. The viscosity of the coal slag decreased with increasing the Cr<sub>2</sub>O<sub>3</sub> content in coal slags. The role of Cr<sub>2</sub>O<sub>3</sub> in present systems was clarified. Cr<sub>2</sub>O<sub>3</sub> was a basic oxide in the coal slags, and Cr<sup>3+</sup>mainly entered into the slag structures as the form of CrO<sub>6</sub> units to occupy the octahedral positions, which could depolymerize the complex structures. With the addition of Cr<sub>2</sub>O<sub>3</sub> into coal slags, the mole ratio of O<sup>2-</sup> and O<sup>-</sup> raised while the mole fraction of O<sup>0</sup> declined, suggesting Cr<sub>2</sub>O<sub>3</sub> simplified the whole structure of the coal slags and adding Cr<sub>2</sub>O<sub>3</sub> to the present slags could lead to a lower viscosity. The variations of slag viscosities were consistent with the change tendencies of structures analyzed by Raman spectra, <sup>27</sup>Al NMR and O<sub>1s</sub> XPS.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"646 ","pages":"Article 123253"},"PeriodicalIF":3.2,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424662","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}
Pub Date : 2024-10-11DOI: 10.1016/j.jnoncrysol.2024.123259
J. Jiang , H.J. Sun , W.H. Zhou , Z.B. Wang , J. Sun , Y. Li
Enthalpy relaxation rejuvenation is a recently developed promising method for modulating mechanical properties of metallic glasses (MGs), but its effect on corrosion resistance, which is important for applications of MGs, has never been studied before. This paper studies its effects on microstructure and corrosion of a Zr52.5Cu17.9Ni14.6Al10Ti5 bulk metallic glasses (BMGs) in 3.5 wt% NaCl solution. The results show that the system energy increases after rejuvenation, but the content of local ordering structure, which results in chemical inhomogeneity, is almost changeless, as compared to the structure-relaxed state. The enthalpy relaxation rejuvenation has minimal effects on passivation and pitting corrosion of structure-relaxed samples, with no apparent adverse effects. Since pitting corrosion of Zr52.5Cu17.9Ni14.6Al10Ti5 BMGs is dominated by pit initiation and chemical inhomogeneity could initiate pitting corrosion, this minimal effect is attributed to the nearly unchanged chemical inhomogeneity of rejuvenated samples. This finding provides valuable information for industrial applications of Zr-based BMGs.
{"title":"Effect of enthalpy relaxation rejuvenation on microstructure and corrosion resistance of a Zr-based bulk metallic glass","authors":"J. Jiang , H.J. Sun , W.H. Zhou , Z.B. Wang , J. Sun , Y. Li","doi":"10.1016/j.jnoncrysol.2024.123259","DOIUrl":"10.1016/j.jnoncrysol.2024.123259","url":null,"abstract":"<div><div>Enthalpy relaxation rejuvenation is a recently developed promising method for modulating mechanical properties of metallic glasses (MGs), but its effect on corrosion resistance, which is important for applications of MGs, has never been studied before. This paper studies its effects on microstructure and corrosion of a Zr<sub>52.5</sub>Cu<sub>17.9</sub>Ni<sub>14.6</sub>Al<sub>10</sub>Ti<sub>5</sub> bulk metallic glasses (BMGs) in 3.5 wt% NaCl solution. The results show that the system energy increases after rejuvenation, but the content of local ordering structure, which results in chemical inhomogeneity, is almost changeless, as compared to the structure-relaxed state. The enthalpy relaxation rejuvenation has minimal effects on passivation and pitting corrosion of structure-relaxed samples, with no apparent adverse effects. Since pitting corrosion of Zr<sub>52.5</sub>Cu<sub>17.9</sub>Ni<sub>14.6</sub>Al<sub>10</sub>Ti<sub>5</sub> BMGs is dominated by pit initiation and chemical inhomogeneity could initiate pitting corrosion, this minimal effect is attributed to the nearly unchanged chemical inhomogeneity of rejuvenated samples. This finding provides valuable information for industrial applications of Zr-based BMGs.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"646 ","pages":"Article 123259"},"PeriodicalIF":3.2,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424799","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}
To design ultralight nanocomposite aerogels with good compatibility of different components, excellent thermostability, flame retardancy and strength is an urgent issue to be addressed. In this work, we fabricated a lightweight, compressible aramid nanofiber/silicon dioxide (ANF/SiO2) composite aerogel by sol-gel method. The homogeneous SiO2 knots were formed in-situ among the nanofibers resulting a semi-interpenetrating network structure. Due to the supporting effect of the ANF on the overall skeleton and the inhibiting effect of SiO2 the compression properties of the ANF/SiO2 aerogels were significantly improved. In addition, the aerogel shows low thermal conductivity, excellent thermal stability and flame retardancy meanwhile advanced self-extinguishing properties even after two minutes combustion. The design does not rely on any toxic or corrosive substances and provides a new insight into the preparation of composite aerogels with green, compressibility, thermal insulation and excellent flame retardancy.
