Pub Date : 2024-10-31DOI: 10.1016/j.jnoncrysol.2024.123277
Jili Jia, Lingxiang Shi, You Wu, Ranbin Wang, Wenhui Guo, Yang Shao, Na Chen, Kefu Yao
In this work, the effects of Sn, Bi and In microalloying elements on the magnetic properties and microstructure of Fe83.1-x-y-zB9.25C3Si3P0.9Cu0.75SnxBiyInz (x, y, z = 0∼0.2) nanocrystalline alloys were investigated. It shows the microaddition of Bi and In could facilitate the formation of α-Fe nanocrystals and reduce the growth activation energy, due to their positive mixing enthalpies (ΔHmix) with Fe and rapid diffusion of their atoms. The promoting effects of In and Bi (especially In) addition on α-Fe precipitation increased the crystallization volume fraction (vcr) and thus enhanced the magnetic flux density (Bs) of nanocrystalline alloys. Compared with Fe83.1B9.25C3Si3P0.9Cu0.75 nanocrystalline alloy, the Bs of Fe83B9.25C3Si3P0.9Cu0.75Bi0.1, Fe83B9.25C3Si3P0.9Cu0.75In0.1, and Fe82.9B9.25C3Si3P0.9Cu0.75Bi0.1In0.1 alloys, annealed with same method, increased from 1.810 T to 1.831 T, 1.837 T and 1.849 T, respectively, together with relatively low coercivity (Hc). The present results indicate that microaddtion of low melting point element possessing positive mixing enthalpies with Fe could significantly improve the magnetic properties of the nanocrystalline alloys, which possess great potentials of application in high frequency electronic apparatus. It offered a new approach for design high performance soft magnetic nanocrysalline alloys.
本文研究了 Sn、Bi 和 In 微合金元素对 Fe83.1-x-y-zB9.25C3Si3P0.9Cu0.75SnxBiyInz (x, y, z = 0∼0.2) 纳米晶合金磁性能和微观结构的影响。结果表明，由于 Bi 和 In 与铁的正混合焓（ΔHmix）及其原子的快速扩散，微量添加 Bi 和 In 可促进α-铁纳米晶体的形成并降低生长活化能。In 和 Bi（尤其是 In）的加入对 α-Fe 沉淀的促进作用增加了结晶体积分数 (vcr)，从而提高了纳米晶合金的磁通密度 (Bs)。与 Fe83.1B9.25C3Si3P0.9Cu0.75 纳米晶合金相比，Fe83B9.25C3Si3P0.9Cu0.75Bi0.1、Fe83B9.25C3Si3P0.9Cu0.75In0.1 和 Fe82.9B9.25C3Si3P0.9Cu0.本研究结果表明，微量添加与铁具有正混合焓的低熔点元素可显著改善纳米晶合金的磁性能，这在高频电子仪器中具有巨大的应用潜力。这为设计高性能软磁纳米晶合金提供了一种新方法。
{"title":"Effect of Sn, Bi and In on the magnetic properties and microstructure of Fe-B-C-Si-P-Cu-M nanocrystalline alloys","authors":"Jili Jia, Lingxiang Shi, You Wu, Ranbin Wang, Wenhui Guo, Yang Shao, Na Chen, Kefu Yao","doi":"10.1016/j.jnoncrysol.2024.123277","DOIUrl":"10.1016/j.jnoncrysol.2024.123277","url":null,"abstract":"<div><div>In this work, the effects of Sn, Bi and In microalloying elements on the magnetic properties and microstructure of Fe<sub>83.1-x-y-z</sub>B<sub>9.25</sub>C<sub>3</sub>Si<sub>3</sub>P<sub>0.9</sub>Cu<sub>0.75</sub>Sn<sub>x</sub>Bi<sub>y</sub>In<sub>z</sub> (<em>x, y, z</em> = 0∼0.2) nanocrystalline alloys were investigated. It shows the microaddition of Bi and In could facilitate the formation of α-Fe nanocrystals and reduce the growth activation