Determination of thermal, elastic, optical and lattice parameters of GdCOB single crystals doped with Nd3+ and Yb3+ ions
Determination of thermal, elastic, optical and lattice parameters of GdCOB single crystals doped with Nd3+ and Yb3+ ions
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DOI：
10.1016/j.jallcom.2009.03.070
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发表时间：
2009-07
影响因子：
6.2
通讯作者：
A. Kaźmierczak-Bałata;J. Bodzenta;P. Szperlich;K. Wokulska-;J. Kucytowski;T. Łukasiewicz;W. Hofman
中科院分区：
文献类型：
--
作者：
A. Kaźmierczak-Bałata;J. Bodzenta;P. Szperlich;K. Wokulska-;J. Kucytowski;T. Łukasiewicz;W. Hofman
本工作的目的是测定钆钙氧硼酸盐GdCa_4O（BO_3）_3（GdCOB）单晶的热、弹性、光学和晶格参数。热扩散率的测量是通过热波法使用的信号检测的基础上的海市蜃楼效应。该实验是通过脉冲回波法进行超声波速度测量完成的。吸收系数由经典的透射和反射光谱获得，晶格参数由Bond方法测量。研究了三种GdCOB单晶，一种是纯的，一种是掺杂4at.%的掺钕7at.%的Yb。样品通过Czochralski技术生长。实验结果表明，一个明确的各向异性的热或弹性性能的晶体符合其单斜结构。掺杂导致热扩散率降低，而超声速度几乎保持不变。Nd和Yb掺杂也导致晶格参数的增加。
The aim of this work is the determination of thermal, elastic, optical and lattice parameters of gadolinium calcium oxoborate GdCa4O(BO3)3(GdCOB) single crystals. The thermal diffusivity was measured by the thermal wave method using a signal detection based on the mirage effect. This experiment was completed with ultrasonic velocity measurements performed by the pulse echo method. The absorption coefficient was acquired from the classical transmission and reflection spectroscopy, while the lattice parameters were measured using the Bond's method. Three GdCOB single crystals were investigated, a pure single crystal, the one doped with 4at.% of Nd and single crystal doped with 7at.% of Yb. The samples were grown by the Czochralski technique. Experimental results revealed a clear anisotropy of either thermal or elastic properties of the crystals conforming their monoclinic structure. Doping led to decrease in the thermal diffusivity, while the ultrasound velocity remained practically unchanged. Both Nd and Yb dopants caused also the increase of lattice parameters.