Pub Date : 2025-03-05DOI: 10.1016/j.jnoncrysol.2025.123483
Yizhou Liu , Yanhuai Ding , Boyuan Yin , Meng Gao , Fu Xu
Capturing structural evolution information during stress relaxation is crucial to advancing the understanding of deformation mechanisms in metallic glass (MG). However, at room temperature, stress relaxation in most metallic glasses (MGs) is minimal, limiting progress in addressing these scientific challenges. This study investigates the room-temperature stress relaxation of Cu50Zr50 MG using nanoindentation and molecular dynamics (MD) simulations to elucidate atomic rearrangements and deformation mechanisms. Nanoindentation experiments revealed that loads reduce in a time-dependent manner, and both modulus and hardness diminish after relaxation. The Kohlrausch-Williams-Watts (KWW) function was utilized to simulate the stress relaxation behaviors. It was found that as the indentation depth increases, the dynamic heterogeneity increases. Complementary MD simulations illustrated atomic rearrangements during relaxation, visualized through nonaffine displacement distributions.
{"title":"Revealing structural evolution during stress relaxation in metallic glass by nanoindentation and molecular dynamic simulation","authors":"Yizhou Liu , Yanhuai Ding , Boyuan Yin , Meng Gao , Fu Xu","doi":"10.1016/j.jnoncrysol.2025.123483","DOIUrl":"10.1016/j.jnoncrysol.2025.123483","url":null,"abstract":"<div><div>Capturing structural evolution information during stress relaxation is crucial to advancing the understanding of deformation mechanisms in metallic glass (MG). However, at room temperature, stress relaxation in most metallic glasses (MGs) is minimal, limiting progress in addressing these scientific challenges. This study investigates the room-temperature stress relaxation of Cu<sub>50</sub>Zr<sub>50</sub> MG using nanoindentation and molecular dynamics (MD) simulations to elucidate atomic rearrangements and deformation mechanisms. Nanoindentation experiments revealed that loads reduce in a time-dependent manner, and both modulus and hardness diminish after relaxation. The Kohlrausch-Williams-Watts (KWW) function was utilized to simulate the stress relaxation behaviors. It was found that as the indentation depth increases, the dynamic heterogeneity increases. Complementary MD simulations illustrated atomic rearrangements during relaxation, visualized through nonaffine displacement distributions.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"656 ","pages":"Article 123483"},"PeriodicalIF":3.2,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548210","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 : 2025-03-04DOI: 10.1016/j.jnoncrysol.2025.123448
Michael R. Bull , Rachel C. Huber , Ping Yu , Tanner J Finney , Noah Felvey , Paul Chow , Yuming Xiao , Tonya L. Kuhl , Erik B. Watkins
The densification and X-ray scattering of mesoporous silica (SBA-15) were measured simultaneously under gigapascal (GPa) pressures. The results are compared to previous work on amorphous silica (aSiO2) and demonstrate the feasibility of measuring the densification of aSiO2 nanomaterials with small angle X-ray scattering (SAXS) in-situ in a diamond anvil cell. Compared to fused silica, the position of the SBA-15 first sharp diffraction peak (FSDP) is 7 times more sensitive to pressure and has a transition in its pressure dependance at a lower pressure (∼2 GPa vs. ∼13 GPa). SBA-15 has two densification regimes, low-density amorphous and high-density amorphous, which have equations of state comparable to low-density amorphous and high-density amorphous fused silica. The transition between these two regimes occurs at a lower pressure than for fused silica (∼1.5 GPa vs. ∼13 GPa). The results suggest that there is no direct relationship between the FSDP position and the aSiO2 density during compression.
