Hydrothermal synthesis of KNbO3 and NaNbO3 powders

被引：159

作者：

Goh, GKL

Lange, FF

Haile, SM

Levi, CG

机构：

[1] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

[2] Univ Calif Santa Barbara, Mat Res Lab, Santa Barbara, CA 93106 USA

[3] CALTECH, Dept Mat Sci 138 78, Pasadena, CA 91125 USA

来源：

JOURNAL OF MATERIALS RESEARCH | 2003年 / 18卷 / 02期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1557/JMR.2003.0044

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Orthorhombic KNbO3 and NaNbO3 powders were hydrothermally synthesized in KOH and NaOH solutions (6.7-15 M) at 150 and 200 degreesC. An intermediate hexaniobate species formed first before eventually converting to the perovskite phase. For synthesis in KOH solutions, the stability of the intermediate hexaniobate ion increased with decreasing KOH concentrations and temperatures. This led to significant variations in the induction periods and accounted for the large disparity in the mass of recovered powder for different processing parameters. It is also believed that protons were incorporated in the lattice of the as-synthesized KNbO3 powders as water molecules and hydroxyl ions.

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页码：338 / 345

页数：8

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