Structural Transitions in Boracites: One or Two Order-Parameters? | Zendy

P. Tolédano | Zendy; Heinz Schmid | Zendy; M. Clin | Zendy; J.P. Rivera | Zendy

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Structural Transitions in Boracites: One or Two Order-Parameters?

Author(s) -

P. Tolédano,

Heinz Schmid,

M. Clin,

J.P. Rivera

Publication year - 1985

Publication title -

japanese journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.487

H-Index - 129

eISSN - 1347-4065

pISSN - 0021-4922

DOI - 10.7567/jjaps.24s2.347

Subject(s) - dielectric , permittivity , ferroelectricity , quadratic equation , condensed matter physics , polarization (electrochemistry) , interpretation (philosophy) , dielectric response , phenomenological model , order (exchange) , dielectric permittivity , materials science , statistical physics , physics , optics , mathematics , chemistry , quantum mechanics , geometry , computer science , finance , economics , programming language

In light of the structural and dielec. data available for 23 boracites, a phenomenol. approach of the sequences of ferroelec.-ferroelastic phases obsd. in this family of compds. is proposed. It makes use of a single 6-dimensional order-parameter, in agreement with the theory of V. Dvorak and J. Petzelt (1971) and Yu. M. Gufan and V. P. Sakhnenko (1973) and in contrast to the 2-order-parameter model claimed by A. P. Levanyuk and D. G. Sannikov (1974, 5). A new interpretation is suggested for the temp. dependences of the polarization and dielec. permittivity, which involves 2 coupling terms, linear in the polarization components, and resp. quadratic and cubic in the order-parameter components

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