Cerium‐doped yttrium aluminum garnets (Y_3‐xCe_xAl₅O₁₂, Ce:YAGs) are promising yellow light‐emitting components of solid‐state white light‐emitting diodes. Although there have been numerous studies examining the effects of Ce concentrations on the luminescent properties of Y_3‐xCe_xAl₅O_12, the impacts of Ce dopant on the elastic and thermodynamic properties are not well understood. In this work, we used resonant ultrasound spectroscopy (RUS) to determine the effects of Ce doping (0.025, 0.1, 1 at. %) on the elastic and thermodynamic properties of Y_3‐xCe_xAl₅O₁₂. The elastic moduli calculated via the Voigt–Reuss–Hill (VRH) method demonstrated that low Ce dopant concentrations (≤0.1 at. %) induced negligible effects on the elasticity of the YAG host matrix, while a high Ce concentration (1 at. %) yielded significant softening. RUS spectral analysis and SEM images suggested that the elastic softening originated from microstructural differences induced at higher Ce dopant concentrations. In addition, we demonstrated an increase in elastic anisotropy at higher Ce concentrations, which further elucidated the correlations between structure and elasticity of Y_3‐xCe_xAl₅O₁₂. Debye temperatures (θ_D), heat capacities (C_p), and thermal conductivities (κ) were calculated for Ce:YAGs through the relations of RUS‐derived parameters (sound velocities, elastic moduli) and previously determined thermal expansion coefficients. Ce:YAG was found to have a significant reduction in θ_D, C_p, and κ at Ce concentrations ≥1 at. %. Lastly, extrapolation of C_p and κ to higher temperatures allowed the modeling of thermal stress experienced by Y_3‐xCe_xAl₅O₁₂ disks up to 1073.15 K.

中文翻译：

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铈掺杂钇铝石榴石的弹性和热力学性质

铈掺杂的钇铝石榴石（Y _{3- x} Ce _x Al ₅ O ₁₂，Ce：YAGs）是固态白色发光二极管的有希望的黄色发光成分。尽管有大量研究研究了Ce的浓度对Y _{3‐ x} Ce _x Al ₅ O ₁₂发光性质的影响_，但对Ce掺杂物对弹性和热力学性质的影响尚不甚了解。在这项工作中，我们使用共振超声光谱（RUS）来确定Ce掺杂（0.025、0.1、1 at。％）对Y _{3‐ x} Ce _x的弹性和热力学性质的影响。Al ₅ O ₁₂。通过Voigt-Reuss-Hill（VRH）方法计算的弹性模量表明，低Ce掺杂物浓度（≤0.1at。％）对YAG基质的弹性影响可忽略不计，而高Ce浓度（1 at。％） ）产生明显的软化作用。RUS光谱分析和SEM图像表明，弹性软化源自较高Ce掺杂物浓度引起的微观结构差异。此外，我们证明了在较高的Ce浓度下弹性各向异性会增加，这进一步阐明了Y _{3‐ x} Ce _x Al ₅ O _12的结构与弹性之间的相关性。德拜温度（θ _d），Ce：YAG的热容（C _p）和热导率（κ）是通过RUS派生的参数（声速，弹性模量）与预先确定的热膨胀系数之间的关系计算得出的。的Ce：YAG被发现具有在显著减少θ _d，Ç _p，和κ为Ce的浓度在≥1。％。最后，将C _p和κ外推到更高的温度可以对Y _{3‐ x} Ce _x Al ₅ O ₁₂盘承受的最高1073.15 K的热应力进行建模。