Microstructure and ferroelectric properties of MnO 2 -doped bismuth-layer (Ca,Sr) Bi 4Ti 4O 15 ceramics

Gurong Li, Liaoying Zheng, Qingrui Yin, Bei Jiang, Wenwu Cao

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We have studied the microstructures and ferroelectric properties of Mn O2 -doped bismuth-layered (Ca,Sr) Bi4 Ti4 O15 (CSBTM). The piezoelectric coefficient, dielectric loss, mechanical quality factor, and the P-E hysteresis loop measurements indicate that Mn ions entered both the A and B sites of the pseudoperovskite-layered structure, creating "soft" and "hard" doping effects simultaneously. Scanning electron microscopy and energy dispersion spectroscopy showed that the platelike grains in CSBTM ceramics become larger with the increase of Mn O2 additive, and Mn ions are found inside the grains as well as in the grain boundaries. The lattice parameter, room-temperature dielectric constant, and the Curie temperature do not vary with Mn O2 additive. We conclude that the Mn3+ ions play a critical role in the effects of soft and hard behaviors since it can enter both the A and B sites of the perovskite structure.

Original languageEnglish (US)
Article number064108
JournalJournal of Applied Physics
Issue number6
StatePublished - Sep 15 2005

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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