energy, due to their positive mixing enthalpies (Δ<em>H<sub>mix</sub></em>) with Fe and rapid diffusion of their atoms. The promoting effects of In and Bi (especially In) addition on α-Fe precipitation increased the crystallization volume fraction (<em>v<sub>cr</sub></em>) and thus enhanced the magnetic flux density (<em>B<sub>s</sub></em>) of nanocrystalline alloys. Compared with Fe<sub>83.1</sub>B<sub>9.25</sub>C<sub>3</sub>Si<sub>3</sub>P<sub>0.9</sub>Cu<sub>0.75</sub> nanocrystalline alloy, the <em>B<sub>s</sub></em> of Fe<sub>83</sub>B<sub>9.25</sub>C<sub>3</sub>Si<sub>3</sub>P<sub>0.9</sub>Cu<sub>0.75</sub>Bi<sub>0.1</sub>, Fe<sub>83</sub>B<sub>9.25</sub>C<sub>3</sub>Si<sub>3</sub>P<sub>0.9</sub>Cu<sub>0.75</sub>In<sub>0.1</sub>, and Fe<sub>82.9</sub>B<sub>9.25</sub>C<sub>3</sub>Si<sub>3</sub>P<sub>0.9</sub>Cu<sub>0.75</sub>Bi<sub>0.1</sub>In<sub>0.1</sub> alloys, annealed with same method, increased from 1.810 T to 1.831 T, 1.837 T and 1.849 T, respectively, together with relatively low coercivity (<em>H<sub>c</sub></em>). The present results indicate that microaddtion of low melting point element possessing positive mixing enthalpies with Fe could significantly improve the magnetic properties of the nanocrystalline alloys, which possess great potentials of application in high frequency electronic apparatus. It offered a new approach for design high performance soft magnetic nanocrysalline alloys.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"647 ","pages":"Article 123277"},"PeriodicalIF":3.2,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142561421","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 : 2024-10-30DOI: 10.1016/j.jnoncrysol.2024.123276
Gaurav Gupta , El Mehdi Ghardi , Michael J.D. Rushton , Paul A. Bingham
This study measured and simulated continuous wave X-band electron paramagnetic resonance (cw-EPR) spectra of γ-irradiated (nuclear decay of 60Co) at 300 K soda-lime-silicate (SLS) glass to analyze the effects on Fe3+ ions from Fe2O3 impurities. Three radiation-induced hole-center paramagnetic defects were identified, though simulating the broad electron-center signals was challenging. A prominent Fe3+ resonance line (g∼ 4.28) was simulated using a rhombic spin Hamiltonian, and γ-irradiation caused a shift in the Fe3+gisovalue. While the axial zero-field-splitting (ZFS) parameter (D) remained stable, the rhombic ZFS parameter (E) decreased with increasing radiation, increasing rhombicity (λ= |E/D|). This suggests that radiation-induced defects distort the Fe3+ sites' electronic environment in the glass network. In summary, the study reveals the local structural evolution of radiation-induced defects in SLS glass and the local structure of Fe3+ impurities under γ-irradiation.
