Synthesis and Sintering of Barium Tin Borate

Abstract

Synthesis of BaSn(B0₃)₂ by solid-state reactions among BaCO₃, B₂0₃ and SnO₂ during 500-1150°C and sintering of the synthetic powders over 1000-1150°C have been st udied. The reaction seems to proceed as follows: (1) formation of BaB₂0₄ by a reaction between BaCO₃ and B₂0₃ between 500 and 800°C, (2) formation of BaSn(B0₃)₂ by a reaction between SnO₂ and BaB₂0₄ between 800 and 1900°C and (3) increase of SnO₂ content due to a decomposition of BaSn(B0₃)₂ beyond 1000°C. Dense specimens were obtained by calcination at 950°C and sintering between 1100 and 1150°C. The maximum electric resistivity of sintered BaSn(B0₃)₂ was 7.3×10¹⁴Ω.⋅cm for the present experimental conditions.