A.El Boubekri , M. Sajieddine , M. Lassri , M. Sahlaoui , A. Razouk , H. Lassri
{"title":"Investigation of critical phenomena and magnetocaloric effect (MCE) in amorphous Tb₈₀Au₂₀ foils","authors":"A.El Boubekri , M. Sajieddine , M. Lassri , M. Sahlaoui , A. Razouk , H. Lassri","doi":"10.1016/j.jnoncrysol.2025.123797","DOIUrl":"10.1016/j.jnoncrysol.2025.123797","url":null,"abstract":"<div><div>This work investigates the magnetic critical behavior and magnetocaloric effect (MCE) of an amorphous Tb₈₀Au₂₀ alloy. Rare-earth–based amorphous systems are of interest both for their unusual magnetic properties and their potential in energy-efficient cooling technologies. Magnetization measurements reveal a second-order transition from the ferromagnetic to the paramagnetic state at a Curie temperature of about 70 K. To characterize this transition, we determined the critical exponents (β, γ, δ, and n) using several complementary techniques: Modified Arrott plots (MAP), Kouvel–Fisher analysis (K-F), critical isotherm method (CIA), and Widom scaling relation (WSR): β = 0.395, γ = 1.064, δ = 3.03, and <em>n</em> ≈ 0.78. The values obtained are consistent across these approaches and closely follow the predictions of the mean-field model, indicating that long-range ferromagnetic interactions dominate in this amorphous compound. The magnetocaloric properties were also examined to validate the critical behavior. The alloy exhibits a maximum magnetic entropy change of approximately 2.30 J kg⁻¹ K⁻¹ and a relative cooling power of about 322 J kg⁻¹ under an applied field change of 0–4.5 T The broad temperature span of the entropy change, combined with the absence of thermal and magnetic hysteresis, confirms the advantages of second-order transitions. These findings highlight the potential of Tb-based amorphous alloys as promising candidates for cryogenic magnetic refrigeration.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"668 ","pages":"Article 123797"},"PeriodicalIF":3.5,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220524","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}
{"title":"Microstructure analysis of (CaO-SiO2)-xTiO2-based mold flux microstructures using in situ high temperature Raman spectroscopy","authors":"Hebin Jin, Huanhuan Song, Qiangqiang Wang, Shengping He, Xubin Zhang","doi":"10.1016/j.jnoncrysol.2025.123803","DOIUrl":"10.1016/j.jnoncrysol.2025.123803","url":null,"abstract":"<div><div>During continuous casting of high-Ti steels, conventional CaO-SiO<sub>2</sub>-based mold flux reacts strongly with molten steel, forming CaO-SiO<sub>2</sub>-TiO<sub>2</sub> slags. This transformation increases crystallinity and raises the melting and break temperatures, while reducing slag viscosity. Using rotational viscometry, XPS and in situ high-temperature Raman spectroscopy, this study clarified the structure-property relationships underlying these changes. Increasing the TiO<sub>2</sub>/SiO<sub>2</sub> mass ratio decreased viscosity from 0.42 Pa·s to 0.12 Pa·s, while increasing the melting temperature from 945 °C to 1187 °C and the break temperature from 1151 °C to 1212 °C. Slag morphology transitioned from a glass structure (N1, N2) to a crystals (N3) with high-melting-point perovskite (CaTiO<sub>3</sub>) precipitated. Structurally, increased TiO<sub>2</sub>/SiO<sub>2</sub> ratios depolymerized the silicate network, increasing non-bridging oxygen (NBO) and free oxygen (FO) content. At lower TiO<sub>2</sub> levels, TiO<sub>2</sub> acted as a network modifier, forming depolymerized [TiO<sub>6</sub>]<sup>8−</sup> octahedra associated with NBO. At higher contents, TiO<sub>2</sub> functioned as a network former, where <span><math><msubsup><mi>Q</mi><mrow><mi>S</mi><mi>i</mi></mrow><mn>2</mn></msubsup></math></span> and <span><math><msubsup><mi>Q</mi><mrow><mi>S</mi><mi>i</mi></mrow><mn>3</mn></msubsup></math></span> silicate structural units decreased and replaced by [TiO<sub>4</sub>]<sup>4−</sup> and [Ti<sub>2</sub>O<sub>6</sub>]<sup>4−</sup> clusters, forming complex Ti-O networks. These Ti-O units, with larger volumes and lower bond energies than Si-O tetrahedra, created wider structural gaps and edge-sharing configurations, facilitating oxygen ion occupancy rate, further increasing NBO and FO concentrations. This network depolymerization improved slag flowability, with the lowest viscosity observed in N3. However, rising [TiO<sub>6</sub>]<sup>8−</sup> octahedra content promoted perovskite nucleation, increasing slag crystallinity. This work provided critical theoretical insight for designing mold fluxes for high-Ti steel, targeting non-/low-reactivity and suppressed crystallization.