Anisotropy of thermal conductivities in non- and Mg-doped near-stoichiometric LiTaO3 crystals
Anisotropy of thermal conductivities in non- and Mg-doped near-stoichiometric LiTaO3 crystals
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DOI：
10.1016/j.optmat.2010.04.041
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发表时间：
2010-09-01
影响因子：
3.9
通讯作者：
Kitamura, Kenji
中科院分区：
文献类型：
--
作者：
Nakamura, Masaru;Takekawa, Shunji;Kitamura, Kenji
我们研究了室温下未掺杂的近化学计量比LiTaO 3（LiTaO 3）和掺杂Mg（1 mol%）的近化学计量比LiTaO 3（Mg：LiTaO 3）晶体沿着X轴、Y轴和Z轴的热导率。对未掺杂的同成分LiTaO 3（CLT）晶体沿沿着相同轴向的非化学计量比缺陷的影响也进行了估算。通过使用激光闪光法测量热扩散率并使用差示扫描量热计测量比热来确定热导率。发现所有三种晶体的热导率各向异性。即，沿着X轴的导热率与沿沿着Y轴的导热率相同，但小于沿沿着Z轴的导热率。晶体的热导率最高，是CLT晶体的两倍。Mg：MgO晶体的热导率略低于MgO晶体的热导率，这显然是由于Mg的掺杂。我们还研究了畴结构的差异对热导率的影响，使用随机分布的多畴的Mg：Mg晶体生长，发现它不影响沿沿着任何轴的热导率。这些研究结果的热导率应是有用的设计高功率激光器的应用，使用MgCl2和Mg：MgCl2晶体。(c)2010爱思唯尔有限公司版权所有。
We investigated investigated the thermal conductivities of non-doped near-stoichiometric LiTaO3 (SLT) and Mg (1 mol%)-doped near-stoichiometric LiTaO3 (Mg:SLT) crystals along the X-, Y-, and Z-axes at room temperature. Those of non-doped congruent LiTaO3 (CLT) crystal along the same axes were also estimated to investigate the effect of non-stoichiometric defects. The thermal conductivities were determined by measuring the thermal diffusivity using a laser-flash method and measuring the specific heat using a differential scanning calorimeter. Anisotropy of the thermal conductivities was found for all three crystals. That is, the thermal conductivities along the X-axis were the same as those along the Y-axis and less than those along the Z-axis. The thermal conductivities of the SLT crystal were the highest and were twice those of the CLT crystal. The thermal conductivities of the Mg:SLT crystal were slightly lower than those of the SLT crystal apparently due to the Mg-doping. We also investigated the effect of the difference in domain structure on thermal conductivity using as-grown Mg:SLT crystal with randomly distributed multi-domains and found that it did not affect the thermal conductivity along any axis. These findings regarding thermal conductivity should be useful for designing high-power laser applications using SLT and Mg:SLT crystals. (c) 2010 Elsevier B.V. All rights reserved.