Effect of Grain Size on Phase Transitions and Dielectric Properties of Nano-Crystalline Barium Titanate Ceramics

Li Ming Wang; Xiang Yun Deng; Hai Tao Zhang; Jian Bao Li; Di Chen; Ri Ke Chen; Guo Qing Zhang; Kui Fan Su; Chun Peng Wang

doi:10.4028/www.scientific.net/AMR.602-604.192

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 602-604Effect of Grain Size on Phase Transitions and...

Effect of Grain Size on Phase Transitions and Dielectric Properties of Nano-Crystalline Barium Titanate Ceramics

Abstract:

Barium titanate (BaTiO3) ceramics with grain size varied from 1000 to 8 nm were prepared by two step sintering method (TSS) and spark plasma sintering (SPS), respectively. Mixture structures of BaTiO3 ceramics were proved by in-situ temperature high resolution x-ray diffraction. Multiple ferroelectric domains present in nano-crystalline BaTiO3 ceramics were observed by transmission electron microscope. The evolution of phase transitions supported the existence of intrinsic mechanism. Dielectric loss of fine grain size BaTiO3 was higher than coarse grain size during Curie phase transition due to diffuse phase transition and grain boundary effects.