Pub Date : 2025-04-26DOI: 10.1016/j.jnoncrysol.2025.123571
Heng Kang , Nannan Ren , Yunjiang Wang , Pengfei Guan
Ductilizing amorphous metals without sacrificing strength is challenging due to unclear plasticity carriers. This study attempts to mimic the microalloying strategy of physical metallurgy in computer simulations by selectively pinning a small fraction of typical atoms in metallic glass, which is targeted to efficiently optimize the mechanical properties. We found that pinning atoms with high participation in the low-frequency vibrational modes are more effective in strengthening, attributing to a mechanism of scale-dependent pinning effect. By pinning only 2 % atoms in the unstable glassy samples, one can achieve shear modulus comparable to samples prepared with cooling rates that are eight orders of magnitude slower, highlighting the validity of microalloying over thermal treatment. Moreover, this microalloying approach not only control elastic properties, but also mitigates the failure mode of metallic glass. It demonstrates that restricting the motion of atoms in regions external to the shear band plays a critical role in inhibiting the propagation of the shear band.
{"title":"Tuning mechanics of metallic glasses via in silico microalloying","authors":"Heng Kang , Nannan Ren , Yunjiang Wang , Pengfei Guan","doi":"10.1016/j.jnoncrysol.2025.123571","DOIUrl":"10.1016/j.jnoncrysol.2025.123571","url":null,"abstract":"<div><div>Ductilizing amorphous metals without sacrificing strength is challenging due to unclear plasticity carriers. This study attempts to mimic the microalloying strategy of physical metallurgy in computer simulations by selectively pinning a small fraction of typical atoms in metallic glass, which is targeted to efficiently optimize the mechanical properties. We found that pinning atoms with high participation in the low-frequency vibrational modes are more effective in strengthening, attributing to a mechanism of scale-dependent pinning effect. By pinning only 2 % atoms in the unstable glassy samples, one can achieve shear modulus comparable to samples prepared with cooling rates that are eight orders of magnitude slower, highlighting the validity of microalloying over thermal treatment. Moreover, this microalloying approach not only control elastic properties, but also mitigates the failure mode of metallic glass. It demonstrates that restricting the motion of atoms in regions external to the shear band plays a critical role in inhibiting the propagation of the shear band.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"661 ","pages":"Article 123571"},"PeriodicalIF":3.2,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874174","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 : 2025-04-23DOI: 10.1016/j.jnoncrysol.2025.123553
Peter Grouleff Jensen , Laura Skovby , Mette Solvang , Louise Belmonte , Qiuju Zheng , Yuanzheng Yue
Mineral wool, especially stone wool, is a sustainable, fire-safe insulation material. Its fire safety depends, amongst other factors, on its high-temperature stability (HTS), that is, its resistance to volumetric shrinking during heating. Using glass particle pellets as an analogue for mineral wool fibres, we observed a positive correlation between particle size and HTS, as well as between particle size and crystallisation temperatures, and an inverse correlation between particle size and the degree of iron oxidation upon heating. To investigate the composition dependence of HTS, we prepared two series of aluminosilicate glass particle pellets: one with varying MgO/(MgO+CaO) molar ratio (referred to as the CaO-MgO series) and another with varying MgO/(MgO+FeO) molar ratio (referred to as the FeO-MgO series). The results showed that substituting MgO for CaO resulted in decreased glass stability, a lowered onset temperature of shrinking, a reduced shrinking rate, and an increased HTS. In comparison, substituting MgO for FeO led to increased glass stability, an increased shrinking rate, and a decreased HTS. Crystallisation occurs right after the glass transition for the FeO-rich FeO-MgO samples and MgO-rich CaO-MgO samples, but a residual glassy phase remains. Upon further heating, the residual glassy phase undergoes viscous deformation, leading to a significantly reduced temperature of the final collapse of the glass particle pellets. This work provides a facile and efficient approach to studying the HTS of glass particle pellets as an analogue for mineral wool fibres.
