INFLUENCE OF CERIUM CONCENTRATION AND SINTERING ATMOSPHERE ON THE PHASE COMPOSITION AND LUMINESCENT PROPERTIES OF Y2.98-хCeхAl5.02О12 CERAMICS

F. Malyavin, V. Tarala, A. A. Kravtsov, D. Vakalov, L. Kozhitov, V. 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 ceramic samples obtained from oxide compositions with the general formula Y2.98-хCeхAl5.02О12 (x = 0.05, 0.10, 0.20, 0.30, 0.45, 0.60 formula units (f.u.)) were investigated. It was found that the phase composition of the ceramic powders depended significantly on the concentration of cerium and the calcination atmosphere. The maximum concentration of cerium cations in the garnet lattice was determined to be approximately 0.1 f.u. when calcined in air, and approximately 0.16 f.u. when calcined in the argon – hydrogen atmosphere. The photoluminescence of the ceramic samples was studied when excited by a laser with a wavelength of 445 nm. It was observed that ceramic samples sintered in argon and hydrogen had a higher luminescence intensity compared to samples synthesized in a vacuum. The possibility of shifting the wavelength of the maximum luminescence intensity from 546 nm to 570 nm by changing the cationic composition and sintering conditions of the ceramics was demonstrated. Additionally, the negative effect of oxidative annealing of ceramic samples on the intensity and position of luminescence maxima in Y2.98-хCeхAl5.02О12 oxide compositions heavily doped with cerium was shown.
铈浓度和沉降大气环境对 Y2.98-хCeхAl5.02О12 陶瓷相组成和发光特性的影响
研究了由通式为 Y2.98-хCeхAl5.02О12 (x = 0.05, 0.10, 0.20, 0.30, 0.45, 0.60 式单位 (f.u.)) 的氧化物组成的陶瓷样品的相组成和光谱-发光特性。研究发现,陶瓷粉末的相组成在很大程度上取决于铈的浓度和煅烧气氛。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.u.,在氩氢气氛中煅烧时约为 0.16 f.u.。在波长为 445 纳米的激光激发下,对陶瓷样品的光致发光进行了研究。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的陶瓷样品具有更高的发光强度。实验证明,通过改变陶瓷的阳离子成分和烧结条件,可以将最大发光强度的波长从 546 纳米转移到 570 纳米。此外,在大量掺杂铈的 Y2.98-хCeхAl5.02О12 氧化物成分中,陶瓷样品的氧化退火对发光最大值的强度和位置有负面影响。
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