Thermal Expansion of Nonlinear Optical Crystal La2CaB10O19

概要

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The thermal expansion coefficients of the nonlinear optical crystal La2CaB10O19 (LCB) were measured along three crystallographic axes ($a$, $b$, $c$) and in another direction marked with d, which lay in the (010) plane with the angle between a and d equal to 45°. Thermal expansion measurements were carried out in the temperature range between 25°C and 300°C. The experimental data obtained were $8.642\times 10^{-6}$, $8.387\times 10^{-6}$, $2.266\times 10^{-6}$ and $5.813\times 10^{-6}$ K-1, respectively. The changes of lattice constants for $a$, $b$, and $c$ were calculated. The three principle expansion coefficients were calculated to be $8.665\times 10^{-6}$ K-1, $8.387\times 10^{-6}$ K-1 and $2.261\times 10^{-6}$ K-1, respectively. The anisotropy of the structure of the La2CaB10O19 crystal leads to the anisotropic thermal expansion property.
2005-04-15