High-Temperature Decomposition of B-Site-Ordered Perovskite Ba(Zn1/2W1/2)O3
Abstract:The reactions during high-temperature decomposition of Ba(Zn1/2W1/2)O3 double perovskite, a potential microwave dielectric material, were studied by using X-ray diffraction, electron microscopy, and Knudsen effusion combined with mass spectrometry. The results show that above 1200°C, the perovskite decomposes due to the sublimation of ZnO, which results in the formation of BaWO4, Ba2WO5, and amorphous BaO-rich phases. The simultaneous presence of BaWO4 and Ba2WO5 causes the formation of a liquid phase above 1320°C, which in the case of ceramics results in a progressive deterioration of the microstructure. As a consequence, the dielectric losses of Ba(Zn1/2W1/2)O3-based ceramics strongly depend on the processing parameters.
Document Type: Research Article
Affiliations: 1: Advanced Materials Department, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia 2: Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, USA
Publication date: March 1, 2010