Influence of Cr Valence State on Dielectric-Temperature Stability of Barium Titanate Ceramics

Abstract:

For Barium Titanate Ceramics doped with the trivalent and hexavalent chromium oxides, the influence of Cr valence state on dielectric-temperature stability was investigated with Atomic force microscopy, X-ray diffraction, Raman spectroscopy, and dielectric measurements. The application of the trivalent Cr2O3 dopant can give rise to a temperature-stable X7R specification and a lower dielectric loss (< 0.02) when the sample was prepared at 1240 °C, but the dielectric permittivity is lower (~600); Cr ions exist predominantly as Cr4+ and slightly as Cr3+. Increasing sintering temperature will destroy the core-shell structure of the samples. The application of the hexavalent CrO3 dopant can not produce a temperature-stable X7R ceramic; Cr ions exist as Cr4+ and Cr5+. Cr5+ can not enter the perovskite lattice owing to the valence mismatching.

• Periodical: Advanced Materials Research (Volumes 560-561)
• Pages: 914-918
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.560-561.914
• Online since: August 2012
• Authors: Da Yong Lu, Li Zhang, Dan Dan Han, Yan Dong Wang, Xue Yang, Xiu Yun Sun
• Keywords: BaTiO₃, Chromium Coating, Dielectric Property, Valence Change

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