Characterization and crystallization kinetics of Er-doped Li2O–Y2O3–P2O5 glass studied by non-isothermal DSC analysis

Zemenová, Petra; Král, Robert; Nitsch, K.; Knı́žek, K.; Cihlář, A.; Bystřický, Aleš

doi:10.1007/s10973-016-5730-1

Cited by 8 publications

(2 citation statements)

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“…The crystallisation kinetics and ionic conductivity of yttrium phosphate glasses have been reported [41][42][43][44]. Petra et al studied crystallisation kinetics of erbiumdoped yttrium phosphate glasses for scintillation applications [45] by exploring the effect of particle sizes in both powder and bulk samples. They found that the activation energy decreased from 193 to 180 kJ/mol with increasing particle size.…”

Section: Introductionmentioning

confidence: 99%

Yttrium doped phosphate-based glasses: structural and degradation analyses

et al. 2020

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This study investigates the role of yttrium in phosphate-based glasses in the system 45(P2O5)–25(CaO)– (30-x)(Na2O)–x(Y2O3) (0≤x≤5) prepared via melt quenching and focuses on their structural characterisation and degradation properties. The structural analyses were performed using a combination of solid-state nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). 31P NMR analysis showed that depolymerisation of the phosphate network occurred which increased with Y2O3 content as metaphosphate units (Q2) decreased with subsequent increase in pyrophosphate species (Q1). The NMR results correlated well with structural changes observed via FTIR and XPS analyses. XRD analysis of crystallised glass samples revealed the presence of calcium pyrophosphate (Ca2P2O7) and sodium metaphosphate (NaPO3) phases for all the glass formulations explored. Yttrium-containing phases were found for the formulations containing 3 and 5 mol% Y2O3. Degradation analyses performed in Phosphate buffer saline (PBS) and Milli-Q water revealed significantly reduced rates with addition of Y2O3 content. This decrease was attributed to the formation of Y-O-P bonds where the octahedral structure of yttrium (YO6) cross-linked phosphate chains, subsequently leading to an increase in chemical durability of the glasses. The ion release studies also showed good correlation with the degradation profiles.

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Section: Introductionmentioning

confidence: 99%

Yttrium doped phosphate-based glasses: structural and degradation analyses

et al. 2020

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“…Limited studies have been reported on the crystallization behavior of yttrium phosphate glasses. Petra et al studied on crystallization kinetics of erbium‐doped yttrium phosphate glasses based on particle size of the powder and bulk sample …”

Section: Introductionmentioning

confidence: 99%

Thermal and crystallization kinetics of yttrium‐doped phosphate‐based glasses

Arafat

Samad

Wadge

et al. 2019

Int J of Appl Glass Sci

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Yttrium‐doped glasses have been utilized for biomedical applications such as radiotherapy, especially for liver cancer treatment. In this paper, the crystallization behavior of phosphate‐based glasses doped with yttrium (in the system 45P2O5–(30 − x) Na2O–25CaO–xY2O3—where x = 0, 1, 3 and 5) have been investigated via Differential Scanning Calorimetry (DSC) using nonisothermal technique at different heating rates (5°C, 10°C, 15°C and 20°C/min). The glass compositions were characterized via EDX, XRD, Density and Molar volume analysis. The Moynihan and Kissinger methods were used for the determination of glass transition activation energy (Eg) which decreased from 192 to 118 kJ/mol (Moynihan) and 183 to 113 kJ/mol (Kissinger) with increasing yttrium oxide content. Incorporation of 0 to 5 mol% Y2O3 revealed an approximate decrease of 71 kJ/mol (Ozawa and Augis) for onset crystallization (Ex) and 26 kJ/mol (Kissinger) for crystallization peak activation energies (Ec). Avrami index (n) value analyzed via Matusita–Sakka equation suggested a one‐dimensional crystal growth for the glasses investigated. SEM analysis explored the crystalline morphologies and revealed one‐dimensional needle‐like crystals. Overall, it was found that these glass formulations remained amorphous with up to 5 mol% Y2O3 addition with further increases in Y2O3 content resulting in significant crystallization.

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