The influence of niobium on the structure of Nb2O5–ZnO–P2O5 glasses

Holubová, Jana; Černošek, Zdeněk; Hejda, Petr

doi:10.1016/j.jnoncrysol.2018.10.020

Cited by 13 publications

(10 citation statements)

References 30 publications

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“…With increasing Nb 2 O 5 content, T g increases continuously from 485 to 739°C due to the formation of stronger Nb‐O‐P and Nb‐O‐Nb linkages at the expense of weaker P‐O bonds. The increase in T g with the addition of Nb 2 O 5 in phosphate glasses is well documented in literature 2,4,6,7,11–13,16,17,19,20,22,24 and signifies that incorporation of niobium units progressively strengthens the glass network increasing its reticulation and thermal stability.…”

Section: Resultssupporting

confidence: 54%

Transport of potassium ions in niobium phosphate glasses

et al. 2021

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The influence of Nb2O5 on the structure and ionic conductivity of potassium phosphate glasses was investigated in glasses with composition xNb2O5–(100‐x)[0.45K2O–0.55P2O5], x = 10–47 mol%. The Raman spectra of glasses reveal a transition from predominantly orthophosphate to predominantly niobate glass network with increasing Nb2O5 content. In the glass structure, niobium forms NbO6 octahedra which are interlinked with phosphate units for the glass containing 10 mol% Nb2O5, but for higher Nb2O5 content they become mutually interconnected via Nb‐O‐Nb bonds. The transport of potassium ions was found to be strongly dependent on the structural characteristics of the glass network. While the mixed niobate‐phosphate glass network hinders the diffusion of potassium ions by providing traps that immobilize them and/or by blocking the conduction pathways, predominantly niobate glass network exhibits a rather facilitating effect which is evidenced in the trend of DC conductivity as well as in the features of the frequency‐dependent conductivity and typical hopping lengths of potassium ions.

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Section: Resultssupporting

confidence: 54%

Transport of potassium ions in niobium phosphate glasses

et al. 2021

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“…Pure phosphate matrixes exhibit high thermal expansion coefficients, high hygroscopicity, and low thermal stability against crystallization, which limit their use for certain optical applications. The insertion of transition metal oxides can improve these properties, as reported in niobium, zinc, tungsten, and molybdenum phosphate glasses. In addition, it can result in a significant decrease in the phonon energy, minimizing the nonradiative processes when doped with rare‐earth ions (RE) .…”

Section: Introductionmentioning

confidence: 76%

“…Recently, structural changes in phosphate glasses has been reported by the addition of WO 3 , Ta 2 O 5 , V 2 O 5 , TiO 2 , and Nb 2 O 5 . In fact, transition metal containing oxide glasses exhibit improved optical properties for photonic applications when compared with pure oxide glass formers .…”

Section: Introductionmentioning

confidence: 99%

Transparent glass and glass‐ceramic in the binary system NaPO₃‐Ta₂O₅

et al. 2019

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Transparent and homogeneous tantalum phosphate glasses were prepared in the binary system (100‐x)NaPO3‐xTa2O5 with x varying from 10 to 50 mol%. Thermal, structural, and optical properties, as well as crystallization mechanisms, were investigated by thermal analysis, X‐ray diffraction, Fourier‐transform infrared spectroscopy (FTIR) and Raman spectroscopies, optical absorption, transmission electron microscopy in terms of Ta2O5 content. FTIR and Raman results support the tantalum insertion in the phosphate chains with [TaO6] polyhedra cross‐linking the phosphate units. At higher Ta2O5 content, [TaO6] clusters are formed and connected to the phosphate network by P‐O‐Ta bonds. This structural evolution is in good agreement with the thermal features measured by differential scanning calorimetry (DSC) with a strong increase of the Tg temperatures up to 920°C, high thermal stability against crystallization for low Ta2O5 content and increasing of crystallization tendency for the most Ta‐concentrated samples. Besides, due to the progressive insertion of [TaO6] units, the precipitation of Na2Ta8O21 perovskite‐like phase was identified in the sample with 50 mol% of Ta2O5. The optimal heat treatment conditions were identified using DSC measurements and a transparent glass‐ceramic from 50NaPO3 to 50Ta2O5 composition was prepared. The obtaines glass‐ceramic has great potential for optical applications, such as host for rare‐earth ions, nonlinear optical materials, and ferroelectric domain.