{"title":"Probing the high-pressure densification of amorphous silica nanomaterials using SBA-15: An investigation into the paradoxical nature of the first sharp diffraction peak","authors":"Michael R. Bull , Rachel C. Huber , Ping Yu , Tanner J Finney , Noah Felvey , Paul Chow , Yuming Xiao , Tonya L. Kuhl , Erik B. Watkins","doi":"10.1016/j.jnoncrysol.2025.123448","DOIUrl":"10.1016/j.jnoncrysol.2025.123448","url":null,"abstract":"<div><div>The densification and X-ray scattering of mesoporous silica (SBA-15) were measured simultaneously under gigapascal (GPa) pressures. The results are compared to previous work on amorphous silica (<em>a</em>SiO<sub>2</sub>) and demonstrate the feasibility of measuring the densification of <em>a</em>SiO<sub>2</sub> nanomaterials with small angle X-ray scattering (SAXS) in-situ in a diamond anvil cell. Compared to fused silica, the position of the SBA-15 first sharp diffraction peak (FSDP) is 7 times more sensitive to pressure and has a transition in its pressure dependance at a lower pressure (∼2 GPa vs. ∼13 GPa). SBA-15 has two densification regimes, low-density amorphous and high-density amorphous, which have equations of state comparable to low-density amorphous and high-density amorphous fused silica. The transition between these two regimes occurs at a lower pressure than for fused silica (∼1.5 GPa vs. ∼13 GPa). The results suggest that there is no direct relationship between the FSDP position and the <em>a</em>SiO<sub>2</sub> density during compression.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"656 ","pages":"Article 123448"},"PeriodicalIF":3.2,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143534021","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 : 2025-03-04DOI: 10.1016/j.jnoncrysol.2025.123462
Wang Zhan , Jinhong Mo , Lingling Tang , Fan Shi , Le Chen , Lixia Li , Mingyi Chen , Qinghong Kong , Ru Zhou , Juncheng Jiang
Considering that the poor mechanical properties limit the application of SiO2 aerogels in fire insulation, polyurethane sponges, and mica were used to enhance the mechanical properties of SiO2 aerogels in this study. The effects of polyurethane sponges with different pore sizes and mica content on the thermal-mechanical properties of composite aerogels were investigated. The internal structure of the composite aerogels was analyzed by scanning electron microscopy. Moreover, the chemical structure and composition of the composite aerogels were characterized and analyzed. The results demonstrate that polyurethane sponges and mica can effectively enhance the mechanical properties of composite aerogels. However, the addition of mica increased the thermal conductivity. The experimental data will further expand the engineering application of SiO2 aerogels.
{"title":"Preparation and thermal-mechanical properties of physical and chemical dual-reinforced SiO2 aerogels","authors":"Wang Zhan , Jinhong Mo , Lingling Tang , Fan Shi , Le Chen , Lixia Li , Mingyi Chen , Qinghong Kong , Ru Zhou , Juncheng Jiang","doi":"10.1016/j.jnoncrysol.2025.123462","DOIUrl":"10.1016/j.jnoncrysol.2025.123462","url":null,"abstract":"<div><div>Considering that the poor mechanical properties limit the application of SiO<sub>2</sub> aerogels in fire insulation, polyurethane sponges, and mica were used to enhance the mechanical properties of SiO<sub>2</sub> aerogels in this study. The effects of polyurethane sponges with different pore sizes and mica content on the thermal-mechanical properties of composite aerogels were investigated. The internal structure of the composite aerogels was analyzed by scanning electron microscopy. Moreover, the chemical structure and composition of the composite aerogels were characterized and analyzed. The results demonstrate that polyurethane sponges and mica can effectively enhance the mechanical properties of composite aerogels. However, the addition of mica increased the thermal conductivity. The experimental data will further expand the engineering application of SiO<sub>2</sub> aerogels.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"656 ","pages":"Article 123462"},"PeriodicalIF":3.2,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143534022","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 : 2025-03-03DOI: 10.1016/j.jnoncrysol.2025.123477
Ruslan A. Sergiienko , Adit Sharma , Oleksandr A. Shcheretskyi , Vladislav Yu. Zadorozhnyy , Volodymyr O. Shcheretskyi , Oleksandr M. Myslyvchenko , Anatolii M. Verkhovliuk , Andrey A. Stepashkin , J.C. Qiao
{"title":"Corrigendum to “Thermophysical Properties of Zr65Cu17.5Ni10Al7.5 Bulk Metallic Glass” [Journal of Non-Crystalline Solids 652 (2025) 123400]","authors":"Ruslan A. Sergiienko , Adit Sharma , Oleksandr A. Shcheretskyi , Vladislav Yu. Zadorozhnyy , Volodymyr O. Shcheretskyi , Oleksandr M. Myslyvchenko , Anatolii M. Verkhovliuk , Andrey A. Stepashkin , J.C. Qiao","doi":"10.1016/j.jnoncrysol.2025.123477","DOIUrl":"10.1016/j.jnoncrysol.2025.123477","url":null,"abstract":"","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"656 ","pages":"Article 123477"},"PeriodicalIF":3.2,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143534023","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}
