Pyroelectric properties of KTiOAsO sub(4) single crystals in the 4.2-300 K temperature range

The temperature dependence of the pyroelectric coefficient, gamma sub(s)(T), of KTA (KTiOAsO sub(4)) single crystals grown by the top-seeded solution method self-fluxes has been studied in the 4.2-300 K temperature range. A novel approach to the pyroelectric measurement has allowed to take into acco...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2010-03, Vol.405 (6), p.1586-1590
Main Authors: Shaldin, YuV, Matyjasik, S, Novikova, N E, Tseitlin, M, Mojaev, E, Roth, M
Format: Article
Language:English
Subjects:
Coefficients
Condensed matter
Crystals
Electrical resistivity
Impact tests
Single crystals
Temperature dependence
Trace impurities
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Summary:The temperature dependence of the pyroelectric coefficient, gamma sub(s)(T), of KTA (KTiOAsO sub(4)) single crystals grown by the top-seeded solution method self-fluxes has been studied in the 4.2-300 K temperature range. A novel approach to the pyroelectric measurement has allowed to take into account both the superionic conductivity of the crystal and the resistivity drop associated with thermal release of charge carriers from traps related to trace impurities. The gamma sub(s)(T) behavior in the 4.2-200 K temperature range is found to be similar to those of the isomorphic crystals belonging to the KTP (KTiOPO sub(4)) family of crystals. The experimental results show that at the temperature of 200 K the true value of the KTA pyroelectric coefficient equals -(3.5+/-0.3)x10 super(-5) C/m super(2) K. Two anomalies in the temperature dependence of the KTA pyroelectric coefficient have been revealed above 200 K, and they are discussed in terms of the superionic conductivity and structural changes associated with the temperature increase and isomorphic ion substitutions.
ISSN:0921-4526
DOI:10.1016/j.physb.2009.12.044