{"title":"Local structure analysis of γ-radiation-induced defects and Fe3+ impurities in soda-lime-silica: X-band EPR simulation","authors":"Gaurav Gupta , El Mehdi Ghardi , Michael J.D. Rushton , Paul A. Bingham","doi":"10.1016/j.jnoncrysol.2024.123276","DOIUrl":"10.1016/j.jnoncrysol.2024.123276","url":null,"abstract":"<div><div>This study measured and simulated continuous wave X-band electron paramagnetic resonance (<em>cw</em>-EPR) spectra of γ-irradiated (nuclear decay of <sup>60</sup>Co) at 300 K soda-lime-silicate (SLS) glass to analyze the effects on Fe<sup>3+</sup> ions from Fe<sub>2</sub>O<sub>3</sub> impurities. Three radiation-induced hole-center paramagnetic defects were identified, though simulating the broad electron-center signals was challenging. A prominent Fe<sup>3+</sup> resonance line (<em>g</em>∼ 4.28) was simulated using a rhombic spin Hamiltonian, and γ-irradiation caused a shift in the Fe<sup>3+</sup> <em>g</em><sub>iso</sub>value. While the axial <em>zero-field-splitting</em> (ZFS) parameter (<em>D</em>) remained stable, the rhombic ZFS parameter (<em>E</em>) decreased with increasing radiation, increasing rhombicity (<em>λ</em>= |<em>E</em>/<em>D</em>|). This suggests that radiation-induced defects distort the Fe<sup>3+</sup> sites' electronic environment in the glass network. In summary, the study reveals the local structural evolution of radiation-induced defects in SLS glass and the local structure of Fe<sup>3+</sup> impurities under γ-irradiation.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"647 ","pages":"Article 123276"},"PeriodicalIF":3.2,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553148","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}
Pub Date : 2024-10-30DOI: 10.1016/j.jnoncrysol.2024.123269
Zhaotian Wang , Xin Liu , Hongjie Luo , Lu Zhang , Hao Jiang
This work conducted a semi-quantitative analysis of structural variations in the surfaces and interiors of basalt fibers at 300 °C∼360 °C using X-ray photoelectron spectrometry. The proportions of non-bridging oxygen (NBO) of fiber surfaces are significantly higher than those in the interiors, due to the surface oxidation that occurs during the fiber manufacturing process. After heat treatment, the NBO contents of the interiors significantly exceeded those of the surfaces, indicating that the oxidation of the fibers is intrinsic and independent of environmental oxygen. Tensile tests showed that the structural variation of the fiber interior affects the fiber modulus, while that of the surface affects the growth of surface flaws, which manifests as the reduction of breaking elongation. This study presents an analytical method that contributes to a deeper understanding of the mechanisms underlying the mechanical degradation of those basaltic fibers at elevated temperatures.
这项研究利用 X 射线光电子能谱仪对 300 °C∼360 °C 下玄武岩纤维表面和内部的结构变化进行了半定量分析。由于纤维在制造过程中会发生表面氧化，因此纤维表面的非桥接氧（NBO）比例明显高于内部。热处理后，内部的非桥接氧含量明显超过表面，这表明纤维的氧化是内在的，与环境中的氧气无关。拉伸试验表明，纤维内部的结构变化会影响纤维模量，而表面的结构变化则会影响表面缺陷的增长，表现为断裂伸长率的降低。这项研究提出了一种分析方法，有助于更深入地了解这些玄武岩纤维在高温下机械降解的内在机理。
{"title":"Mechanical degradation of basalt fiber at elevated temperatures (300∼360 °C) studied through semi-quantitative analysis of X-ray photoelectron spectrometry","authors":"Zhaotian Wang , Xin Liu , Hongjie Luo , Lu Zhang , Hao Jiang","doi":"10.1016/j.jnoncrysol.2024.123269","DOIUrl":"10.1016/j.jnoncrysol.2024.123269","url":null,"abstract":"<div><div>This work conducted a semi-quantitative analysis of structural variations in the surfaces and interiors of basalt fibers at 300 °C∼360 °C using X-ray photoelectron spectrometry. The proportions of non-bridging oxygen (NBO) of fiber surfaces are significantly higher than those in the interiors, due to the surface oxidation that occurs during the fiber manufacturing process. After heat treatment, the NBO contents of the interiors significantly exceeded those of the surfaces, indicating that the oxidation of the fibers is intrinsic and independent of environmental oxygen. Tensile tests showed that the structural variation of the fiber interior affects the fiber modulus, while that of the surface affects the growth of surface flaws, which manifests as the reduction of breaking elongation. This study presents an analytical method that contributes to a deeper understanding of the mechanisms underlying the mechanical degradation of those basaltic fibers at elevated temperatures.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"647 ","pages":"Article 123269"},"PeriodicalIF":3.2,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553147","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}
Tb3+-Sm3+ co-doped glass ceramics containing Sr5F(PO4)3 phase were synthesized using the melting-curing-crystallization method. The best heat treatment condition for glass ceramics was determined to be at 750 °C for 1.5 h through the use of differential scanning calorimetry (DSC), X-ray diffraction (XRD), and transmittance curve analysis. With the Judd-Ofelt theory, the Judd-Ofelt strength parameters Ωλ (λ=2,4,6) for precursor glasses and glass ceramics were calculated. Fluorescence spectroscopy was used to study the optical properties of Tb3+-Sm3+ co-doped containing Sr5F(PO4)3 glass ceramics. The results demonstrated a significant enhancement in the luminescence performance of Sr5F(PO4)3 crystalline glass ceramics compared to the precursor glass. Fluorescence lifetimes and Dexter's theory demonstrate energy transfer from Tb3+ to Sm3+. The luminescent color of glass ceramics can be altered by varying the concentration of Sm3+ doping. The Tb3+-Sm3+ co-doped Sr5F(PO4)3 phase glass ceramics exhibit promising potential for application in the field of W-LEDs.
