Phase transition in caesium dihydrogen phosphate crystal with thallium impurities

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A mixed crystal between two one-dimensional hydrogen bonding crystals of caesium dihydrogen phosphate (CDP) and thallium dihydrogen phosphate (TDP), CDP1-xTDPx, was studied by dielectric constant measurements of phase transition characteristics. Dielectric constant dependence on temperature in the CDP1-xTDPx crystal was best fitted by a power-law equation of the form epsilon' = C(T - T-o)(-gamma) with gamma = 1.43 for CDP, and gamma = 1.39 and gamma = 1.34 for CDP1-xTDPx mixed crystals of x = 0.003 and x = 0.008 respectively. A quasi-one-dimensional Ising model was employed to explain the experimental observations in terms of the decrease in the intrachain interaction constant, J(parallel to)/k(B), and the increase in the interchain interaction constant, J(perpendicular to)/k(B), with increasing TDP impurity concentration x.
Publisher
IOP PUBLISHING LTD
Issue Date
1999
Language
English
Article Type
Article
Keywords

FERROELECTRIC CSH2PO4; DIELECTRIC-PROPERTIES; SCATTERING; CSD2PO4; SPECTRA

Citation

JOURNAL OF PHYSICS-CONDENSED MATTER, v.11, no.1, pp.299 - 304

ISSN
0953-8984
DOI
10.1088/0953-8984/11/1/024
URI
http://hdl.handle.net/10203/69988
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