{"title":"High-temperature stability of aluminosilicate glass particle pellets and its dependence on chemical composition","authors":"Peter Grouleff Jensen , Laura Skovby , Mette Solvang , Louise Belmonte , Qiuju Zheng , Yuanzheng Yue","doi":"10.1016/j.jnoncrysol.2025.123553","DOIUrl":"10.1016/j.jnoncrysol.2025.123553","url":null,"abstract":"<div><div>Mineral wool, especially stone wool, is a sustainable, fire-safe insulation material. Its fire safety depends, amongst other factors, on its high-temperature stability (HTS), that is, its resistance to volumetric shrinking during heating. Using glass particle pellets as an analogue for mineral wool fibres, we observed a positive correlation between particle size and HTS, as well as between particle size and crystallisation temperatures, and an inverse correlation between particle size and the degree of iron oxidation upon heating. To investigate the composition dependence of HTS, we prepared two series of aluminosilicate glass particle pellets: one with varying MgO/(MgO+CaO) molar ratio (referred to as the CaO-MgO series) and another with varying MgO/(MgO+FeO) molar ratio (referred to as the FeO-MgO series). The results showed that substituting MgO for CaO resulted in decreased glass stability, a lowered onset temperature of shrinking, a reduced shrinking rate, and an increased HTS. In comparison, substituting MgO for FeO led to increased glass stability, an increased shrinking rate, and a decreased HTS. Crystallisation occurs right after the glass transition for the FeO-rich FeO-MgO samples and MgO-rich CaO-MgO samples, but a residual glassy phase remains. Upon further heating, the residual glassy phase undergoes viscous deformation, leading to a significantly reduced temperature of the final collapse of the glass particle pellets. This work provides a facile and efficient approach to studying the HTS of glass particle pellets as an analogue for mineral wool fibres.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"660 ","pages":"Article 123553"},"PeriodicalIF":3.2,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143859852","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 cracking behaviors of transparent glass ceramics have attracted much attention due to the application as a cover material for smartphones, and it is beneficial to fundamentally understand their origin. In this study, the cracks were induced by scratch and indentation, and their occurrence has been analyzed according to the Weibull’s statistical model. The roles of microstructure on the initiations and propagations of cracks were discussed in terms of modeling parameters, which provided hints for the cracking mechanisms. Overall, it was found that crystallization contributed to the formation of cracks, which seems to be inconsistent with the common sense that crystallites in glass ceramics hinder the cracking. According to the statistical analysis, the critical stress or load for crack initiation is suggested to drop due to the residual stress introduced by crystallization, while the crack propagation is still impeded by the crystalline phases and brings up the fracture toughness (KIC).
{"title":"Effects of microstructure on the cracking behaviors in the lithium aluminosilicate glass ceramics: A statistical analysis","authors":"Ping Lu , Jingxi Chen , Yu Rao , Jialin Cui , Yinsheng Xu , Mengling Xia , Dong Wu , Guanchao Yin","doi":"10.1016/j.jnoncrysol.2025.123559","DOIUrl":"10.1016/j.jnoncrysol.2025.123559","url":null,"abstract":"<div><div>The cracking behaviors of transparent glass ceramics have attracted much attention due to the application as a cover material for smartphones, and it is beneficial to fundamentally understand their origin. In this study, the cracks were induced by scratch and indentation, and their occurrence has been analyzed according to the Weibull’s statistical model. The roles of microstructure on the initiations and propagations of cracks were discussed in terms of modeling parameters, which provided hints for the cracking mechanisms. Overall, it was found that crystallization contributed to the formation of cracks, which seems to be inconsistent with the common sense that crystallites in glass ceramics hinder the cracking. According to the statistical analysis, the critical stress or load for crack initiation is suggested to drop due to the residual stress introduced by crystallization, while the crack propagation is still impeded by the crystalline phases and brings up the fracture toughness (K<sub>IC</sub>).</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"660 ","pages":"Article 123559"},"PeriodicalIF":3.2,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143859854","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 : 2025-04-22DOI: 10.1016/j.jnoncrysol.2025.123557
