Production of ferroelectric material by crystallization of low melting glass with bismuth oxide

Abstract

Crystallization of low melting glasses containing bismuth oxide was studied by means of XRD, SEM, and EPMA. Glass compositions used in this study were 40Bi₂O₃-(40-x)B₂O₃-(20+x)TiO₂ (mol%) system. These glasses were crystallized at the crystallization temperature of each glass. The crystals were identified using XRD. These crystals were Bi₂Ti₂O₇, Bi₆B₁₀O₂₄ and Bi₄Ti₃O₁₂. The crystal which crystallized 40Bi₂O₃-40B₂O₃-20TiO₂ glass was almost Bi₆B₁₀O₂₄. On the other hand, the crystal of 40Bi₂O₃-25B₂O₃-35TiO₂ glass was Bi₄Ti₃O₁₂ and Bi₂Ti₂O₇. 40Bi₂O₃-25B₂O₃-35TiO₂ glass was heat-treated at each temperature. As a result, it is found that the crystal becomes only Bi₄Ti₃O₁₂ crystal at 700C.