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"668 ","pages":"Article 123803"},"PeriodicalIF":3.5,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220421","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}
Hongxiang Cui , Liming Xu , Yaoyao Peng , Yong Zhao , Bo Zhang , Wei-Hua Wang
{"title":"Effect of rare-earth elements microalloying on the glass-forming ability and soft magnetic properties of FeCoSiBCuRE (RE = Sc and Y) amorphous/nanocrystalline alloys","authors":"Hongxiang Cui , Liming Xu , Yaoyao Peng , Yong Zhao , Bo Zhang , Wei-Hua Wang","doi":"10.1016/j.jnoncrysol.2025.123802","DOIUrl":"10.1016/j.jnoncrysol.2025.123802","url":null,"abstract":"<div><div>The effects of rare-earth (RE) elements microalloying on the glass-forming ability (GFA), thermal stability, and soft magnetic properties of FeCoSiBCuRE (RE = Sc and Y) amorphous/nanocrystalline alloys have been systematically investigated. Substituting Nb with 3 at. % Sc or Y significantly improved the GFA, enabling the formation of fully amorphous even at Fe contents up to 84 at. %. The addition of Y or Sc induces extra crystallization peaks of the metastable Fe<sub>3</sub>B phase, with crystallization temperatures of 850∼860 K for Y-microalloyed alloys and 896 K for Sc-microalloyed alloys. Furthermore, the annealing temperature windows were reduced by 87∼106 K and 32 K, respectively, and consequently thermal stability was weakened. The coercivity (<em>H</em><sub>c</sub>) of the alloy increased sharply after crystallization annealing, owing to the premature precipitation of the hard magnetic Fe<sub>3</sub>B phase and increased grain size. In contrast, stress‑relief annealing below the crystallization temperature produced a predominantly amorphous structure with exceptionally low <em>H</em><sub>c</sub>. Among the compositions studied, (Fe<sub>0.8</sub>Co<sub>0.2</sub>)<sub>83</sub>Si<sub>1</sub>B<sub>12</sub>Cu<sub>1</sub>Sc<sub>3</sub> alloy exhibits the most favorable magnetic properties, achieving a high saturation magnetic flux density (<em>B</em><sub>s</sub>) of 1.66 T and an ultralow <em>H</em><sub>c</sub> of 0.92 A/m. This outstanding performance is attributed to RE‑induced melt purification, improved ribbon surface quality, the elimination of domain‑wall pinning sites, and the formation of a uniaxially induced magnetic‑domain structure.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"668 ","pages":"Article 123802"},"PeriodicalIF":3.5,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220422","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}
Jikai Su , Ruixiang Liu , Shengnan Liu , Chang Ru , Xuemei Yan , Dong Su , Xiaolei Li
{"title":"Preparation of low-thermal-conductivity and high-strength GPTMS polymer cross-linked SiO₂ aerogels via a two-step modification method","authors":"Jikai Su , Ruixiang Liu , Shengnan Liu , Chang Ru , Xuemei Yan , Dong Su , Xiaolei Li","doi":"10.1016/j.jnoncrysol.2025.123798","DOIUrl":"10.1016/j.jnoncrysol.2025.123798","url":null,"abstract":"<div><div>Although recent studies on polymer cross-linking modification have improved the mechanical properties of SiO₂ aerogels, they often overlook thermal insulation performance, limiting broader applications. To achieve synergistic optimization of thermal and mechanical properties, this work employed tetraethyl orthosilicate (TEOS) as the silica source, (3-glycidyloxypropyl)trimethoxysilane (GPTMS) as the organic precursor, and diethylenetriamine (DETA) as the crosslinking agent; a two-step modification method combining precursor modification and hydrothermal aging was adopted, upon which DETA was further introduced into the aging solution