Preparation and characterization of a new perovskite-type oxide ion conductor KNb1-xMgxO3-delta

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	Preparation and characterization of a new perovskite-type oxide ion conductor KNb1-xMgxO3-delta
	J. Xiang; L. P. Li; W. H. Su
	2003
发表期刊	Acta Physica Sinica
ISSN	1000-3290
卷号	52 期号:6 页码:1474-1478
摘要	A series of solid electrolytes KNb1-xMgxO3-delta (x = 0.0-0.3) with an orthorhombic perovskite structure was synthesized under high temperature and high pressure (4.0GPa,870degreesC). The effect of Mg-doping on the structure transformation and electrical properties was systematically studied in this paper. The Raman spectra at different temperatures and differential thermal analysis results indicate that the structure of the samples transforms from ferroelectric orthorhombic to tetragonal phase, and finally to paraelectric cubic phase with increasing temperature. Weakening of the coupling effect of A-site cation on BO6 octahedra and the B-site cation contribution to spontaneous polarization, as a result of the Mg2+ doping in KNbO3, leads to the decrease of Curie temperature. The Curie point of KNb0.85Mg0.15O2.775, decreasing by about 40degreesC in comparison with KNbO3, is 392degreesC. Impedance spectroscopic data show that the conductivity of the samples is ionic, the grain-boundary effect is very significant, and the conductivity of the samples is determined mainly by the grain-boundary. Mg-doping increases the oxygen ion conductivity of the samples. KNb0.9Mg0.1O2.85 has the highest conductivity of 1.2 x 10(-3)S/cm at 700degreesC in all of the samples, which makes it a kind of promising oxygen ionic conduction materials.
部门归属	e china shipbldg inst, dept math phys, zhenjiang 212003, peoples r china. jilin univ, dept phys, changchun 130023, peoples r china. acad sinica, int ctr mat phys, shenyang 110015, peoples r china.;xiang, j (reprint author), e china shipbldg inst, dept math phys, zhenjiang 212003, peoples r china
关键词	Perovskite Ionic Conduction Kn1-xmgxo3-delta High-temperature And High-pressure Ferroelectric Phase-transition Hydrothermal Synthesis Phase-transitions (Ceo2)(1-x)(Bio1.5)(x) Electrolyte Ceramics Modes Knbo3
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WOS记录号	WOS:000183472500031
引用统计	被引频次：6[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/36088
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. Xiang,L. P. Li,W. H. Su. Preparation and characterization of a new perovskite-type oxide ion conductor KNb1-xMgxO3-delta[J]. Acta Physica Sinica,2003,52(6):1474-1478.
APA	J. Xiang,L. P. Li,&W. H. Su.(2003).Preparation and characterization of a new perovskite-type oxide ion conductor KNb1-xMgxO3-delta.Acta Physica Sinica,52(6),1474-1478.
MLA	J. Xiang,et al."Preparation and characterization of a new perovskite-type oxide ion conductor KNb1-xMgxO3-delta".Acta Physica Sinica 52.6(2003):1474-1478.