R.L. Liu, Z. Li, Q.L. Liu, B. Yi
Diamond-like carbon (DLC) coatings were rapidly synthesized on the surface of AISI 304 austenitic stainless steel by utilizing a low-voltage plasma electrolytic deposition (PED) method with an acetonitrile solution. The results show that, as the deposition time increases, the intensity ratio of the D and G peaks (ID/IG) in Raman spectroscopy initially rises and then subsequently declines, the lowest value of which is 1.17 for the coating deposited at 260 V for 60 min, and X-ray photoelectron spectroscopy (XPS) analysis indicates that the sp3-C content of which achieves to 63.63 %. As for the coating deposited at 260 V for 60 min with the thickness of 2.4 μm demonstrates a superior corrosion resistance in 3.5 wt.% NaCl solution, comparison to the untreated stainless steel, the corrosion potential of which increases from -0.540 V to -0.418 V, the corrosion current density decreases from 9.294 × 10–6 A/cm2 to 3.603 × 10–6 A/cm2, and the polarization resistance rises from 5375 Ω·cm2 to 12,181 Ω·cm2. The present DLC coating with excellent corrosion resistance will be suitable for corrosion protection of metallic materials in marine environments. Analysis of the corrosion mechanisms reveals that coatings with a higher sp3-C content exhibit lower electrical conductivity, which restricts electron transport within the coating surface. Therefore, the DLC coating with a higher sp3/sp2 ratio displays superior corrosion resistance.
{"title":"Rapid fabrication of diamond-like carbon coating with excellent corrosion resistance by low-voltage plasma electrolytic deposition","authors":"R.L. Liu, Z. Li, Q.L. Liu, B. Yi","doi":"10.1016/j.jnoncrysol.2025.123557","DOIUrl":"10.1016/j.jnoncrysol.2025.123557","url":null,"abstract":"<div><div>Diamond-like carbon (DLC) coatings were rapidly synthesized on the surface of AISI 304 austenitic stainless steel by utilizing a low-voltage plasma electrolytic deposition (PED) method with an acetonitrile solution. The results show that, as the deposition time increases, the intensity ratio of the D and G peaks (I<sub>D</sub>/I<sub>G</sub>) in Raman spectroscopy initially rises and then subsequently declines, the lowest value of which is 1.17 for the coating deposited at 260 V for 60 min, and X-ray photoelectron spectroscopy (XPS) analysis indicates that the sp<sup>3</sup>-C content of which achieves to 63.63 %. As for the coating deposited at 260 V for 60 min with the thickness of 2.4 μm demonstrates a superior corrosion resistance in 3.5 wt.% NaCl solution, comparison to the untreated stainless steel, the corrosion potential of which increases from -0.540 V to -0.418 V, the corrosion current density decreases from 9.294 × 10<sup>–</sup><sup>6</sup> A/cm<sup>2</sup> to 3.603 × 10<sup>–</sup><sup>6</sup> A/cm<sup>2</sup>, and the polarization resistance rises from 5375 Ω·cm<sup>2</sup> to 12,181 Ω·cm<sup>2</sup>. The present DLC coating with excellent corrosion resistance will be suitable for corrosion protection of metallic materials in marine environments. Analysis of the corrosion mechanisms reveals that coatings with a higher sp<sup>3</sup>-C content exhibit lower electrical conductivity, which restricts electron transport within the coating surface. Therefore, the DLC coating with a higher sp<sup>3</sup>/sp<sup>2</sup> ratio displays superior corrosion resistance.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"660 ","pages":"Article 123557"},"PeriodicalIF":3.2,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143859853","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 : 2025-04-21DOI: 10.1016/j.jnoncrysol.2025.123554
Xiaohan Cheng , Ping Huang , Fei Wang
Despite the copious prior investigations into the forming ability of bulk metallic glasses (BMGs), accurately predicting glass forming ability (GFA) has persisted as a formidable challenge. By incorporating relative energy (RE, defined as the difference between the total energy of the alloy and the reference state of its constituent elements), which has been hitherto largely overlooked in machine learning (ML) prediction analyses, we demonstrate effective improvements in multiple ML models involving Extreme Gradient Boosting, Support Vector Regression, Linear Regression, and Decision Trees. Moreover, feature importance analysis based on SHAP (SHapley Additive exPlanations) summary plot indicates that RE ranks first in all four ML models, highlighting its crucial role in ML prediction of GFA, providing a new perspective for understanding and predicting GFA of MGs.
