High dielectric-permittivity properties of NaCu3Ti3Sb0.5Nb0.5O12 ceramics. Issue 1 (January 2016)

• Record Type: Journal Article
• Authors: Shi, Yongjie; Hao, Wentao; Wu, Hui; Sun, Li; Cao, Ensi; Zhang, Yongjia; Peng, Hua
• Is Part Of: Ceramics international. Volume 42:Issue 1:Part A(2016)
• Page Start: 116
• Page End: 121
• Publication Date: 2016-01
• Subjects: NaCu3Ti3Sb0.5Nb0.5O12 ceramics -- High dielectric-permittivity properties -- Internal barrier layer capacitance effect -- CaCu3Ti4O12 ceramics; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.08.009
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A series of NaCu3 Ti3 Sb0.5 Nb0.5 O12 ceramics were prepared by the conventional solid-state reaction technique under different sintering temperatures. Their crystalline structures, microstructures, dielectric properties and complex impedance were investigated systematically. All the ceramics show the main phases of perovskite-related crystallographic structure, and their dielectric properties change significantly with sintering temperature. Those ceramics sintered above 1293 K perform high dielectric-permittivity properties with ε′ over 5000. Impedance spectroscopy analysis reveals that NaCu3 Ti3 Sb0.5 Nb0.5 O12 ceramics are electrically heterogeneous and composed of semiconducting grains and insulating grain boundaries. Moreover, a small amount of CuO secondary phase and Cu 2+ /Cu 1+, Ti 4+ /Ti 3+, Sb 5+ /Sb 3+ and Nb 5+ /Nb 4+ aliovalences is found to exist in NaCu3 Ti3 Sb0.5 Nb0.5 O12 ceramics through XRD and XPS analysis. Internal barrier layer capacitance effect is suggested to be the origin of the high dielectric-permittivity properties in NaCu3 Ti3 Sb0.5 Nb0.5 O12 ceramics.