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Thermophysical properties of a new nonlinear optical Na_3La _9O_3(BO_3)_8 crystal

机译:新型非线性光学Na_3La _9O_3(BO_3)_8晶体的热物理性质

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New nonlinear crystal Na_3La_9O_3(BO _3)_8 (NLBO) with good optical quality and weighing 45 g with size of 38 × 30 × 20 mm~3 has been grown by the optimized top-seeded solution growth (TSSG) method. Thermophysical properties including melting point, specific heat, thermal expansion, thermal diffusion, and hardness were performed on the crystal to determine thermal behaviors along different crystallographic axes. The specific heat was measured to be 0.45-0.70 J·g~(-1)·K~(-1) in the temperature range from 20 to 300 °C, which is lower than that of β-BaB_2O _4(BBO), LiB_3O_5 (LBO), and CsLiB _6O_(10) (CLBO). The Vickers hardness were measured to be 1052.67 kg/mm~2 for (100) and 1239.67 kg/mm~2 for (001) faces, which are greater than most of the commonly used borate crystals such as BBO, LBO, CsB_3O_5 (CBO), BiB_3O_6 (BIBO), KBe_2(BO_3)F_2(KBBF), K_2Al _2B_2O_7 (KABO), etc. The thermal expansion coefficients were measured to be α_x = α_y = 7.8 × 10~(-6) K~(-1), and α_z = 15.3 × 10~(-6) K~(-1), resulting in weaker expansion anisotropy than those of BBO, LBO, BIBO, CBO, CLBO, KBBF, La_2CaB_(10)O _(19) (LCB), etc.
机译:通过优化的顶晶溶液生长(TSSG)方法,已经生长出质量优良,重量为45 g,尺寸为38×30×20 mm〜3的新型非线性晶体Na_3La_9O_3(BO _3)_8(NLBO)。在晶体上进行了包括熔点,比热,热膨胀,热扩散和硬度在内的热物理性质,以确定沿不同晶体学轴的热行为。在20至300°C的温度范围内,比热为0.45-0.70 J·g〜(-1)·K〜(-1),低于β-BaB_2O_4(BBO)。 LiB_3O_5(LBO)和CsLiB _6O_(10)(CLBO)。 (100)面的维氏硬度经测量为1052.67 kg / mm〜2,(001)面的维氏硬度为1239.67 kg / mm〜2,大于大多数常用的硼酸盐晶体,例如BBO,LBO,CsB_3O_5(CBO ),BiB_3O_6(BIBO),KBe_2(BO_3)F_2(KBBF),K_2Al _2B_2O_7(KABO)等。测得的热膨胀系数为α_x=α_y= 7.8×10〜(-6)K〜(-1) ,而α_z= 15.3×10〜(-6)K〜(-1),导致膨胀各向异性小于BBO,LBO,BIBO,CBO,CLBO,KBBF,La_2CaB_(10)O _(19)(LCB )等

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