Synthesis and Thermal Expansion Properties of Ba, Sr-substituted Cubic Cs-leucite Compounds

Abstract

Ba, Sr-substituted cubic Cs-leucite compounds were synthesized by a multi-step heating process. Thermal expansion rates at 1173K for the synthesized cubic Cs-leucite compounds decreased with increasing the substituted amount of Ba²⁺ or Sr²⁺ ions. The synthesized Cs_0.675Sr_0.1125Al_0.9Si_2.10₆ showed thermal expansion rate about 0.11% at 1173K, which was much smaller than CsAlSi₂0₆. The thermal expansion rates decreased with increasing space ratio in the unit cell at 298K.