{"title":"Machine learning prediction of metallic glass forming ability: The pivotal role of relative energy","authors":"Xiaohan Cheng , Ping Huang , Fei Wang","doi":"10.1016/j.jnoncrysol.2025.123554","DOIUrl":"10.1016/j.jnoncrysol.2025.123554","url":null,"abstract":"<div><div>Despite the copious prior investigations into the forming ability of bulk metallic glasses (BMGs), accurately predicting glass forming ability (GFA) has persisted as a formidable challenge. By incorporating relative energy (RE, defined as the difference between the total energy of the alloy and the reference state of its constituent elements), which has been hitherto largely overlooked in machine learning (ML) prediction analyses, we demonstrate effective improvements in multiple ML models involving Extreme Gradient Boosting, Support Vector Regression, Linear Regression, and Decision Trees. Moreover, feature importance analysis based on SHAP (SHapley Additive exPlanations) summary plot indicates that RE ranks first in all four ML models, highlighting its crucial role in ML prediction of GFA, providing a new perspective for understanding and predicting GFA of MGs.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"660 ","pages":"Article 123554"},"PeriodicalIF":3.2,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143851751","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 : 2025-04-21DOI: 10.1016/j.jnoncrysol.2025.123517
K. Nepal , A. Gautam , C. Ugwumadu , D.A. Drabold
We present new atomistic models of amorphous silicon (a-Si) and hydrogenated amorphous silicon (a-Si:H) surfaces. The a-Si model included 4096 atoms and was obtained using local orbital density functional theory. By analyzing a slab model (periodic in two dimensions with a slab about 44 Å thick), we observed a strong correlation between surface structure and surface charge density, which might be compared to STM experiments. Hydrogen atoms added near the under-coordinated surface atoms passivate dangling bonds and induce structural rearrangements. We analyze the electronic structure, including the localization of the states, and note resonant mixing between bulk and surface defect structures. We also compute the classical normal modes of the hydrogenated a-Si and compare them to experiments where possible. Our work is a step towards understanding the meaning of “surface reconstruction” for a noncrystalline material.
{"title":"New models of clean and hydrogenated amorphous silicon surfaces","authors":"K. Nepal , A. Gautam , C. Ugwumadu , D.A. Drabold","doi":"10.1016/j.jnoncrysol.2025.123517","DOIUrl":"10.1016/j.jnoncrysol.2025.123517","url":null,"abstract":"<div><div>We present new atomistic models of amorphous silicon (a-Si) and hydrogenated amorphous silicon (a-Si:H) surfaces. The a-Si model included 4096 atoms and was obtained using local orbital density functional theory. By analyzing a slab model (periodic in two dimensions with a slab about 44 Å thick), we observed a strong correlation between surface structure and surface charge density, which might be compared to STM experiments. Hydrogen atoms added near the under-coordinated surface atoms passivate dangling bonds and induce structural rearrangements. We analyze the electronic structure, including the localization of the states, and note resonant mixing between bulk and surface defect structures. We also compute the classical normal modes of the hydrogenated a-Si and compare them to experiments where possible. Our work is a step towards understanding the meaning of “surface reconstruction” for a noncrystalline material.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"660 ","pages":"Article 123517"},"PeriodicalIF":3.2,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143851745","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 : 2025-04-18DOI: 10.1016/j.jnoncrysol.2025.123552
M.F. Hasaneen, Meshal Alzaid, Mohammed Ezzeldian, A.A. El-Maaref, N.M.A. Hadia
The electron beam evaporation (EBE) method was used to deposit (CdO)1-x(ZnO)x films on glass substrates. X-ray diffraction methods revealed the films to have a polycrystalline structure for CdO. The intensity of the peaks decreased and the full width at half maximum (FWHM) increased with growth in the ZnO content. Thus, the peaks shifted to the right. Also, the results showed that for the pure ZnO, the phase transition to the disordered region occurred. FE-SEM and AFM analysis were utilized for the determination of the reduction in particle size as the concentration of ZnO was increased. With increased ZnO concentrations, the optical energy gap increased, accompanied by increases in both the average refractive index and extinction coefficient. Electrical resistivity reduced from 1622 Ωcm at x = 0 to 86 Ωcm at x = 0.5 and then increased to 2188 Ωcm at x = 1. These thin films have a lot of different physical properties. This data points out their possible utilization in some optoelectronic devices, which specifically involves the inevitable interconnectivity of charge carriers and light absorption, which is a very convincing reason for solid/compound for the solar cell and photodetector applications.