The paper presents original experimental data on the kinematic viscosity of liquid Co-Cu alloys with Cu contents of 10, 20, 30, 40, 50, 60, 70, 80, and 90 at.%. The measurements were conducted during heating from the liquidus temperature, TL, to 2000 K, followed by cooling of the melt to the stratification temperature, T**. The liquidus temperature, TL, and the melt stratification temperature, T**, were determined based on viscosimetric experiments. A change in the viscous flow regime of the melt during heating was observed at a specific temperature, T*, for each composition. This change is described by variations in the parameters of the Arrhenius equation: the pre-exponential factor and the activation energy. The authors attribute the change in the viscous flow regime at T* to a liquid-liquid structural transition.
An analysis of the temperature dependences of the viscosity of Co-Cu melts with Cu contents of 30, 40, 60, and 80 at.% in the temperature range from TL to T*, based on the theory of rate processes, indirectly indicates the presence of dispersed particles larger than 2 nm. These particles are enriched in one of the components, suspended in a medium of different composition, and separated by an interphase boundary. The concentration dependence of the viscosity of Co-u melts reveals pronounced minima at approximately 30 at.% and 70 at.% Cu, which can be explained by the two-phase structure of the metal before melting.
{"title":"Viscosity of liquid Co-Cu alloys","authors":"О.A. Chikova , V.S. Tsepelev , N.I. Sinitsin , K． Yu． Shmakova , V.V. V'yukhin","doi":"10.1016/j.jnoncrysol.2025.123481","DOIUrl":"10.1016/j.jnoncrysol.2025.123481","url":null,"abstract":"<div><div>The paper presents original experimental data on the kinematic viscosity of liquid Co-Cu alloys with Cu contents of 10, 20, 30, 40, 50, 60, 70, 80, and 90 at.%. The measurements were conducted during heating from the liquidus temperature, <em>T<sub>L</sub></em>, to 2000 K, followed by cooling of the melt to the stratification temperature, <em>T**</em>. The liquidus temperature, <em>T<sub>L</sub></em>, and the melt stratification temperature, <em>T**</em>, were determined based on viscosimetric experiments. A change in the viscous flow regime of the melt during heating was observed at a specific temperature, <em>T*</em>, for each composition. This change is described by variations in the parameters of the Arrhenius equation: the pre-exponential factor and the activation energy. The authors attribute the change in the viscous flow regime at <em>T*</em> to a liquid-liquid structural transition.</div><div>An analysis of the temperature dependences of the viscosity of Co-Cu melts with Cu contents of 30, 40, 60, and 80 at.% in the temperature range from <em>T<sub>L</sub></em> to <em>T*</em>, based on the theory of rate processes, indirectly indicates the presence of dispersed particles larger than 2 nm. These particles are enriched in one of the components, suspended in a medium of different composition, and separated by an interphase boundary. The concentration dependence of the viscosity of Co-u melts reveals pronounced minima at approximately 30 at.% and 70 at.% Cu, which can be explained by the two-phase structure of the metal before melting.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"656 ","pages":"Article 123481"},"PeriodicalIF":3.2,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521103","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 : 2025-02-27DOI: 10.1016/j.jnoncrysol.2025.123475
Fugang Wang , Fan Yang , Jiangtao Zhao , Peng Lv , Hengzhi Sun , Ahsan Ejaz , Tieshan Wang
Sodium borosilicate (NBS) glass is a potential material for high-level radioactive waste storage, with its mechanical properties critical to its stability under deep geological disposal conditions. This study investigates the effects of the K value (SiO2/B2O3 in mole percent), temperature, and strain rate on the Young's modulus, tensile strength, and fracture strain of NBS glass using molecular dynamics simulation. Results show that increasing the K value enhances tensile strength and fracture strain linearly. The transition from elastic to plastic deformation is driven by the conversion of Si-O structures. Young's modulus and tensile strength decrease linearly with rising temperature, but elevated temperatures also induce plastic flow, shifting the fracture behavior from brittle to ductile. Microstructural analysis reveals that higher temperatures accelerate B-O and Si-O structure conversion, increasing the strain needed for plastic deformation. Moreover, higher strain rates improve both Young's modulus and tensile strength.
