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Crystal Growth and Elemental Homogeneity of the Multicomponent Rare-Earth Garnet (Lu1/6Y1/6Ho1/6Dy1/6Tb1/6Gd1/6)3Al5O12
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2020-09-02 , DOI: 10.1021/acs.cgd.0c00887 Matheus Pianassola 1, 2 , Madeline Loveday 1, 2 , Bryan C. Chakoumakos 3 , Merry Koschan 1 , Charles L. Melcher 1, 2, 4 , Mariya Zhuravleva 1, 2
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2020-09-02 , DOI: 10.1021/acs.cgd.0c00887 Matheus Pianassola 1, 2 , Madeline Loveday 1, 2 , Bryan C. Chakoumakos 3 , Merry Koschan 1 , Charles L. Melcher 1, 2, 4 , Mariya Zhuravleva 1, 2
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High-entropy aluminum garnets were grown as bulk single crystals using the micro-pulling-down method, taking the synthesis of complex ceramics a step further from the conventional preparation of polycrystalline materials. We studied the effects of growth parameters on the elemental distribution in high optical quality crystals of (Lu1/6Y1/6Ho1/6Dy1/6Tb1/6Gd1/6)3Al5O12 containing six cations (yttrium and rare-earths) taken in equimolar amounts. A single garnet structure was confirmed by powder X-ray diffraction. Electron microprobe measurements were obtained to correlate the radial distribution of rare-earth elements with pulling rates and molten zone height. The nature of the elemental distribution in the radial direction was associated with ionic radius: smaller rare-earths concentrated in the center of the crystal, while larger rare-earths segregated toward the outer edge of the cylindrical crystal. Faster pulling rates led to a flattening of the concentration profiles toward the nominal concentration, promoting a more homogeneous radial elemental distribution, while varying the molten zone height did not have a significant effect. The demonstrated success with crystal growth enables the practical availability of single crystals of multicomponent aluminum garnets for further discovery of new phenomena and applications.
中文翻译：
多组分稀土石榴石的晶体生长和元素均质性（Lu 1/6 Y 1/6 Ho 1/6 Dy 1/6 Tb 1/6 Gd 1/6）3 Al 5 O 12
使用微下拉法将高熵的铝石榴石生长为块状单晶，这使得复合陶瓷的合成比传统的多晶材料的制备更进一步。我们研究了生长参数对（Lu 1/6 Y 1/6 Ho 1/6 Dy 1/6 Tb 1/6 Gd 1/6）3 Al 5 O 12的高光学品质晶体中元素分布的影响含有六个等摩尔量的阳离子（钇和稀土）。通过粉末X射线衍射确认单石榴石结构。获得电子探针测量值，以将稀土元素的径向分布与拉速和熔融区高度相关联。径向上元素分布的性质与离子半径有关：较小的稀土元素集中在晶体的中心，而较大的稀土元素则向圆柱形晶体的外边缘偏析。更快的提拉速度导致浓度曲线趋向于标称浓度平坦，促进了更均匀的径向元素分布，而改变熔融区高度并没有显着影响。
更新日期：2020-10-07
中文翻译：
多组分稀土石榴石的晶体生长和元素均质性（Lu 1/6 Y 1/6 Ho 1/6 Dy 1/6 Tb 1/6 Gd 1/6）3 Al 5 O 12
使用微下拉法将高熵的铝石榴石生长为块状单晶，这使得复合陶瓷的合成比传统的多晶材料的制备更进一步。我们研究了生长参数对（Lu 1/6 Y 1/6 Ho 1/6 Dy 1/6 Tb 1/6 Gd 1/6）3 Al 5 O 12的高光学品质晶体中元素分布的影响含有六个等摩尔量的阳离子（钇和稀土）。通过粉末X射线衍射确认单石榴石结构。获得电子探针测量值，以将稀土元素的径向分布与拉速和熔融区高度相关联。径向上元素分布的性质与离子半径有关：较小的稀土元素集中在晶体的中心，而较大的稀土元素则向圆柱形晶体的外边缘偏析。更快的提拉速度导致浓度曲线趋向于标称浓度平坦，促进了更均匀的径向元素分布，而改变熔融区高度并没有显着影响。
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