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Author Kim, Young K. ♦ Jang, Hyun M.
Sponsorship (US)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Publisher The American Physical Society
Language English
Subject Keyword MATERIALS SCIENCE ♦ CATIONS ♦ CONTRACTION ♦ DIELECTRIC MATERIALS ♦ LATTICE PARAMETERS ♦ LINE BROADENING ♦ MODULATION ♦ ORDER PARAMETERS ♦ PHYSICS ♦ RAMAN SPECTRA ♦ SCATTERING ♦ THERMODYNAMICS ♦ X-RAY DIFFRACTION
Abstract It is known that microwave dielectric ZrTiO{sub 4} undergoes a normal-to-incommensurate phase transition (NICPT) near 1125{degree}C. The role of the cation ordering and its relation to the anomalous lattice contraction observed in the NICPT were studied by x-ray diffraction and Raman scattering of ZrTiO{sub 4} specimens prepared employing various cooling rates between 1250 and 1000{degree}C. It was shown that the lattice parameter b underwent a substantial change even if the long-range cation ordering was absent. Analysis of the Raman spectra indicated that the compositional fluctuation-induced line broadening was mainly responsible for the extrapolated linewidth at 0 K, suggesting that the observed lattice contraction was initiated by the local short-range cation ordering. Based on thermodynamic arguments, the anomalous lattice contraction of ZrTiO{sub 4} was attributed to a direct consequence of the gradient coupling between the two order parameters that describe a compositional modulation and a displacive modulation in the NICPT. {copyright} 2001 American Institute of Physics.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2001-06-01
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 89
Issue Number 11


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