Preparation and electrical properties of SrTiO3 ceramics doped with M2O3–PbO–CuO期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Preparation and electrical properties of SrTiO₃ ceramics doped with M₂O₃–PbO–CuO

Authors:	Jingchang Zhao Xinghui Wu Longtu Li Xian Li

Affiliation:	^a Department of Materials Science and Engineering, Yunnan University, Kunming 650091, PR China ^b Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China

Abstract:	SrTiO₃ dielectric ceramics were fabricated in air by using M₂O₃–CuO–PbO as dopants (M=Sm,Nd,La,Yb). The obtained ceramics exhibited a high dielectric constant (₂₅>4880) with stable temperature characteristics. With doping the rare-earth ions from Sm → Nd → La → Yb, the corresponding dielectric constant regularly decreased. The investigation of microstructure showed that Yb additives benefited to the grain growth and CuO additives mainly segregated at the grain boundaries to form the insulation layers. According to the results, the conduction mechanism of SrTiO₃–M₂O₃–CuO–PbO system was discussed.

Keywords:	SrTiO₃-based ceramics Capacitors Dielectric properties
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