to regulate the microstructure of the aerogels, and GPTMS polymer-crosslinked SiO₂ aerogels (GDSA) were ultimately obtained via ambient pressure drying. The study systematically explores the effects of the modification method and conditions on material structure and properties. Notably, the GDSA-50 sample, obtained via precursor modification and hydrothermal aging with 0.05 mol/L DETA, exhibits an low thermal conductivity of 0.0228 W·m⁻¹K⁻¹ and a high compressive strength of 1.829 MPa at 20 % strain. This work offers a novel route to developing polymer cross-linked aerogels with optimized thermal and mechanical properties, expanding their application prospects in high-performance thermal insulation.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"668 ","pages":"Article 123798"},"PeriodicalIF":3.5,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220523","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}
Jinxu Jiao , Zhaojin Zhong , Jiaxin Xu , Weiyong Dong , Hong Li , Junjie Zhou , Xiaobo Peng
{"title":"Preparation and Properties of Bi2O3-B2O3-ZnO Metal Sealing Glass","authors":"Jinxu Jiao , Zhaojin Zhong , Jiaxin Xu , Weiyong Dong , Hong Li , Junjie Zhou , Xiaobo Peng","doi":"10.1016/j.jnoncrysol.2025.123801","DOIUrl":"10.1016/j.jnoncrysol.2025.123801","url":null,"abstract":"<div><div>Low-temperature sealing represents a future development trend in the metal-glass sealing industry. This study investigated the effects of different Bi/B ratios and Cu/Zn ratios on the properties of Bi-B-Zn system glasses, and explored their sealing performance with stainless steel (SUS430) for the first time. The results showed that the upper limit of Bi₂O₃ content in the glass is 50%, with a maximum coefficient of thermal expansion (α) of 115×10⁻⁷/°C. Replacing ZnO with CuO can reduce the characteristic temperatures of the glass but increases its crystallization tendency. However, adding a small amount of CuO enhances the sealing strength between the glass and metal, achieving a sealing strength of 3.08 MPa. Additionally, the study found that during sealing at a low temperature of 470°C, ion penetration occurs between the metal and glass, forming a bonding layer with a thickness of approximately 3 μm. This research holds significant importance for advancing low-temperature sealing technology between metal and glass.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"668 ","pages":"Article 123801"},"PeriodicalIF":3.5,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220521","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}
{"title":"Influence of Ge Addition on physical, optical, and mechanical properties of S-Se-Pb chalcogenide glasses","authors":"Debtanu Patra , Dipankar Biswas , Preetinder Kaur , Kaushik Das , Rittwick Mondal , Nipu Modak","doi":"10.1016/j.jnoncrysol.2025.123799","DOIUrl":"10.1016/j.jnoncrysol.2025.123799","url":null,"abstract":"<div><div>A new series of Ge-incorporated chalcogenide S-Se-Pb glasses is synthesized by the melt-quenching technique. The amorphous nature of the synthesized compounds has been checked by X-ray diffraction. The measured density increases from (3.02-3.54)g.cm<sup>-3</sup> due to the incorporation of Ge atoms. The estimated optical energy band gap decreases from (2.04-1.71) eV, whereas the Urbach energy increases from (0.16- 0.35) eV, demonstrating the manifestation of structural disorder. The Wemple-Di Domenico model is deployed for the dispersion analysis. The complex dielectric constant, dissipation factor, and loss functions, i.e., VELF and SELF parameters, are computed and systematically interpreted. Elastic moduli of the studied glass samples are obtained from the measured longitudinal and transverse velocities. The study reveals an upsurge in longitudinal modulus from (22.87 – 37.85) GPa and Young’s modulus from (19.01-32.05) GPa with increasing Ge atoms. Theoretical values of elastic moduli acquired from Bond compression model are in agreement with the experimentally obtained results. The obtained findings suggest that among all the studied samples, the S<sub>(50−x)</sub>Se₄₀Pb₁₀Geₓ (x = 20) sample has the best optical features and highest mechanical stability, which can be used for optoelectronic applications.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"668 ","pages":"Article 123799"},"PeriodicalIF":3.5,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220520","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}