{"title":"Luminescence properties and Judd-Ofelt theory analysis of Tb3+-Sm3+ co-doped glass ceramics containing Sr5F(PO4)3","authors":"Dandan Li, Xiaoxu Zhang, Yihan Cheng, Rong Wang, Shuting Zhao, Zhiqian Lv, Qianwen Wang, Yuxin Zhang, Yuchun Wan, Xiangyu Zou, Hongbo Zhang","doi":"10.1016/j.jnoncrysol.2024.123280","DOIUrl":"10.1016/j.jnoncrysol.2024.123280","url":null,"abstract":"<div><div>Tb<sup>3+</sup>-Sm<sup>3+</sup> co-doped glass ceramics containing Sr<sub>5</sub>F(PO<sub>4</sub>)<sub>3</sub> phase were synthesized using the melting-curing-crystallization method. The best heat treatment condition for glass ceramics was determined to be at 750 °C for 1.5 h through the use of differential scanning calorimetry (DSC), X-ray diffraction (XRD), and transmittance curve analysis. With the Judd-Ofelt theory, the Judd-Ofelt strength parameters Ω<sub>λ</sub> (λ=2,4,6) for precursor glasses and glass ceramics were calculated. Fluorescence spectroscopy was used to study the optical properties of Tb<sup>3+</sup>-Sm<sup>3+</sup> co-doped containing Sr<sub>5</sub>F(PO<sub>4</sub>)<sub>3</sub> glass ceramics. The results demonstrated a significant enhancement in the luminescence performance of Sr<sub>5</sub>F(PO<sub>4</sub>)<sub>3</sub> crystalline glass ceramics compared to the precursor glass. Fluorescence lifetimes and Dexter's theory demonstrate energy transfer from Tb<sup>3+</sup> to Sm<sup>3+</sup>. The luminescent color of glass ceramics can be altered by varying the concentration of Sm<sup>3+</sup> doping. The Tb<sup>3+</sup>-Sm<sup>3+</sup> co-doped Sr<sub>5</sub>F(PO<sub>4</sub>)<sub>3</sub> phase glass ceramics exhibit promising potential for application in the field of W-LEDs.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"647 ","pages":"Article 123280"},"PeriodicalIF":3.2,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553146","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 : 2024-10-30DOI: 10.1016/j.jnoncrysol.2024.123272
Elchin M. Huseynov , Tural G. Naghiyev
The DSC spectra and Gibbs free energy of non-crystalline nano Si3N4 particles were investigated in the temperature range of -100÷500 °C. All analyzes were comparatively performed before and after neutron irradiation. Simultaneously, all thermophysical parameters were considered separately in both heating and cooling processes. The heat flow in Si3N4 nanoparticles was investigated as a function of temperature. The influence of the neutron flux on the Gibbs free energy was comparatively investigated at low temperatures. The effect of neutron transmutations and supercooling on heat transport processes in Si3N4 nanoparticles has been studied.
