Reactions of barium carbonate with various oxides

2 Reactions of barium carbonate with various oxides 

The reactions of BaC03 with a number of oxides are accompanied by the evolution of C02. Attention has often been focussed on the identification of the several product phases, though some kinetic information is available. 

Si02 BaSi03 lBa2Si04 lBaCQ3 (BaSiQ3 + BaCQ3 + Ba2SiQ4 + C02) 

In a non-isothermal study of this reaction, Kato and Suyama [1216] found that the Si02 particle size markedly influenced the reactivity of this component, the formation of the intermediate (Ba2Si04), and the value of E. One value of E found here (226 kJ mole 1) was close to that reported earlier by Jander. 

Yamaguchi et al. [1217] identify the partially overlapping steps in the formation of Ba2Si04 as 

---