掺钛蓝宝石晶体热学性质研究(英文)

Study on Thermal Properties of Titanium-doped Sapphire Crystal

本文系统分析了掺钛蓝宝石晶体的热学性质。在303．15—764．15K的温度范围内，晶体的主热膨胀系数分别为α1=3．8×10^-6K-1和α3=6．4×10-6K-1。298．15K时，晶体的比热为0．766J·g-1·K-1。采用激光脉冲法测试了晶体在303～570K温度范围内的热扩散率。掺钛蓝宝石晶体的主热导率分量＆与热力学温度r的函数关系通过拟合获得，为k1=-626．60772／（-2．52108T＋706．53622）＋5．96781和k3=-1347．76226／（-2．37632T＋616．40571）＋5．88351。

Abstract：The thermal properties of titanium-doped sapphire crystal were systematically analyzed. The principal thermal expansion coefficients were measured to be oq = 3.8×10-6 K-1 and a3 =6.4 ×10-6 K-1 over the temperature range of 303. 15-764. 15 K with a thermal dilatometer. The experimental specific heat was 0. 766 J·g-1 · K-1 at 298.15 K. The thermal diffusivity of the crystal was measured over the temperature range of 303-570 K for the first time through the laser flash method. Dependences of principal thermal conductivity components k on thermodynamic temperature T were fitted to be kI = - 626.60772/（ - 2. 52108T ＋ 706. 53622） ＋ 5. 96781 and k3 = - 1347. 76226/（ - 2. 37632T ＋ 616. 40571 ） ＋5. 88351.