Czochralski growth and characterization of the multicomponent garnet (Lu1/4Yb1/4Y1/4Gd1/4)3Al5O12
Czochralski growth and characterization of the multicomponent garnet (Lu1/4Yb1/4Y1/4Gd1/4)3Al5O12
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DOI：
10.1103/physrevmaterials.5.083401
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发表时间：
2021-08-18
影响因子：
3.4
通讯作者：
Zhuravleva, Mariya
中科院分区：
文献类型：
--
作者：
Pianassola, Matheus;Stand, Luis;Zhuravleva, Mariya
这项工作证明了复杂的石榴石的实际可扩展的增长潜力，并评估的光学质量和元素分布的直拉晶体的多组分组合物的影响。我们的实验方法旨在阐明复杂的石榴石组成（Lu_（1/4）Yb_（1/4）Y_（1/4）Gd_（1/4））（3）Al_5 O_（12），晶体生长参数，晶体结构和元素均匀性之间的关系。我们的假设是，结合多个稀土（RE），将部分占据十二面体网站的铝石榴石结构将导致一个稳定的，单一的石榴石化合物，可以通过直拉法生长。单晶和粉末X-射线衍射表明，一个单一的石榴石相，从种子到尾部的晶胞体积增加。此外，我们建议，元素偏析的模式将基于每个组成RE的离子半径从多组分石榴石的平均RE离子半径的偏差。电子探针显微分析表明，小于该平均值的离子（Lu 3+和Yb 3+）优先纳入晶体中，而大于该平均值的元素（Gd 3+）被拒绝。Y ~（3+）的离子半径接近平均值，钇的偏析最小。四种稀土元素的浓度在晶锭末端接近化学计量。扫描电子显微镜和能量色散X射线能谱分析表明，富Gd夹杂物的共晶显微组织的末端的梨晶。
This work demonstrates the potential for practical scalable growth of complex garnets and evaluates the implications of a multicomponent composition in the optical quality and elemental distribution of a Czochralski-grown crystal. Our experimental approach was designed to elucidate the relation between a complex garnet composition (Lu1/4Yb1/4Y1/4Gd1/4)(3)Al5O12, crystal growth parameters, crystal structural, and elemental homogeneity. Our hypothesis is that combining multiple rare earths (REs) that will fractionally occupy the dodecahedral site in the aluminum garnet structure will result in a stable, single garnet compound that can be grown by the Czochralski method. Single-crystal and powder x-ray diffraction indicated a single garnet phase with an increasing unit cell volume from seed to tail. In addition, we propose that the pattern of elemental segregation will be based on the deviation of the ionic radius of each constituent RE from the average RE ionic radius of the multicomponent garnet. Electron probe microanalysis revealed that ions that are smaller than that average (Lu3+ and Yb3+) are preferentially incorporated in the crystal, while elements that are larger than that average (Gd3+) are rejected. The ionic radius of Y3+ is close to that average and yttrium segregation was minimal The concentrations of the four REs are closer to stoichiometric on the tail end of the boule. Scanning electron microscopy and energy-dispersive x-ray spectroscopy analysis reveal Gd-rich inclusions with eutectic microstructures in the tail end of the boule.