{"title":"Molecular dynamics simulation of dynamic stretching of borosilicate glass","authors":"Fugang Wang , Fan Yang , Jiangtao Zhao , Peng Lv , Hengzhi Sun , Ahsan Ejaz , Tieshan Wang","doi":"10.1016/j.jnoncrysol.2025.123475","DOIUrl":"10.1016/j.jnoncrysol.2025.123475","url":null,"abstract":"<div><div>Sodium borosilicate (NBS) glass is a potential material for high-level radioactive waste storage, with its mechanical properties critical to its stability under deep geological disposal conditions. This study investigates the effects of the <em>K</em> value (SiO<sub>2</sub>/B<sub>2</sub>O<sub>3</sub> in mole percent), temperature, and strain rate on the Young's modulus, tensile strength, and fracture strain of NBS glass using molecular dynamics simulation. Results show that increasing the <em>K</em> value enhances tensile strength and fracture strain linearly. The transition from elastic to plastic deformation is driven by the conversion of Si-O structures. Young's modulus and tensile strength decrease linearly with rising temperature, but elevated temperatures also induce plastic flow, shifting the fracture behavior from brittle to ductile. Microstructural analysis reveals that higher temperatures accelerate B-O and Si-O structure conversion, increasing the strain needed for plastic deformation. Moreover, higher strain rates improve both Young's modulus and tensile strength.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"655 ","pages":"Article 123475"},"PeriodicalIF":3.2,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509636","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 : 2025-02-27DOI: 10.1016/j.jnoncrysol.2025.123460
J. Torrens-Serra , B. Kustov , P. Bruna
The influence of microalloying with Gd on the thermal stability, crystallization and magnetic properties of [Fe0.6Co0.4)0.75Si0.05B0.20]96-xNb4Gdx (x=0,1,2,5) metallic glasses was examined. Various glass-forming ability criteria were calculated based on thermal characteristics obtained by differential scanning calorimetry for melt-spun ribbons and compared to the maximum size achieved of the alloys via direct rod casting. Although thermodynamic-based criteria predict larger glass-forming ability for the alloy with higher Gd content, x=5 alloy showed the lowest ability to form full glassy rods. The structural evolution after first crystallization event was analyzed by x-ray diffraction and Transmission Mössbauer spectroscopy. The observed changes in the precipitated phases in x=5 alloy compared to x=0,1,2 alloys are associated to the decrease in the glass-forming ability. The formation of phases other than (FeCo)23B6 phase in x=5 alloy is responsible for not achieving fully glassy rods. Additionally, the magnetic properties of glassy ribbons are significantly affected by the addition of Gd. Saturation magnetization and Curie temperature decrease as Gd content increases.