{"title":"Semi-interpenetrating networks of ANF/SiO2 composite aerogel with lightweight, compressible, and excellent flame retardancy properties","authors":"Xiaotong Zheng, Fuhai Guo, Yuanyuan Liu, Guangli Hu, Qingfu Wang, Minghan Xu","doi":"10.1016/j.jnoncrysol.2024.123256","DOIUrl":"10.1016/j.jnoncrysol.2024.123256","url":null,"abstract":"<div><div>To design ultralight nanocomposite aerogels with good compatibility of different components, excellent thermostability, flame retardancy and strength is an urgent issue to be addressed. In this work, we fabricated a lightweight, compressible aramid nanofiber/silicon dioxide (ANF/SiO<sub>2</sub>) composite aerogel by sol-gel method. The homogeneous SiO<sub>2</sub> knots were formed in-situ among the nanofibers resulting a semi-interpenetrating network structure. Due to the supporting effect of the ANF on the overall skeleton and the inhibiting effect of SiO<sub>2</sub> the compression properties of the ANF/SiO<sub>2</sub> aerogels were significantly improved. In addition, the aerogel shows low thermal conductivity, excellent thermal stability and flame retardancy meanwhile advanced self-extinguishing properties even after two minutes combustion. The design does not rely on any toxic or corrosive substances and provides a new insight into the preparation of composite aerogels with green, compressibility, thermal insulation and excellent flame retardancy.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"646 ","pages":"Article 123256"},"PeriodicalIF":3.2,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424659","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}
Pub Date : 2024-10-08DOI: 10.1016/j.jnoncrysol.2024.123238
Yutian Cao , Tianci Ou , Haoxiang Xue , Fan Yang , Chunting Wang , Junhua Li , Qian Zhou , Liang Chen , Kaihong Fang , Peng Lv
We investigated the ion-irradiation effects of iron phosphate glasses (IPGs) with composition of 40Fe2O3‒60P2O5 (mol%) and 10B2O3‒36Fe2O3‒54P2O5 (mol%), respectively, and explored the effect of boron doping on the mechanical properties and the chemical stability. Mono-ion irradiation (5-MeV Xe20+) and sequential irradiation scenario (5-MeV Xe20++ 250-keV H+) were performed with different doses. As the Xe-dose increased, both the hardness and the Young's modulus decreased until converging to saturation, and then the hardness tended to recover. The variations in mechanical properties and water contact angle of the 10B2O3‒36Fe2O3‒54P2O5 were more significant than those of the 40Fe2O3‒60P2O5, indicating inferior irradiation resistance. The hardness recovery was also observed in H-ion irradiation whose energy deposition is predominated by electronic interaction, while the boron doping weakened this phenomenon. Our study contributes to understanding the long-term behavior of IPG during the underground disposal of high-level waste, and provides fundamental data to optimize the design of IPG formulations.
{"title":"Effect of boron doping on the irradiation resistance of iron phosphate glass: Insights from mechanical properties and chemical stability","authors":"Yutian Cao , Tianci Ou , Haoxiang Xue , Fan Yang , Chunting Wang , Junhua Li , Qian Zhou , Liang Chen , Kaihong Fang , Peng Lv","doi":"10.1016/j.jnoncrysol.2024.123238","DOIUrl":"10.1016/j.jnoncrysol.2024.123238","url":null,"abstract":"<div><div>We investigated the ion-irradiation effects of iron phosphate glasses (IPGs) with composition of 40Fe<sub>2</sub>O<sub>3</sub>‒60P<sub>2</sub>O<sub>5</sub> (mol%) and 10B<sub>2</sub>O<sub>3</sub>‒36Fe<sub>2</sub>O<sub>3</sub>‒54P<sub>2</sub>O<sub>5</sub> (mol%), respectively, and explored the effect of boron doping on the mechanical properties and the chemical stability. Mono-ion irradiation (5-MeV Xe<sup>20+</sup>) and sequential irradiation scenario (5-MeV Xe<sup>20+</sup>+ 250-keV H<sup>+</sup>) were performed with different doses. As the Xe-dose increased, both the hardness and the Young's modulus decreased until converging to saturation, and then the hardness tended to recover. The variations in mechanical properties and water contact angle of the 10B<sub>2</sub>O<sub>3</sub>‒36Fe<sub>2</sub>O<sub>3</sub>‒54P<sub>2</sub>O<sub>5</sub> were more significant than those of the 40Fe<sub>2</sub>O<sub>3</sub>‒60P<sub>2</sub>O<sub>5</sub>, indicating inferior irradiation resistance. The hardness recovery was also observed in H-ion irradiation whose energy deposition is predominated by electronic interaction, while the boron doping weakened this phenomenon. Our study contributes to understanding the long-term behavior of IPG during the underground disposal of high-level waste, and provides fundamental data to optimize the design of IPG formulations.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"646 ","pages":"Article 123238"},"PeriodicalIF":3.2,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424733","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}
The influence of the gradual replacement of Al2O3 with Y2O3 in alkali-containing silica glass sealants is studied with a detailed discussion of crystallization kinetics. Such substitution has a complex effect on Tg, Tsphere, THS, and Tflowing which might be connected with the role of yttrium in the glass network. An increase in the Y2O3 content is found to intensify crystallization, causing the growth of the crystalline phase fraction. At the same time, intense crystallization appears to have no pronounced effect on the coefficient of thermal expansion: its average increment after 1000 h of exposure at 850 °C in air atmosphere is <1‧10−6K−1. The only crystalline phase observed in samples with Y2O3 content greater than 2 wt % is suggested to be Na0.8Ca0.3Y0.4Zr0.22Si2.13O6 which is the Ca2+- and Zr4+-substituted isomorph of NaYSi2O6.
