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Study on Microstructure and Properties of Nanograin ferroelectric ceramics
Keywords: nanograin, ferroelectric, microstructure
A series of nanocrystalline barium titanate ferroelectric ceramics with an average grain size below 100nm have been fabricated and studied.The microstructure, properties, phase transition and size effect of BaTiO3 ceramics have been investigated systematically by using TEM, HRTEM, XRD and Raman Spectra. Scanning nonlinear dielectric microscopy tested confirmed that the existence of nano ferroelectric domains in a broad temperature range. The Raman Spectra revealed successive transitions from rhombohedral to orthorhombic, tetragonal and cubic with the temperature increased from 87 to 673k. Dielectric measurements results are also show that ferroelectricity could still retained in BaTiO3 ceramics with grain size of 8 nm.
Longtu Li, Professor
Tsinghua University
Beijing 100084,
China


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