Artem A. Tsygankov, Bulat N. Galimzyanov, Anatolii V. Mokshin
{"title":"Atomic bonding in equilibrium single-component melts. The cases of arsenic, antimony and bismuth","authors":"Artem A. Tsygankov, Bulat N. Galimzyanov, Anatolii V. Mokshin","doi":"10.1016/j.jnoncrysol.2025.123791","DOIUrl":"10.1016/j.jnoncrysol.2025.123791","url":null,"abstract":"<div><div>In liquid pnictogens, quasi-stable structures can be formed near melting temperature. The nature of their stability does not have the unified point of view. In the present work, the task of determining the degree of atomic bonding in these structures is solved using the Crystal Orbital Hamilton Population (COHP) method. The original results of <em>ab-initio</em> simulation of arsenic, antimony and bismuth melts near their melting temperatures are used. It is shown that the features of the electron interaction at the level of <span><math><mi>p</mi></math></span>-orbitals determine the characteristic bond lengths and angles between atoms. It has been established that the stability of structures decreases according to a power law with an increase in the atomic mass of a chemical element and the number of atoms in the structure. The obtained results clarify the understanding the mechanisms of formation of quasi-stable structures in pnictogen melts from first principles.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"668 ","pages":"Article 123791"},"PeriodicalIF":3.5,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220522","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}
XiShun Zhang , Yang Lv , TianXu Zhao , YuFeng Liang , Yikebali Aman , ZhiLiang Ning , Jianfei Sun , YongJiang Huang
{"title":"The deformation behaviors and structural evolution of a ZrCuNiAl bulk metallic glass during the blow molding","authors":"XiShun Zhang , Yang Lv , TianXu Zhao , YuFeng Liang , Yikebali Aman , ZhiLiang Ning , Jianfei Sun , YongJiang Huang","doi":"10.1016/j.jnoncrysol.2025.123790","DOIUrl":"10.1016/j.jnoncrysol.2025.123790","url":null,"abstract":"<div><div>In this study, the deformation behaviors and structural evolution of Zr<sub>44</sub>Ti<sub>11</sub>Cu<sub>10</sub>Ni<sub>10</sub>Be<sub>25</sub> (at. %) bulk metallic glasses (BMGs) at different deformation temperatures were investigated during blow molding. As the deformation temperature increased, the studied BMG exhibited enhanced formability, accompanied by pronounced strain non-uniformity. Higher deformation temperatures promoted crystallization of the studied BMG. The degree of crystallization varied in different regions of the deformed sample, with the top region showing the highest crystallization fraction, which can be attributed to strain-induced crystallization. The combined effects of thermal softening and crystallization-induced strain-hardening contributed to the elliptical shaping of the studied sample. These findings may offer theoretical guidance for optimizing the blow molding process of BMGs and thus promoting their industrial applications.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"668 ","pages":"Article 123790"},"PeriodicalIF":3.5,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220518","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}
{"title":"Impact of Bi₂O₃ doping on micro/nano-mechanical and dielectric properties of Fe₂O₃–P₂O₅–V₂O₅ quaternary glass systems","authors":"Dipankar Biswas , Mirgender Kumar , Rohit Kumar Singh Gautam , Vikas Mittal , Souvik Brahma Hota , Rittwick Mondal","doi":"10.1016/j.jnoncrysol.2025.123794","DOIUrl":"10.1016/j.jnoncrysol.2025.123794","url":null,"abstract":"<div><div>This paper thoroughly investigates the synergistic effects of Bi<sub>2</sub>O<sub>3</sub> incorporation on adjusting the mechanical and dielectric properties of Fe<sub>2</sub>O<sub>3</sub>-P<sub>2</sub>O<sub>5</sub>-V<sub>2</sub>O<sub>5</sub> glasses prepared