{"title":"Thermal behavior and crystallization of alkali aluminosilicate sealants for SOFC: Effect of Al2O3 to Y2O3 substitution","authors":"D.Yu. Dubovtsev , A.I. Vepreva , D.V. Boldyrev , N.S. Saetova , A.V. Kuzmin","doi":"10.1016/j.jnoncrysol.2024.123255","DOIUrl":"10.1016/j.jnoncrysol.2024.123255","url":null,"abstract":"<div><div>The influence of the gradual replacement of Al<sub>2</sub>O<sub>3</sub> with Y<sub>2</sub>O<sub>3</sub> in alkali-containing silica glass sealants is studied with a detailed discussion of crystallization kinetics. Such substitution has a complex effect on <em>T</em><sub>g</sub>, <em>T</em><sub>sphere</sub>, <em>T</em><sub>HS</sub>, and <em>T</em><sub>flowing</sub> which might be connected with the role of yttrium in the glass network. An increase in the Y<sub>2</sub>O<sub>3</sub> content is found to intensify crystallization, causing the growth of the crystalline phase fraction. At the same time, intense crystallization appears to have no pronounced effect on the coefficient of thermal expansion: its average increment after 1000 h of exposure at 850 °C in air atmosphere is <1‧10<sup>−6</sup> <em>K</em><sup>−1</sup>. The only crystalline phase observed in samples with Y<sub>2</sub>O<sub>3</sub> content greater than 2 wt % is suggested to be Na<sub>0.8</sub>Ca<sub>0.3</sub>Y<sub>0.4</sub>Zr<sub>0.22</sub>Si<sub>2.13</sub>O<sub>6</sub> which is the Ca<sup>2</sup><sup>+</sup>- and Zr<sup>4+</sup>-substituted isomorph of NaYSi<sub>2</sub>O<sub>6</sub>.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"646 ","pages":"Article 123255"},"PeriodicalIF":3.2,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424660","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}
We synthesized BaO-Bi2O3-P2O5 glass samples with different Nd concentrations by the melt-quenching technique. The concentrations were 1.0, 5.0, 10, 15, and 20 %. We obtained transparent and homogeneous samples for 1.0–10 % Nd concentrations. The 15 % Nd-doped sample was inhomogeneous, and the 20 % Nd-doped sample contained a crystalline phase. The photoluminescence (PL) and scintillation properties of the 1.0–10 % Nd-doped samples were investigated. The samples showed PL and scintillation peaks in the near-infrared region, which were due to 4f–4f transitions of Nd3+. We tested the X-ray dose rate response functions of the samples. The 10 % Nd-doped samples showed the most intensive response among the examined samples, and the lower detection limit of dose rate was 0.06 Gy/h with our setup.
{"title":"Near‐infrared scintillation properties of Nd-doped BaO-Bi2O3-P2O5 glasses","authors":"Keita Miyajima, Akihiro Nishikawa, Takumi Kato, Daisuke Nakauchi, Noriaki Kawaguchi, Takayuki Yanagida","doi":"10.1016/j.jnoncrysol.2024.123247","DOIUrl":"10.1016/j.jnoncrysol.2024.123247","url":null,"abstract":"<div><div>We synthesized BaO-Bi<sub>2</sub>O<sub>3</sub>-P<sub>2</sub>O<sub>5</sub> glass samples with different Nd concentrations by the melt-quenching technique. The concentrations were 1.0, 5.0, 10, 15, and 20 %. We obtained transparent and homogeneous samples for 1.0–10 % Nd concentrations. The 15 % Nd-doped sample was inhomogeneous, and the 20 % Nd-doped sample contained a crystalline phase. The photoluminescence (PL) and scintillation properties of the 1.0–10 % Nd-doped samples were investigated. The samples showed PL and scintillation peaks in the near-infrared region, which were due to 4f–4f transitions of Nd<sup>3+</sup>. We tested the X-ray dose rate response functions of the samples. The 10 % Nd-doped samples showed the most intensive response among the examined samples, and the lower detection limit of dose rate was 0.06 Gy/h with our setup.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"646 ","pages":"Article 123247"},"PeriodicalIF":3.2,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424656","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}
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