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  5. Preparation and dielectric properties Barium strontium titanate niobate composite ceramics by powder

Preparation and dielectric properties Barium strontium titanate niobate composite ceramics by powder

来源 :2012 Postdoctoral Symposium of China on Materials Science & | 被引量 : 0次 | 上传用户：yanqingqing1213
【摘 要】
：
Barium strontium titanate niobate (BST/SBN) composite ceramics system following the general formula 0.7BaO·0.3SrO·(1-y)TiO2·yNb2O5 were firstly prepared by the modified Powder-Sol method.By controllin
【出 处】
：
2012 Postdoctoral Symposium of China on Materials Science &
【发表日期】
：
2012年8期
【关键词】
：
Powder-sol dielectric properties perovskite phase tungsten bronze phase 
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　　Barium strontium titanate niobate (BST/SBN) composite ceramics system following the general formula 0.7BaO·0.3SrO·(1-y)TiO2·yNb2O5 were firstly prepared by the modified Powder-Sol method.By controlling the viscosity of the sol solution, Nb2O5 powders was uniformly suspended in the BST Sol.Powders obtained from dried gels were calcined at 800℃ for 3h.The samples were prepared at a pressure of 300MPa from dried powders.The bulk samples were sintered at 1200℃for 3 h.The results of the XRD indicate that the perovskite phase and the tungsten bronze phase coexisted stably in BST/SBN.The relative dielectric constants (εr) and dielectric loss (tang) of 0.3SrO·0.7BaO·yNb2O5·(1-y)TiO2 are improved when the values of y is 0.4~0.6.
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