Dielectric permittivity of kaolinite heated to high temperatures

Heating of kaolinite from the room temperature to 600 °C results in a gradual decrease in the dielectric permittivity. However, when the temperature rises to 1000 °C the high frequency permittivity of kaolinite increases surprisingly. We suppose that the decomposition of the material produces imperf...

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Bibliographic Details
Published in:The Journal of physics and chemistry of solids 2010-05, Vol.71 (5), p.827-831
Main Authors: Leluk, Karol, Orzechowski, Kazimierz, Jerie, Kazimierz, Baranowski, Andrzej, SŁonka, Tadeusz, GŁowiński, Józef
Format: Article
Language:English
Subjects:
C. Positron annihilation spectroscopy
Calcination
D. Dielectric properties
Dielectric constant
Dielectrics
Heating
High frequencies
Kaolinite
Permittivity
Positron annihilation
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Summary:Heating of kaolinite from the room temperature to 600 °C results in a gradual decrease in the dielectric permittivity. However, when the temperature rises to 1000 °C the high frequency permittivity of kaolinite increases surprisingly. We suppose that the decomposition of the material produces imperfections, which liberate a small distance movement of polar groups. Positron annihilation experiments performed in this material confirm the appearance of empty volumes after kaolinite calcination.
ISSN:0022-3697
1879-2553
DOI:10.1016/j.jpcs.2010.02.008