{"title":"Low temperature DSC investigation of neutron irradiated non-crystalline Si3N4 nanoparticles","authors":"Elchin M. Huseynov , Tural G. Naghiyev","doi":"10.1016/j.jnoncrysol.2024.123272","DOIUrl":"10.1016/j.jnoncrysol.2024.123272","url":null,"abstract":"<div><div>The DSC spectra and Gibbs free energy of non-crystalline nano Si<sub>3</sub>N<sub>4</sub> particles were investigated in the temperature range of -100÷500 °C. All analyzes were comparatively performed before and after neutron irradiation. Simultaneously, all thermophysical parameters were considered separately in both heating and cooling processes. The heat flow in Si<sub>3</sub>N<sub>4</sub> nanoparticles was investigated as a function of temperature. The influence of the neutron flux on the Gibbs free energy was comparatively investigated at low temperatures. The effect of neutron transmutations and supercooling on heat transport processes in Si<sub>3</sub>N<sub>4</sub> nanoparticles has been studied.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"647 ","pages":"Article 123272"},"PeriodicalIF":3.2,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553149","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}
Single-phase Bi2MO6 (M=Mo, W) glass-ceramics with photocatalytic activity were obtained by one-step heat treatment of the 51B2O3–24Li2O-7ZnO-2P2O5–1Al2O3–5Bi2O3–10MoO3/WO3 parent glasses. The thermal behaviour, phase composition, micromorphology, and network structure of the glasses were investigated, and it was observed that the crystal structure, crystallinity, and microscopic morphology of the glass-ceramics have a significant effect on the photocatalytic activity. XRD and SEM results confirm the precipitation of the monoclinic Bi2MoO6 and orthorhombic Bi2WO6 crystals, which are nano-spherical and 3D dumbbell-like structures, respectively. The prepared glass-ceramics exhibit a strong absorption in the UV–Vis region. The photocatalytic activity of the Bi2MO6 (M=Mo, W) glass-ceramic powders is evaluated by methylene blue dye under UV irradiation. Under the same conditions, the Bi2WO6 glass-ceramic powders exhibit a higher photocatalytic activity than the Bi2MoO6 glass-ceramic powders. The Bi2WO6 glass-ceramic powders achieve a 73% degradation of methylene blue dye after 150 min of irradiation. The difference in photocatalytic activity is mainly related to the crystal structure, crystallinity, and micromorphology of the glass-ceramics. The prepared Bi2WO6 glass-ceramic can be used as a photocatalyst for wastewater treatment.
{"title":"Preparation and photocatalytic properties of single-phase Bi2MO6 (M=Mo, W) glass-ceramics","authors":"Longqing He, Haozhang Liang, Nanshan Ma, Tingxiao Wu, Zhiwei Luo, Anxian Lu","doi":"10.1016/j.jnoncrysol.2024.123281","DOIUrl":"10.1016/j.jnoncrysol.2024.123281","url":null,"abstract":"<div><div>Single-phase Bi<sub>2</sub>MO<sub>6</sub> (M=Mo, W) glass-ceramics with photocatalytic activity were obtained by one-step heat treatment of the 51B<sub>2</sub>O<sub>3</sub>–24Li<sub>2</sub>O-7ZnO-2P<sub>2</sub>O<sub>5</sub>–1Al<sub>2</sub>O<sub>3</sub>–5Bi<sub>2</sub>O<sub>3</sub>–10MoO<sub>3</sub>/WO<sub>3</sub> parent glasses. The thermal behaviour, phase composition, micromorphology, and network structure of the glasses were investigated, and it was observed that the crystal structure, crystallinity, and microscopic morphology of the glass-ceramics have a significant effect on the photocatalytic activity. XRD and SEM results confirm the precipitation of the monoclinic Bi<sub>2</sub>MoO<sub>6</sub> and orthorhombic Bi<sub>2</sub>WO<sub>6</sub> crystals, which are nano-spherical and 3D dumbbell-like structures, respectively. The prepared glass-ceramics exhibit a strong absorption in the UV–Vis region. The photocatalytic activity of the Bi<sub>2</sub>MO<sub>6</sub> (M=Mo, W) glass-ceramic powders is evaluated by methylene blue dye under UV irradiation. Under the same conditions, the Bi<sub>2</sub>WO<sub>6</sub> glass-ceramic powders exhibit a higher photocatalytic activity than the Bi<sub>2</sub>MoO<sub>6</sub> glass-ceramic powders. The Bi<sub>2</sub>WO<sub>6</sub> glass-ceramic powders achieve a 73% degradation of methylene blue dye after 150 min of irradiation. The difference in photocatalytic activity is mainly related to the crystal structure, crystallinity, and micromorphology of the glass-ceramics. The prepared Bi<sub>2</sub>WO<sub>6</sub> glass-ceramic can be used as a photocatalyst for wastewater treatment.