Structural, optical and thermal properties of glass and anti-glass phases in strontium tellurite and borotellurite systems doped with europium. (October 2018)

• Record Type: Journal Article
• Authors: Kaur, Rajinder; Khanna, Atul; González-Barriuso, Marina; González, Fernando; Chen, Banghao
• Is Part Of: Materials research bulletin. Volume 106(2018)
• Page Start: 288
• Page End: 295
• Publication Date: 2018-10
• Subjects: Tellurite glasses and anti-glasses -- Thermal properties -- Te-O and B-O co-ordination -- Raman spectroscopy -- Rare-earth ions photo-luminescence -- B11 MAS-NMR; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2018.06.020
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: Optical, thermal and structural properties of SrO-TeO2 and SrO-B2 O3 -TeO2 glasses containing Eu 3+ . Co-existing glass and SrTe5 O11 anti-glass inclusions in 10SrO-90TeO2 sample. Rectangular, triangular, spherical and flower shaped inclusions in the samples. 1-mol% Eu2 O3 modifies the shape and size of the inclusions. B2 O3 suppresses the growth of anti-glass inclusions and enhances Eu 3+ fluorescence. Abstract: Glass sample of the composition: 10SrO-90TeO2 was prepared by melt-quenching technique and found to contain triangular, rectangular, and spherical shaped micro-inclusions of the average size ∼803 μm in the glassy matrix. The inclusions grow to an average size of ∼1347 μm and assume flower-like morphology upon adding 1 mol% Eu2 O3 in the 10SrO-90TeO2 sample. X-ray diffraction studies showed that the micro-inclusions exhibit sharp peaks, but their Raman spectra have broad phonon bands that are indistinguishable or very similar to that of the glassy matrix phase. The addition of 10 mol% B2 O3 in the samples inhibits the growth of inclusions of anti-glass phases and forms purely amorphous samples. B2 O3 significantly enhances the photoluminescence properties of Eu 3+ doped samples. Furthermore, B2 O3 converts the four-fold co-ordinated Te-O structural units into three-fold co-ordinated Te-O units.