采用电子束蒸发（EBE）方法在玻璃基底上沉积了 (CdO)1-x(ZnO)x 薄膜。X 射线衍射方法显示薄膜具有 CdO 的多晶结构。随着氧化锌含量的增加，峰值强度降低，半最大值全宽（FWHM）增加。因此，峰值向右移动。结果还显示，纯氧化锌发生了向无序区的相变。利用 FE-SEM 和原子力显微镜分析确定了随着氧化锌浓度的增加，颗粒尺寸的减小情况。随着氧化锌浓度的增加，光学能隙也随之增加，同时平均折射率和消光系数也增加了。电阻率从 x = 0 时的 1622 Ωcm 下降到 x = 0.5 时的 86 Ωcm，然后又上升到 x = 1 时的 2188 Ωcm。这些薄膜具有许多不同的物理特性。这些数据表明，它们有可能用于某些光电设备，其中特别涉及到电荷载流子和光吸收之间不可避免的相互联系，这是固体/化合物应用于太阳能电池和光电探测器的一个非常有说服力的理由。
{"title":"Synthesis and physical properties of (CdO)1-x(ZnO)x thin films obtained by electron beam evaporation for solar cell application","authors":"M.F. Hasaneen, Meshal Alzaid, Mohammed Ezzeldian, A.A. El-Maaref, N.M.A. Hadia","doi":"10.1016/j.jnoncrysol.2025.123552","DOIUrl":"10.1016/j.jnoncrysol.2025.123552","url":null,"abstract":"<div><div>The electron beam evaporation (EBE) method was used to deposit (CdO)<sub>1-x</sub>(ZnO)<sub>x</sub> films on glass substrates. X-ray diffraction methods revealed the films to have a polycrystalline structure for CdO. The intensity of the peaks decreased and the full width at half maximum (FWHM) increased with growth in the ZnO content. Thus, the peaks shifted to the right. Also, the results showed that for the pure ZnO, the phase transition to the disordered region occurred. FE-SEM and AFM analysis were utilized for the determination of the reduction in particle size as the concentration of ZnO was increased. With increased ZnO concentrations, the optical energy gap increased, accompanied by increases in both the average refractive index and extinction coefficient. Electrical resistivity reduced from 1622 Ωcm at x = 0 to 86 Ωcm at x = 0.5 and then increased to 2188 Ωcm at x = 1. These thin films have a lot of different physical properties. This data points out their possible utilization in some optoelectronic devices, which specifically involves the inevitable interconnectivity of charge carriers and light absorption, which is a very convincing reason for solid/compound for the solar cell and photodetector applications.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"660 ","pages":""},"PeriodicalIF":3.2,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842622","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 : 2025-04-17DOI: 10.1016/j.jnoncrysol.2025.123541
Paramesh Goud Yamagouni , Ravi Nirlakalla
Transition metal oxides (V2O5, Fe2O3, MnO2) and Na2O -doped tellurite (TeO2) glasses (TVFN) and (TVFNMn), were fabricated to examine for structural, magnetic and optical properties. The concentration of OH⁻ ions in TVFNMn glasses was determined to be ∼1.2932 × 10¹⁸ ions/cm³. Solid-state ²³Na nuclear magnetic resonance spectroscopy of TVFN glass showed broadened and split peaks. Electron spin resonance spectroscopy of TVFNMn glasses are evidenced for free electrons by a g value of 1.994. Magnetic measurements using a vibrating sample magnetometer showed that TVFNMn glasses exhibit a high saturation magnetization of 0.3118 Am²/Kg and a remanence of 22.69 × 10⁻³ Am²/Kg. In addition, the paramagnetic TVFN glasses were revealed a Verdet constant of -8.83 rad T−1m−1 at 550 nm wavelength. Optical band gap measurements revealed both direct (1.91 eV) and indirect (0.25 eV) band gaps in TVFNMn glasses. These results find that TVFNMn glasses are promising for Faraday rotator applications.
