Nd:YbVO_4激光晶体的生长及热学性质

Growth and Thermal Properties of Nd:YbVO_4 Crystal

用提拉法沿α轴和c轴成功生长出质量优良的Nd：YbVO4新型单晶。采用HRXRD-D5005型高分辨X射线衍射仪测得晶体的摇摆曲线，可以测得（400）面的半峰宽为70．92＂，（004）面的半峰宽为19．80＂。测得掺杂浓度为1％原子分数Nd：YbVO4晶体中Nd离子的有效分凝系数Keff为0．54。在298．15-573．15K温度范围内测量了晶体的热膨胀系数，αa=2．6×10^-6／K，αb=2．5×10^-6／K，αc=8．7×10^-6／K；测得比热值为0．45～0．65J／g·K。测量了晶体的热扩散系数α，从而得到了其热导率λ。

A new crystal Nd：YbVO4 has been successfully grown by the Czochralski method. The rocking curves from （004） and （400） diffraction planes of the as-grown Nd：YbVO4 crystal were measured by the high-resolution X-ray diffractometer （HRXRD）-D5005, and the full-width values at half-maximum were 19.80＂ for （004） face and 70. 92＂ for （400） face, respectively. The measured effective segregation eoefficients were 0.54 for Nd^3＋ and near 1 for V^3＋ and Yb^3＋ by the X-ray fluorescence method. The measured thermal expansion coefficients axe αa =2.6 × 10 ^-6/K , αb =2.5 × 10^-6/K and αc =8.7 × 10^-6/K from 298.15 to 573.15K along its crystallographic a ,b and c axes, respectively. The measured specific heat is 0. 45-0. 65J/g · K in the temperature range from 298.15 to 573.15K. The thermal diffusion coefficients of Nd：YbVO4 were measured and the thermal conductivities were also calculated.