Study on the growth, modification and thermal properties of γ-LiAlO2 single crystals

Abstract

Transparent and crack-free γ-LiAlO2 single crystal was grown by quic k Czochra lski technique. However, high melting point and easy volatilization degraded the quality of the crystal. The fall with at half maximum(FWHM) value dropped from 1169arcsec to 442arcsec when the crystal was modified by vapor transport equ ilibrium(VTE) technique. But when the temperature of VTE was 1300℃, the FWHM va lue increased to 552arcsec. The ［100］-orientation thermal expansion coeffici ent of the as-grown crystal was 176798×10-6/K, while that alon g the ［0 01］-orientation was 107664×10-6/K. After three VTE treatments , the cor responding thermal expansion coefficients decreased to 166539×10-6/K and 101784×10-6/K, respectively.