A re-look at critical factors influencing single-phase formation of Ba2Ti9O20 microwave dielectrics

Bulletin of materials science

Seema Ansari¹  Dhanya Chandran¹  Rani Panicker¹  Bindu Krishnan¹  Unnikrishnan Gopinath¹  Raghu Natarajan¹ 

[1] Centre for Materials for Electronics Technology, Thrissur 680 771, India$$Centre for Materials for Electronics Technology, Thrissur 680 771, IndiaCentre for Materials for Electronics Technology, Thrissur 680 771, India$$

关键词: Microwave materials;    ceramic dielectric resonators;    polytitanates;    co-precipitation.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The present study focuses on critical factors limiting single-phase formation of Ba₂Ti₉O₂₀ (2 : 9). Apart from 2 : 9, other polytitanates that are richer in Ti or Ba could also be prepared as single-phase material without any stabilizing agent through chemical co-precipitation. 2 : 9 is found to be a stoichiometric compound and even 0.5% excess Ti or Ba leads to multiphase formation. Single-phase 2 : 9 could be achieved even through solid-state route without the addition of stabilizing agents using high purity raw materials. The present results do not agree with existing hypotheses viz. diffusion, high surface and nucleation energy, potential barrier, non-stoichiometry etc as critical factors limiting formation of 2 : 9 as single-phase material.

【 授权许可】

Unknown