Synthesis and Sintering of Nanocrystalline Barium Titanate Powder under Non-Isothermal Conditions. Part 6. Structure, Grain Boundaries, and Dielectric Properties of Barium Titanate Obtained by Various Sintering Methods

The grain boundary structure of barium titanate obtained by controlled-rate sintering and high-pressure sintering (HPS), and the dependence of dielectric properties on grain size and consolidation method were studied. It was shown that sintering without the application of pressure leads to a diffusi...

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Bibliographic Details
Published in:Powder metallurgy and metal ceramics 2001-01, Vol.40 (1-2), p.25-33
Main Authors: Ragulya, Andrey V, Skorokhod, Valerii V
Format: Article
Language:English
Subjects:
Barium
Barium titanates
Ceramics
Dielectric constant
Dielectric properties
Grain boundaries
Grain size
Mathematical models
Sintering (powder metallurgy)
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Summary:The grain boundary structure of barium titanate obtained by controlled-rate sintering and high-pressure sintering (HPS), and the dependence of dielectric properties on grain size and consolidation method were studied. It was shown that sintering without the application of pressure leads to a diffusion-controlled formation of equilibrium grain boundaries with minimal impedance factor, which minimally decrease the dielectric constant of the ceramics. HPS results in the formation of non-equilibrium grain boundaries which have a large free volume, and which substantially decrease the dielectric constant. The Curie-Weiss constant was analyzed from the viewpoint of a matrix structural model, and a «brick-wall» model.[PUBLICATION ABSTRACT]
ISSN:1068-1302
1573-9066
DOI:10.1023/A:1011347519938