Dielectric and Raman investigations on M2(SO4). Te(OH)6 (m =k, Rb and Cs)

Dielectric and Raman investigations in the temperature and frequency ranges 300-550K and 10 2 - 10 4 Hz respectively show that M 2 (SO 4 ). Te(OH) 6 with (M = K, Rb and Cs) materials present three phase transition. The first transition observed at 480, 440 and 460K respectively for M = K, Rb and Cs...

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Bibliographic Details
Published in:Ferroelectrics 1999-01, Vol.234 (1), p.47-59
Main Author: Khemakhem, Hamadi
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Exact sciences and technology
Ferroelectricity and antiferroelectricity
Lattice dynamics
Phase transitions and curie point
Phonon states and bands, normal modes, and phonon dispersion
Phonons and vibrations in crystal lattices
Physics
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Summary:Dielectric and Raman investigations in the temperature and frequency ranges 300-550K and 10 2 - 10 4 Hz respectively show that M 2 (SO 4 ). Te(OH) 6 with (M = K, Rb and Cs) materials present three phase transition. The first transition observed at 480, 440 and 460K respectively for M = K, Rb and Cs and should be probably of order-disorder type. The second one was observed only for Rb 2 (SO 4 ). Te(OH) 6 and Cs 2 (SO 4 ). Te(OH) 6 respectively at 510 and 495K. The third peak observed at 490, 520 and 510K for M = K, Rb and Cs respectively can be attributed to a ferroelectric-paraelectric phase transition.
ISSN:0015-0193
1563-5112
DOI:10.1080/00150199908225281