through the melt quenching method. The microhardness, nano-hardness, and dielectric properties of glasses with varying Bi<sub>2</sub>O<sub>3</sub> contents (<em>x</em> = 0, 0.1, 0.2, 0.3, and 0.4) were examined in detail to understand how temperature- and frequency-dependent network modifications are induced by Bi<sub>2</sub>O<sub>3</sub>. Evidence of enhanced micro- and nano-hardness in the developed glasses with Bi<sub>2</sub>O<sub>3</sub> addition was observed during mechanical testing. Microhardness ranges from 182 Hv at <em>x</em> = 0.0 to 766 Hv at <em>x</em> = 0.4, while nano-hardness varies from 191.52 Hv to 828.67 Hv, reflecting densification and improved atomic packing within the glass matrix. An improvement in elastic modulus with increasing Bi<sub>2</sub>O<sub>3</sub> content was also noted. These structural enhancements further influenced dielectric properties, revealing a correlation between structural stiffness and dielectric response. The dielectric constant (ε<sup>/</sup>) increased at low frequencies and remained stable with temperature, showing a 15 % rise at 413 K; dielectric loss (ε<sup>//</sup>) indicated effective dipole relaxation at low frequencies, with optimal performance at <em>x</em> = 0.3. Ionic mobility and energy barriers, evaluated through dielectric relaxation activation energy, decreased from 0.67 eV (<em>x</em> = 0.1) to 0.49 eV (<em>x</em> = 0.4). Electrical modulus plots confirmed non-Debye relaxation behaviour; loss modulus peaks shifted to higher frequencies with increased Bi<sub>2</sub>O<sub>3</sub> content. Overall, this research demonstrates that Bi<sub>2</sub>O<sub>3</sub> and Fe<sub>2</sub>O<sub>3</sub> enhance the mechanical stability and dielectric performance of the glass matrix due to their structural compatibility.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"668 ","pages":"Article 123794"},"PeriodicalIF":3.5,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220519","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}
Xiaoyu Hu , Yulei Xie , Ran Tao , Yanan Chen , Lingjun Zhou , Xiaoyang Che , Hongli Ma , Muzhi Cai
{"title":"Paradoxical hydrolytic degradation in GeO2-P2O5 glasses at high GeO2 content: A structural transition study","authors":"Xiaoyu Hu , Yulei Xie , Ran Tao , Yanan Chen , Lingjun Zhou , Xiaoyang Che , Hongli Ma , Muzhi Cai","doi":"10.1016/j.jnoncrysol.2025.123789","DOIUrl":"10.1016/j.jnoncrysol.2025.123789","url":null,"abstract":"<div><div>The GeO<sub>2</sub>-P<sub>2</sub>O<sub>5</sub>-based glass systems hold promise for advanced optical applications due to their high refractive index, excellent optical transparency, and tunable mechanical durability. Despite these advantages, phosphate-rich compositions face significant challenges from inherent hydrolytic instability caused by P-O bond cleavage under moisture. While moderate additions of GeO<sub>2</sub> (≤ 50 mol %) have been shown to enhance structural stability and preserve optical performance by forming robust Ge-O-P and Ge-O-Ge linkages, an unexpected decline in hydrolytic durability is observed at higher GeO<sub>2</sub> concentrations (> 55 mol %). This study systematically investigates this paradox across a compositional range of 45–75 mol % GeO<sub>2</sub> using Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), and X-ray photoelectron spectroscopy (XPS). Our findings reveal that increased GeO<sub>2</sub> content induces a structural transition from six-coordinated to four-coordinated Ge, which diminishes Ge-O-P bonds and P-O-P long polymer chains. This shift results in poor hydrolytic stability due to enhanced water molecule interactions and terminal P-OH bond formation. By elucidating these mechanisms, this study provides critical insights into optimizing GeO<sub>2</sub>-P<sub>2</sub>O<sub>5</sub> glass scanning electron microscope for applications in extreme environments, aligning empirical observations with mechanistic understanding.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"668 ","pages":"Article 123789"},"PeriodicalIF":3.5,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154926","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}