{"title":"MnO2-doped tellurite glasses: Potential and performance in faraday rotator technologies","authors":"Paramesh Goud Yamagouni , Ravi Nirlakalla","doi":"10.1016/j.jnoncrysol.2025.123541","DOIUrl":"10.1016/j.jnoncrysol.2025.123541","url":null,"abstract":"<div><div>Transition metal oxides (V<sub>2</sub>O<sub>5</sub>, Fe<sub>2</sub>O<sub>3</sub>, MnO<sub>2</sub>) and Na<sub>2</sub>O -doped tellurite (TeO<sub>2</sub>) glasses (TVFN) and (TVFNMn), were fabricated to examine for structural, magnetic and optical properties. The concentration of OH⁻ ions in TVFNMn glasses was determined to be ∼1.2932 × 10¹⁸ ions/cm³. Solid-state ²³Na nuclear magnetic resonance spectroscopy of TVFN glass showed broadened and split peaks. Electron spin resonance spectroscopy of TVFNMn glasses are evidenced for free electrons by a <em>g</em> value of 1.994. Magnetic measurements using a vibrating sample magnetometer showed that TVFNMn glasses exhibit a high saturation magnetization of 0.3118 Am²/Kg and a remanence of 22.69 × 10⁻³ Am²/Kg. In addition, the paramagnetic TVFN glasses were revealed a Verdet constant of -8.83 rad T<sup>−1</sup>m<sup>−1</sup> at 550 nm wavelength. Optical band gap measurements revealed both direct (1.91 eV) and indirect (0.25 eV) band gaps in TVFNMn glasses. These results find that TVFNMn glasses are promising for Faraday rotator applications.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"660 ","pages":"Article 123541"},"PeriodicalIF":3.2,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143838808","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 : 2025-04-16DOI: 10.1016/j.jnoncrysol.2025.123523
Aleksandra Stojic , Alexander Sehlke , Alan G. Whittington , Andreas Morlok , Harald Hiesinger
Understanding the unique spectral signatures of glasses is relevant in a remote sensing context. Three basaltic glasses characterized by the system SiO2-Al2O3-MgOCaO, with up to 0.3–3.7 wt. % FeO, 0 to 7.0 wt. % Na2O, and <1 wt. % of TiO2, Cr2O3, MnO, and K2O are investigated spectrally in this study. We found a flank-like attachment to the dominant mainband vibration (∼ 1060 and 944cm-1) located between 800 – 650cm-1 in the reflectance mid-infrared spectra (MIR) that correlates well with the respective polymerization degree of the glass. We furthermore report the occurrence of a peak splitting in the mainband vibration in the sodium – poor glass batch between 1180 and 900cm-1, which is not attributable to incipient crystallization processes, but is probably caused by Mg2+ assuming roles as both, charge balancing cation and modifier. The results of this study were compared with glasses from Chang'E lunar samples reported by Zeng et al. [1].
