Challenges in the crystal growth of Li2CuO2 and LiMnPO4
Challenges in the crystal growth of Li2CuO2 and LiMnPO4
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DOI：
10.1016/j.jcrysgro.2010.10.029
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发表时间：
2011-03-01
影响因子：
1.8
通讯作者：
Klingeler, Ruediger
中科院分区：
文献类型：
--
作者：
Wizent, Nadja;Behr, Guenter;Klingeler, Ruediger
在新设计的具有光学加热的垂直浮区装置中，在高压下生长了潜在的电池材料LiMnPO4和自旋梯形化合物Li2CuO2的单晶。锂的蒸发及其与生长室中气体的反应是生长过程中的主要挑战。在LiMnPO4的流动溶剂浮区生长过程中，通过施加40bar的高气压，使蒸发量减少了数量级。在生长过程中，透过透明熔体的光辐射会影响晶体/熔体界面的曲率。研究发现，生长方向对界面曲率由凹变凸以及实现高效的晶界选择具有决定性作用。利用Ar/O-2混合气体生长Li2CuO2晶体，控制大气中氧气与浮区氧的直接交换，控制熔体中的氧含量，最终控制Li2CuO2晶体的质量。(C)2010爱思唯尔B.V.保留所有权利。
Single crystals of a potential battery material, LiMnPO4, and the spin ladder compound Li2CuO2 are grown under elevated gas pressure in a newly designed vertical floating zone facility with optical heating. Lithium vaporization and its reaction with gases in the growth chamber are principal challenges of the growth process. By applying high argon pressure of 40 bar during Travelling Solvent Floating Zone growth of LiMnPO4 the vaporization was reduced by orders of magnitude. The optical radiation, penetrating the transparent melt, affects the crystal/melt interface curvature during the growth. The growth direction was recognized to be decisive for changing the interface curvature from concave to convex and enabling efficient grain selection. By using an Ar/O-2 gas mixture in crystal growth of Li2CuO2 the direct exchange between oxygen in the atmosphere and the floating zone, the oxygen content of the melt and finally the quality of Li2CuO2 crystals are controlled. (C) 2010 Elsevier B.V. All rights reserved.