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“…Niobium is also part of bioactive glasses, as it was determined that Nb 5+ ions enhance calcification of bones and the differentiation of osteoblast like cells 14,15 . It is generally accepted that the coordination number of niobium changes with the composition of the glass 16 . In ZnO‐Nb 2 O 5 ‐P 2 O 5 glass, niobium is thought to form the niobyl(3+) cation (NbO 3+ ), which enters deformed polyhedra (octahedra, tetragonal pyramids) with a coordination‐covalent bond to oxygen 16,17 …”

Section: Introductionmentioning

confidence: 99%

“…It is generally accepted that the coordination number of niobium changes with the composition of the glass 16 . In ZnO‐Nb 2 O 5 ‐P 2 O 5 glass, niobium is thought to form the niobyl(3+) cation (NbO 3+ ), which enters deformed polyhedra (octahedra, tetragonal pyramids) with a coordination‐covalent bond to oxygen 16,17 …”

Section: Introductionmentioning

confidence: 99%

Thermodynamic model of ZnO‐Nb₂O₅‐P₂O₅ glasses – parameterization and validation

Liška¹,

Macháček

Chromčíková³

et al. 2021

Int J of Appl Glass Sci

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On the basis of experimental structural data ten system components were considered in the ZnO‐Nb2O5‐P2O5 thermodynamic model of Shakhmatkin and Vedishcheva – ZnO, Nb2O5, P2O5, ZnP4O11, Zn(PO3)2, Zn2P2O7, Zn3(PO4)2, NbO(PO3)3, (NbO)4(P2O7)3, and NbOPO4. The molar Gibbs energies of ZnO, Nb2O5, P2O5, and Zn3(PO4)2 were taken from the FACT database. The unknown Gibbs energies of the other components were estimated by minimizing the sum of squares of deviations between the calculated and measured equilibrium molar amounts of system components for the series xNb2O5·50ZnO·(50‐x)P2O5. The model was validated by the Multivariate Curve Resolution (MCR) and Malfait's analysis of Raman spectra of xNb2O5·(50‐x)ZnO·50P2O5 glasses. The MCR analysis performed for three components resulted in loadings that were in acceptable coincidence with partial Raman spectra obtained by Malfait's decomposition. Both the MCR and the Malfait's decomposition reproduced the experimental Raman spectra very well ‐ on the level of experimental error.

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The influence of niobium on the structure of Nb2O5–ZnO–P2O5 glasses

Cited by 13 publications

References 30 publications

Transport of potassium ions in niobium phosphate glasses

Transport of potassium ions in niobium phosphate glasses

Transparent glass and glass‐ceramic in the binary system NaPO₃‐Ta₂O₅

Thermodynamic model of ZnO‐Nb₂O₅‐P₂O₅ glasses – parameterization and validation

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The influence of niobium on the structure of Nb2O5–ZnO–P2O5 glasses

Cited by 13 publications

References 30 publications

Transport of potassium ions in niobium phosphate glasses

Transport of potassium ions in niobium phosphate glasses

Transparent glass and glass‐ceramic in the binary system NaPO3‐Ta2O5

Thermodynamic model of ZnO‐Nb2O5‐P2O5 glasses – parameterization and validation

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Product

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Transparent glass and glass‐ceramic in the binary system NaPO₃‐Ta₂O₅

Thermodynamic model of ZnO‐Nb₂O₅‐P₂O₅ glasses – parameterization and validation