Growth and thermal properties of tetragonal double tungstate KLa(WO4)2 crystal
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- 作者：Tongqing Sun ; Xiaodong Zhou ; Yu Zhang ; Shaolin Chen ; Shiguo Liu ; Yongfa Kong ; Jingjun Xu
- 关键词：A. Inorganic compounds ; B. Crystal growth ; D. Specific heat ; D. Thermal conductivity ; D. Thermal expansion
- 刊名：Materials Research Bulletin
- 出版年：2012
- 出版时间：November, 2012
- 年：2012
- 卷：47
- 期：11
- 页码：3233-3237
- 全文大小：630 K
文摘
An uncracked single crystal of double tungstate KLa(WO4)2 with the tetragonal scheelite structure has been successfully grown by the modified Czochralski method. For the first time, the thermal properties of this crystal, including the specific heat, thermal expansion, and thermal conductivity, were systematically investigated. The specific heat of the KLa(WO4)2 crystal changes slightly from 0.333 J g?1 K?1 to 0.394 J g?1 K?1 over the temperature range from 25 ¡ãC to 500 ¡ãC. The average linear expansion coefficients are ¦Á1 = 14.3 ¡Á 10?6 K?1 and ¦Á3 = 29.3 ¡Á 10?6 K?1. The anisotropy of the thermal expansion is explained from the point of view of crystal structure. The calculated thermal conductivities are 1.056 W m?1 K?1 and 1.174 W m?1 K?1 along the a- and c-axes, respectively. Compared with other double tungstate crystals, the KLa(WO4)2 crystal has a relatively low anisotropy of thermal expansion, as well as good thermal characteristics, and is suitable as a promising disordered laser host.