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"647 ","pages":"Article 123281"},"PeriodicalIF":3.2,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539209","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 slag is rich in reactive aluminosilicate components and can be combined with alkali solution to form a three-dimensional binder. However, the inherently heterogeneous nature of slag presents challenges to the standardization of alkali-activated product. The fundamental objective of this work is to understand differences of characteristics between slags obtained from different sources within China, including physical properties, chemical composition, microstructure, elemental distribution, mineral phases, chemical bonding, glass contents, together with the microstructures of glassy phase. A novel reactivity index concept to evaluate slag used in alkali activated materials was proposed using seven typical slags in China and validated it against nine data from literature, confirming its considerable effectiveness and usefulness in reactivity evaluations. The positive correlations were found between the reactivity index of slag and the strengths of alkaline-activated pastes prepared by different methods and this index optimizes the process of raw waste selection.
{"title":"Developing an indexing methodology for estimating the reactivity of slag from different sources use in alkali-activated materials","authors":"Ke-yu Chen , Chao Miao , Guang-hua Lyu , Ke-xian Wu , Jie-jing Chen , Jin Xia","doi":"10.1016/j.jnoncrysol.2024.123278","DOIUrl":"10.1016/j.jnoncrysol.2024.123278","url":null,"abstract":"<div><div>The slag is rich in reactive aluminosilicate components and can be combined with alkali solution to form a three-dimensional binder. However, the inherently heterogeneous nature of slag presents challenges to the standardization of alkali-activated product. The fundamental objective of this work is to understand differences of characteristics between slags obtained from different sources within China, including physical properties, chemical composition, microstructure, elemental distribution, mineral phases, chemical bonding, glass contents, together with the microstructures of glassy phase. A novel reactivity index concept to evaluate slag used in alkali activated materials was proposed using seven typical slags in China and validated it against nine data from literature, confirming its considerable effectiveness and usefulness in reactivity evaluations. The positive correlations were found between the reactivity index of slag and the strengths of alkaline-activated pastes prepared by different methods and this index optimizes the process of raw waste selection.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"647 ","pages":"Article 123278"},"PeriodicalIF":3.2,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533035","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 : 2024-10-28DOI: 10.1016/j.jnoncrysol.2024.123283
Paul W. White , Elijah Meakins , Jacob Petersen , Cassandra M. Birrenkott , Vladimir Keylin , Nickolaus M. Bruno , Tula R. Paudel
Amorphous materials exhibit complex atomic structures characterized by the absence of long-range order, in contrast to the well-defined periodicity of crystalline materials. This structural complexity is further pronounced in compositions such as FeMCuSiB (M = Nb, Mo, W and Ta), which incorporate elements with varying atomic radii and valencies. The Young's modulus of structures generated using traditional methods, such as melt-quenching and random packing, shows poor agreement with experimental data. In this study, we employ hybrid methods for generating the structures, which involve randomly packing elements without overlap, followed by thermalization at room temperature using Ab-initio Molecular Dynamics simulations. The Young's modulus evaluated from these structures aligns well with values measured using Dynamic Mechanical Analysis. Additionally, we utilize these structures to determine other elastic moduli including the bulk modulus and tetragonal shear modulus and find that the obtained values are consistent with the expected range for these compounds. We attribute the improved accuracy to a more representative approximation of the amorphous structure and the direct application of energy-strain relationships, rather than stress-strain relationships, for elastic moduli determination. Our methodology facilitates reliable predictions of the physical properties of amorphous materials and contributes to the design of FeMCuSiB (M = Nb, Mo, W and Ta) alloys with enhanced mechanical properties.
