Cerium Concentration and Sintering Atmosphere Influence on Y2.98–xCexAl5.02O12 Ceramic Phase Composition and Luminescence

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, CERAMICS Glass and Ceramics Pub Date : 2023-12-27 DOI:10.1007/s10717-023-00631-4

F. F. Malyavin, V. A. Tarala, A. A. Kravtsov, D. S. Vakalov, L. V. Kozhitov, V. A. Lapin, D. T. Dziov, E. V. Medyanik, L. V. Tarala, V. E. Suprunchuk

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Abstract

The phase composition and spectral-luminescent properties of samples of a luminescent ceramic, based on oxide compositions with makeup described by the general formula Y_2.98_–xCe_xAl_5.02O₁₂, where x = 0.05, 0.10, 0.20, 0.30, 0.45, and 0.60 formula units (f.un), were investigated. It is demonstrated that the phase composition of ceramic powders depends substantially on the cerium concentration and the calcination atmosphere. It was ascertained that the maximum concentration of cerium cations in the garnet lattice on calcination in air is equal to about 0.1 f.un, and in an argon and hydrogen atmosphere approximately 0.16 f.un The photoluminescence of ceramic samples excited by a 445 nm laser was investigated. It is shown that ceramic samples obtained by sintering in argon and hydrogen have a higher luminescence intensity compared to samples synthesized in vacuum. The possibility of shifting the wavelength of the maximum luminescence intensity from 546 to 570 nm by changing the cation composition and the sintering conditions of the ceramics was demonstrated. It is shown that oxidative annealing of ceramic samples adversely affects the intensity and position of luminescence maxima in highly cerium-doped oxide compositions Y_2.98–xC_exAl_5.02O₁₂.

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铈浓度和烧结气氛对 Y2.98-xCexAl5.02O12 陶瓷相组成和发光的影响

研究了基于氧化物成分的发光陶瓷样品的相组成和光谱发光特性，氧化物成分的组成按通式 Y2.98-xCexAl5.02O12（其中 x = 0.05、0.10、0.20、0.30、0.45 和 0.60 式单位 (f.un)）描述。结果表明，陶瓷粉末的相组成在很大程度上取决于铈浓度和煅烧气氛。研究发现，在空气中煅烧时，石榴石晶格中铈阳离子的最大浓度约为 0.1 f.un，而在氩气和氢气环境中约为 0.16 f.un。结果表明，与在真空中合成的样品相比，在氩气和氢气中烧结得到的陶瓷样品具有更高的发光强度。通过改变陶瓷的阳离子成分和烧结条件，证明了将最大发光强度的波长从 546 纳米转移到 570 纳米的可能性。研究表明，陶瓷样品的氧化退火会对高掺铈氧化物成分 Y2.98-xCexAl5.02O12 的最大发光强度和位置产生不利影响。

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来源期刊

Glass and Ceramics 工程技术-材料科学：硅酸盐

CiteScore

1.00

自引率

16.70%

发文量

审稿时长

6-12 weeks

期刊介绍： Glass and Ceramics reports on advances in basic and applied research and plant production techniques in glass and ceramics. The journal''s broad coverage includes developments in the areas of silicate chemistry, mineralogy and metallurgy, crystal chemistry, solid state reactions, raw materials, phase equilibria, reaction kinetics, physicochemical analysis, physics of dielectrics, and refractories, among others.