{"title":"Effect of Gd on the devitrification and magnetic properties of [(Fe0.6Co0.4)0.75Si0.05B0.20]96-xNb4Gdx metallic glasses","authors":"J. Torrens-Serra , B. Kustov , P. Bruna","doi":"10.1016/j.jnoncrysol.2025.123460","DOIUrl":"10.1016/j.jnoncrysol.2025.123460","url":null,"abstract":"<div><div>The influence of microalloying with Gd on the thermal stability, crystallization and magnetic properties of [Fe<sub>0.6</sub>Co<sub>0.4</sub>)<sub>0.75</sub>Si<sub>0.05</sub>B<sub>0.20</sub>]<sub>96-x</sub>Nb<sub>4</sub>Gd<sub>x</sub> (x=0,1,2,5) metallic glasses was examined. Various glass-forming ability criteria were calculated based on thermal characteristics obtained by differential scanning calorimetry for melt-spun ribbons and compared to the maximum size achieved of the alloys via direct rod casting. Although thermodynamic-based criteria predict larger glass-forming ability for the alloy with higher Gd content, x=5 alloy showed the lowest ability to form full glassy rods. The structural evolution after first crystallization event was analyzed by x-ray diffraction and Transmission Mössbauer spectroscopy. The observed changes in the precipitated phases in x=5 alloy compared to x=0,1,2 alloys are associated to the decrease in the glass-forming ability. The formation of phases other than (FeCo)<sub>23</sub>B<sub>6</sub> phase in x=5 alloy is responsible for not achieving fully glassy rods. Additionally, the magnetic properties of glassy ribbons are significantly affected by the addition of Gd. Saturation magnetization and Curie temperature decrease as Gd content increases.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"655 ","pages":"Article 123460"},"PeriodicalIF":3.2,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509634","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 : 2025-02-26DOI: 10.1016/j.jnoncrysol.2025.123461
Ping Lu , Xingyu Wu , Jianqing Yang , Yinsheng Xu , Mengling Xia , Dong Wu
The poor mechanical properties are the bottle neck for the applications of chalcogenide glasses to the integrated devices for infrared sensing and imaging. In this study, a series of (100-x)GeS2-xSb2S3 glasses were synthesized with the substitutional addition of Sb2S3 into the Ge-S glass network, and the mechanical properties were affected accordingly. Linear relations were found between the hardness of the GSSx glasses and the topological constraints. The conventional Makishima-Mackenzie model underestimated the elastic moduli of the ternary chalcogenide glasses, while it is promising to quantify the moduli in terms of free energy density of the topological constraints. The creep stress exponent was found to vary with the evolution of glass network rather than the variation of topological constraint. Lastly, the fracture toughness seems to be insensitive to the topological constraints, and the improved local ductility was suggested to occur in the GSSx glasses with high Sb content.
{"title":"Theoretical analysis on the correlations between the mechanical properties and structures of (100-x)GeS2-xSb2S3 chalcogenide glasses","authors":"Ping Lu , Xingyu Wu , Jianqing Yang , Yinsheng Xu , Mengling Xia , Dong Wu","doi":"10.1016/j.jnoncrysol.2025.123461","DOIUrl":"10.1016/j.jnoncrysol.2025.123461","url":null,"abstract":"<div><div>The poor mechanical properties are the bottle neck for the applications of chalcogenide glasses to the integrated devices for infrared sensing and imaging. In this study, a series of (100-<em>x</em>)GeS<sub>2</sub>-<em>x</em>Sb<sub>2</sub>S<sub>3</sub> glasses were synthesized with the substitutional addition of Sb<sub>2</sub>S<sub>3</sub> into the Ge-S glass network, and the mechanical properties were affected accordingly. Linear relations were found between the hardness of the <em>GSSx</em> glasses and the topological constraints. The conventional Makishima-Mackenzie model underestimated the elastic moduli of the ternary chalcogenide glasses, while it is promising to quantify the moduli in terms of free energy density of the topological constraints. The creep stress exponent was found to vary with the evolution of glass network rather than the variation of topological constraint. Lastly, the fracture toughness seems to be insensitive to the topological constraints, and the improved local ductility was suggested to occur in the <em>GSSx</em> glasses with high Sb content.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"655 ","pages":"Article 123461"},"PeriodicalIF":3.2,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509635","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}
This study presents a method for the production of SiO2 wires in a system composed of isopropanol, polyvinylpyrrolidone, ammonia and sodium citrate. The typical wires were mildly curved with an average diameter of 500 nm and an aspect ratio up to 60 or more. A 50-fold expansion of this process still gave stable wires with a yield of about 86 %. Monitoring the sodium levels along the SiO2 wires revealed that sodium was present in different parts of the wires. Based on this phenomenon, we propose a growth mechanism for SiO2 wires. The present system produces SiO2 wires more stably and efficiently than the previously reported n-pentanol-PVP-ammonia-sodium citrate method, while significantly reducing both the amount of PVP and the preparation time.
