Characterization of BaTiO3 crystals formed in aluminosilicate glasses and their laser patterning

Abstract

BaTiO3 crystals synthesized through the crystallization of 40BaO40TiO215SiO25Al2O3 glass were characterized from Raman scattering spectrum, second harmonic generation (SHG), and polarization measurements. The structure of BaTiO3 nanocrystals (∼70 nm) formed initially was suggested to be pseudo-cubic (small tetragonality), and perovskite-type ferroelectric BaTiO3 crystals were formed in the heat-treatments at high temperatures of ∼930°C. The lines consisting of BaTiO3 crystals were patterned at the surface of CuO-doped glass by irradiations of continuous-wave Yb:YVO4 lasers with a wavelength of 1080 nm. It was confirmed that BaTiO3 being present in the laser-irradiated parts exhibits SHGs and, in particular, BaTiO3 formed in the laser ablation region has a tetragonal structure and a Curie temperature of ∼135°C. © 2013 The Ceramic Society of Japan.