Judd-Ofelt description of radiative properties of YNbO4 activated with different Eu3+ concentrations

Far, Ljubica Đačanin; Ćirić, Aleksandar; Sekulić, Milica; Periša, Jovana; Ristić, Zoran; Antić, Željka; Dramićanin, Miroslav D.

doi:10.1016/j.ijleo.2022.170398

Cited by 3 publications

(1 citation statement)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, yttrium was taken as a representative rare-earth ion, and yttrium orthoniobate was chosen as a model rare-earth orthoniobate. Yttrium orthoniobate is a promising optical host for rare-earth ions because yttrium ions are easily replaced in any proportion by other rare-earth ions with similar ionic radii [7][8][9][10][11][12][13][14][15]. It should be noted that yttrium orthoniobate itself is distinguished by the combination of promising luminescent, chemical, and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Phase Transformations upon Formation of Transparent Lithium Alumosilicate Glass-Ceramics Nucleated by Yttrium Niobates

et al. 2023

View full text Add to dashboard Cite

Phase transformations in the lithium aluminosilicate glass nucleated by a mixture of yttrium and niobium oxides and doped with cobalt ions were studied for the development of multifunctional transparent glass-ceramics. Initial glass and glass-ceramics obtained by isothermal heat-treatments at 700–900 °C contain YNbO4 nanocrystals with the distorted tetragonal structure. In samples heated at 1000 °C and above, the monoclinic features are observed. High-temperature X-ray diffraction technique clarifies the mechanism of the monoclinic yttrium orthoniobate formation, which occurs not upon high-temperature heat-treatments above 900 °C but at cooling the glass-ceramics after such heat-treatments, when YNbO4 nanocrystals with tetragonal structure undergo the second-order transformation at ~550 °C. Lithium aluminosilicate solid solutions (ss) with β-quartz structure are the main crystalline phase of glass-ceramics prepared in the temperature range of 800–1000 °C. These structural transformations are confirmed by Raman spectroscopy and illustrated by SEM study. The absorption spectrum of the material changes only with crystallization of the β-quartz ss due to entering the Co2+ ions into this phase mainly in octahedral coordination, substituting for Li+ ions. At the crystallization temperature of 1000 °C, the Co2+ coordination in the β-quartz solid solutions changes to tetrahedral one. Transparent glass-ceramics have a thermal expansion coefficient of about 10 × 10−7 K−1.

show abstract