Phase coexistence of hyderogen-bonded mixed crystals

The complex dielectric constants and polarization of the hydrogen-bonded mixed crystals, K 1−x (NH 4 ) x H 2 PO 4 and Rb 1−x (NH 4 ) x H 2 AsO 4 , near the ferroelectric-proton glass phase boundary have been investigated as a function of temperature. Coexistence of both phases was discovered from a...

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Bibliographic Details
Published in:Ferroelectrics 2001-01, Vol.259 (1), p.187-196
Main Authors: Kwun, Sook-Il, Noh, Keum Hwan, Yoon, Jong-Gul
Format: Article
Language:English
Subjects:
coexistence
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Dielectric properties of solids and liquids
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Exact sciences and technology
ferroelectric
mixed crystals
Permittivity (dielectric function)
Physics
Polarization and depolarization
proton glass
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Summary:The complex dielectric constants and polarization of the hydrogen-bonded mixed crystals, K 1−x (NH 4 ) x H 2 PO 4 and Rb 1−x (NH 4 ) x H 2 AsO 4 , near the ferroelectric-proton glass phase boundary have been investigated as a function of temperature. Coexistence of both phases was discovered from a glassy dispersion at low temperature and a ferroelectric anomaly. The dielectric dispersion due to the coexisting proton glass state occurred at lower temperatures than for pure proton glass composition. The detection of polarization after field-cooling or zero field-cooling the sample showed that the ferroelectric domain and polarization were retained in the glass freezing process. These results are qualitatively consistent with the expectation of the infinite ranged random-bond random-field model in the presence of macroscopic polarization.
ISSN:0015-0193
1563-5112
DOI:10.1080/00150190108008738