{"title":"A detailed µ-FTIR study of Hermean glasses: Spectral mainband shape and flank, what do they tell us?","authors":"Aleksandra Stojic , Alexander Sehlke , Alan G. Whittington , Andreas Morlok , Harald Hiesinger","doi":"10.1016/j.jnoncrysol.2025.123523","DOIUrl":"10.1016/j.jnoncrysol.2025.123523","url":null,"abstract":"<div><div>Understanding the unique spectral signatures of glasses is relevant in a remote sensing context. Three basaltic glasses characterized by the system SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>-MgO<img>CaO, with up to 0.3–3.7 wt. % FeO, 0 to 7.0 wt. % Na<sub>2</sub>O, and <1 wt. % of TiO<sub>2</sub>, Cr<sub>2</sub>O<sub>3</sub>, MnO, and K<sub>2</sub>O are investigated spectrally in this study. We found a flank-like attachment to the dominant mainband vibration (∼ 1060 and 944cm<sup>-1</sup>) located between 800 – 650cm<sup>-1</sup> in the reflectance mid-infrared spectra (MIR) that correlates well with the respective polymerization degree of the glass. We furthermore report the occurrence of a peak splitting in the mainband vibration in the sodium – poor glass batch between 1180 and 900cm<sup>-1</sup>, which is not attributable to incipient crystallization processes, but is probably caused by Mg<sup>2+</sup> assuming roles as both, charge balancing cation and modifier. The results of this study were compared with glasses from Chang'E lunar samples reported by Zeng et al. [1].</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"660 ","pages":"Article 123523"},"PeriodicalIF":3.2,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143838809","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 : 2025-04-16DOI: 10.1016/j.jnoncrysol.2025.123521
Elizabeth M. Tsekrekas , Nagia S. Tagiara , Randall E. Youngman , Efstratios I. Kamitsos , Alexis G. Clare
Lead borate glasses in the system xPbO-(100-x)B2O3 have been prepared in platinum and alumina crucibles. Glasses were investigated qualitatively by Raman and infrared spectroscopies, and quantitatively by NMR spectroscopy, to determine the effect of Al2O3 contamination on the glass network. Glasses melted in a platinum crucible had a formation range of 30 ≤ x ≤ 80 mol% PbO, while glasses prepared in alumina crucibles experienced an expansion in the formation range, i.e. 20 ≤ x ≤ 85 mol%, as a result of Al2O3 contamination from the alumina crucible. Both the mid-frequency Raman and infrared data, as well as NMR spectroscopy, suggest that the introduction of Al2O3 within the glass results in the under-modification of the borate network due to the formation of anionic AlOn type units charge balanced by Pb2+ ions. This is also reflected in the low-frequency region of the Raman and infrared spectra, which relates to the Pb-O vibrations, where the Pb-O bonding remains predominately ionic for a larger composition range in the Al2O3 contaminated glasses (x ≤ 60), while the Pb-O bond also acquires covalent character for x ≥ 70 mol%.
{"title":"Structural aspects of lead borate glasses prepared in platinum and alumina crucibles","authors":"Elizabeth M. Tsekrekas , Nagia S. Tagiara , Randall E. Youngman , Efstratios I. Kamitsos , Alexis G. Clare","doi":"10.1016/j.jnoncrysol.2025.123521","DOIUrl":"10.1016/j.jnoncrysol.2025.123521","url":null,"abstract":"<div><div>Lead borate glasses in the system xPbO-(100-x)B<sub>2</sub>O<sub>3</sub> have been prepared in platinum and alumina crucibles. Glasses were investigated qualitatively by Raman and infrared spectroscopies, and quantitatively by NMR spectroscopy, to determine the effect of Al<sub>2</sub>O<sub>3</sub> contamination on the glass network. Glasses melted in a platinum crucible had a formation range of 30 ≤ <em>x</em> ≤ 80 mol% PbO, while glasses prepared in alumina crucibles experienced an expansion in the formation range, i.e. 20 ≤ <em>x</em> ≤ 85 mol%, as a result of Al<sub>2</sub>O<sub>3</sub> contamination from the alumina crucible. Both the mid-frequency Raman and infrared data, as well as NMR spectroscopy, suggest that the introduction of Al<sub>2</sub>O<sub>3</sub> within the glass results in the under-modification of the borate network due to the formation of anionic AlO<sub>n</sub> type units charge balanced by Pb<sup>2+</sup> ions. This is also reflected in the low-frequency region of the Raman and infrared spectra, which relates to the Pb-O vibrations, where the Pb-O bonding remains predominately ionic for a larger composition range in the Al<sub>2</sub>O<sub>3</sub> contaminated glasses (<em>x</em> ≤ 60), while the Pb-O bond also acquires covalent character for <em>x</em> ≥ 70 mol%.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"659 ","pages":"Article 123521"},"PeriodicalIF":3.2,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143833712","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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