Author： Cao Wan Qiang Chen Wei Shang Yu Li Shu Ming Fei
Publisher： Taylor & Francis Ltd
ISSN： 0731-5171
Source： Ferroelectrics Letters Section, Vol.39, Iss.4-6, 2012-01, pp. : 71-75
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Abstract
The concept `relaxativity' is proposed to describe the degree of dielectric relaxor in relaxor ferroelectrics, like the `fragility' in supercooled liquid in describing glass forming ability during vitrification process. The calculated results of Pb(Mg1/3Nb2/3)O3-PbTiO3 relaxors and BaTiO3-BaZrO3 relaxors exhibit good coincidences with the intervals between their dielectric peak temperatures. The larger relaxativity is corresponding to larger configurational entropy and smaller spatial correlation length, or stronger local interactions for a relaxor.
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