{"title":"Stable synthesis of high aspect ratio submicron SiO2 wires by wet chemical methods","authors":"Tianfeng Yang, Dongxue Ren, Xiaping Zhu, Qing Li, Haiyan Li, Jia Chen, Hongyi Sun, Yonghua Sun","doi":"10.1016/j.jnoncrysol.2025.123473","DOIUrl":"10.1016/j.jnoncrysol.2025.123473","url":null,"abstract":"<div><div>This study presents a method for the production of SiO<sub>2</sub> wires in a system composed of isopropanol, polyvinylpyrrolidone, ammonia and sodium citrate. The typical wires were mildly curved with an average diameter of 500 nm and an aspect ratio up to 60 or more. A 50-fold expansion of this process still gave stable wires with a yield of about 86 %. Monitoring the sodium levels along the SiO<sub>2</sub> wires revealed that sodium was present in different parts of the wires. Based on this phenomenon, we propose a growth mechanism for SiO<sub>2</sub> wires. The present system produces SiO<sub>2</sub> wires more stably and efficiently than the previously reported n-pentanol-PVP-ammonia-sodium citrate method, while significantly reducing both the amount of PVP and the preparation time.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"655 ","pages":"Article 123473"},"PeriodicalIF":3.2,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471734","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 : 2025-02-22DOI: 10.1016/j.jnoncrysol.2025.123463
N. Shchedrina , M. Lancry , T. Charpentier , D. Neuville , N. Ollier
This study investigates the structural and thermal stability of metamict-like silica glass samples prepared through different thermomechanical pathways and then subjected to the same high dose of electron irradiation (11 GGy). Specifically, we compared Suprasil F300 silica glass samples treated with high-pressure high-temperature (HPHT) conditions followed by irradiation to those solely irradiated. Additionally, Suprasil CG samples were analyzed to investigate the effect of silica impurities (e.g. OH) on the resulting state. Using Raman and FTIR spectroscopy, along with photoluminescence spectroscopy, we analyzed the vibrational structure and point defects changes. The activation energy distribution of the densification relaxation process was calculated to assess its thermal stability in a reliable manner. The results demonstrate that, despite achieving similar densities and vibrational structures in the metamict-like state, the initial structure of silica significantly influences the thermal stability and the resulting point defects population.
{"title":"Impact of the silica glass initial state on the thermal and structural properties of metamict-like silica glass","authors":"N. Shchedrina , M. Lancry , T. Charpentier , D. Neuville , N. Ollier","doi":"10.1016/j.jnoncrysol.2025.123463","DOIUrl":"10.1016/j.jnoncrysol.2025.123463","url":null,"abstract":"<div><div>This study investigates the structural and thermal stability of metamict-like silica glass samples prepared through different thermomechanical pathways and then subjected to the same high dose of electron irradiation (11 GGy). Specifically, we compared Suprasil F300 silica glass samples treated with high-pressure high-temperature (HPHT) conditions followed by irradiation to those solely irradiated. Additionally, Suprasil CG samples were analyzed to investigate the effect of silica impurities (e.g. OH) on the resulting state. Using Raman and FTIR spectroscopy, along with photoluminescence spectroscopy, we analyzed the vibrational structure and point defects changes. The activation energy distribution of the densification relaxation process was calculated to assess its thermal stability in a reliable manner. The results demonstrate that, despite achieving similar densities and vibrational structures in the metamict-like state, the initial structure of silica significantly influences the thermal stability and the resulting point defects population.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"655 ","pages":"Article 123463"},"PeriodicalIF":3.2,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471733","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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