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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.119  No.1385 (January) (2011)  >  pp.1-7

Journal of the Ceramic Society of Japan
<<Previous article Vol.119  No.1385 (January) (2011)   pp.1 - 7 Next article>>

Microstructural evolution by in-situ TEM observations of oxides

Hiromi NAKANO1)
1) Cooperative Research Facility Center, Toyohashi University of Technology

  In-situ observations using high-temperature transmission electron microscopy (TEM) is a promising technique for obtaining new findings and developing phenomenological theory for ceramic materials at high temperatures. By observing the changes in hydrothermal BaTiO3 due to heating, we clarify the vanishing mechanism of internal pores and the mechanism of BaCO3 phase generation/vanishing at high temperatures. Through observations of the grain growth of BaTiO3 prepared by radio-frequency plasma chemical vapor deposition, we calculate the grain-boundary diffusion coefficient, which is an important parameter controlling the sinterability of ceramics. Observations of the shrinkage and disappearance of Ba5Nb4O15, as well as simulations, indicate that high energy and low diffusivity at the grain boundary make grains vanish while maintaining a truncated spherical shape. Finally, observations of the structural changes in layered perovskite BaLn2Mn2O7 (Ln = Gd, Pr, Eu) reveal a first-order phase transition that has not been previously reported.

TEM, In-situ observation, Grain growth, Phase transition, Microstructure

Received: July 26, 2010
Accepted: October 08, 2010 , Published online: January 01, 2011
Copyright (c) 2011 The Ceramic Society of Japan



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