{"title":"Elastic properties of Fe95-yNb2Mo2Cu1Siy-xBx (x=5-8, y=20-26) at % amorphous alloys","authors":"Paul W. White , Elijah Meakins , Jacob Petersen , Cassandra M. Birrenkott , Vladimir Keylin , Nickolaus M. Bruno , Tula R. Paudel","doi":"10.1016/j.jnoncrysol.2024.123283","DOIUrl":"10.1016/j.jnoncrysol.2024.123283","url":null,"abstract":"<div><div>Amorphous materials exhibit complex atomic structures characterized by the absence of long-range order, in contrast to the well-defined periodicity of crystalline materials. This structural complexity is further pronounced in compositions such as FeMCuSiB (M = Nb, Mo, W and Ta), which incorporate elements with varying atomic radii and valencies. The Young's modulus of structures generated using traditional methods, such as melt-quenching and random packing, shows poor agreement with experimental data. In this study, we employ hybrid methods for generating the structures, which involve randomly packing elements without overlap, followed by thermalization at room temperature using Ab-initio Molecular Dynamics simulations. The Young's modulus evaluated from these structures aligns well with values measured using Dynamic Mechanical Analysis. Additionally, we utilize these structures to determine other elastic moduli including the bulk modulus and tetragonal shear modulus and find that the obtained values are consistent with the expected range for these compounds. We attribute the improved accuracy to a more representative approximation of the amorphous structure and the direct application of energy-strain relationships, rather than stress-strain relationships, for elastic moduli determination. Our methodology facilitates reliable predictions of the physical properties of amorphous materials and contributes to the design of FeMCuSiB (M = Nb, Mo, W and Ta) alloys with enhanced mechanical properties.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"647 ","pages":"Article 123283"},"PeriodicalIF":3.2,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533036","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 reduce optical losses due to scattering of radiation by crystals in Ga20Ge20Se60 glass-ceramics, selective doping of the glass matrix with lanthanum(III) selenide is proposed. Samples of the (100-x)Ga20Ge20Se60-xLa40Se60 (x = 0, 0.25, 0.625, 1.25, 2.5, 3.75, 5) glass- ceramics, which contain 40–57 vol.% of 3.0–4.6 μm sized sphalerite-type crystalline phases based on solid solutions of germanium(II, IV) selenides and gallium(III) selenide, are prepared. According to energy-dispersive spectroscopy data, lanthanum is concentrated in the glass matrix of glass-ceramics, and the distribution coefficient is 3.4 ± 0.6. An increase in the concentration of La in (100-x)Ga10Ge30Se60–xLa40Se60 (x = 0, 1.25, 2.5) glasses leads to the rise of their refractive index by 0.023±0.008, when replacing 0.25Ga + 0.75Ge → 1La. For the first time, 97.5Ga20Ge20Se60–2.5La40Se60 selenide glass-ceramics with a high volume content of micron-sized crystals and transparency of more than 50% in the 2–16 μm region are produced.
