Order-disorder nature of ferroelectric BaTi2O5 | Zendy

Anwar Hushur | Zendy; Hirotake Shigematsu | Zendy; Y. Akishige | Zendy; Seiji Kojima | Zendy

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Order-disorder nature of ferroelectric BaTi2O5

Author(s) -

Anwar Hushur,

Hirotake Shigematsu,

Y. Akishige,

Seiji Kojima

Publication year - 2005

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.1880442

Subject(s) - ferroelectricity , condensed matter physics , relaxation (psychology) , brillouin zone , materials science , raman scattering , raman spectroscopy , polarization (electrochemistry) , phase transition , antiferroelectricity , dielectric , chemistry , optics , physics , optoelectronics , psychology , social psychology

Ferroelectric single crystals of BaTi2O5 have been studied in detail by Raman and high-resolution micro-Brillouin scattering with a focus on the central component of the relaxation mode over a wide temperature range (20–600 °C). A relaxation mode has been clearly observed in these single crystals. The temperature dependences of the relaxation time and integrated intensity of the relaxation mode are well reproduced by the extended semiclassical tunneling model. The ferroelectric phase transition shows, at least near the vicinity of Tc, an order-disorder nature. Our results indicate that the spontaneous polarization mainly resulted from the dynamic disorder of the Ti ions in the octahedra along the polar b axis of BaTi2O5

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