{"title":"Selective doping of Ga20Ge20Se60 glass-ceramic matrix with lanthanum(III) selenide to increase its optical transparency in the 2–10 μm spectral range","authors":"M.V. Sukhanov , R.D. Blagin , A.P. Velmuzhov , D.G. Fukina , K.V. Sidorenko , B.S. Stepanov , V.S. Shiryaev","doi":"10.1016/j.jnoncrysol.2024.123270","DOIUrl":"10.1016/j.jnoncrysol.2024.123270","url":null,"abstract":"<div><div>To reduce optical losses due to scattering of radiation by crystals in Ga<sub>20</sub>Ge<sub>20</sub>Se<sub>60</sub> glass-ceramics, selective doping of the glass matrix with lanthanum(III) selenide is proposed. Samples of the (100-x)Ga<sub>20</sub>Ge<sub>20</sub>Se<sub>60</sub>-xLa<sub>40</sub>Se<sub>60</sub> (<em>x</em> = 0, 0.25, 0.625, 1.25, 2.5, 3.75, 5) glass- ceramics, which contain 40–57 vol.% of 3.0–4.6 μm sized sphalerite-type crystalline phases based on solid solutions of germanium(II, IV) selenides and gallium(III) selenide, are prepared. According to energy-dispersive spectroscopy data, lanthanum is concentrated in the glass matrix of glass-ceramics, and the distribution coefficient is 3.4 ± 0.6. An increase in the concentration of La in (100-x)Ga<sub>10</sub>Ge<sub>30</sub>Se<sub>60</sub>–xLa<sub>40</sub>Se<sub>60</sub> (<em>x</em> = 0, 1.25, 2.5) glasses leads to the rise of their refractive index by 0.023±0.008, when replacing 0.25Ga + 0.75Ge → 1La. For the first time, 97.5Ga<sub>20</sub>Ge<sub>20</sub>Se<sub>60</sub>–2.5La<sub>40</sub>Se<sub>60</sub> selenide glass-ceramics with a high volume content of micron-sized crystals and transparency of more than 50% in the 2–16 μm region are produced.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"647 ","pages":"Article 123270"},"PeriodicalIF":3.2,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533033","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 : 2024-10-28DOI: 10.1016/j.jnoncrysol.2024.123268
Hongrui Wang, Bowen Liu, Dongqing Pang, Minglie Hu
In this paper, we successfully welded an ordinary glass and a single crystal graphite film without visible cracks by employing a high repetition femtosecond laser. The tensile strength of two welding samples exceeds those of the original films. Based on the SEM-EDS data and the Raman spectra data, two types of plasma welding regions can be clearly discriminated. The welding mechanism can be attributed to the mixture of graphite plasma and glass plasma and their resolidification. The energy density of single pulse at the interface is the most dominant factor because of this welding mechanism. From the Raman spectra data of the rear surface of the sample, how the shock wave influences the configurations of the C–C bonds in the graphite film can also be studied. Those results are helpful in understanding the dynamics of femtosecond laser welding and quickly optimizing laser parameters.
{"title":"Welding of glass and single crystal graphite film using a high repetition fs laser","authors":"Hongrui Wang, Bowen Liu, Dongqing Pang, Minglie Hu","doi":"10.1016/j.jnoncrysol.2024.123268","DOIUrl":"10.1016/j.jnoncrysol.2024.123268","url":null,"abstract":"<div><div>In this paper, we successfully welded an ordinary glass and a single crystal graphite film without visible cracks by employing a high repetition femtosecond laser. The tensile strength of two welding samples exceeds those of the original films. Based on the SEM-EDS data and the Raman spectra data, two types of plasma welding regions can be clearly discriminated. The welding mechanism can be attributed to the mixture of graphite plasma and glass plasma and their resolidification. The energy density of single pulse at the interface is the most dominant factor because of this welding mechanism. From the Raman spectra data of the rear surface of the <span><math><mrow><mn>20</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span> sample, how the shock wave influences the configurations of the C–C bonds in the graphite film can also be studied. Those results are helpful in understanding the dynamics of femtosecond laser welding and quickly optimizing laser parameters.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"647 ","pages":"Article 123268"},"PeriodicalIF":3.2,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533034","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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