Broadband dielectric spectroscopy of Ba(Zr,Ti)O.sub.3./sub.: dynamics of relaxors and diffuse ferroelectrics

0440805 - FZÚ 2015 RIV GB eng J - Článek v odborném periodiku
Petzelt, Jan - Nuzhnyy, Dmitry - Savinov, Maxim - Bovtun, Viktor - Kempa, Martin - Ostapchuk, Tetyana - Hlinka, Jiří - Canu, G. - Buscaglia, V.
Broadband dielectric spectroscopy of Ba(Zr,Ti)O₃: dynamics of relaxors and diffuse ferroelectrics.
Ferroelectrics. Roč. 469, č. 1 (2014), s. 14-25. ISSN 0015-0193. E-ISSN 1563-5112
Grant CEP: GA ČR GAP204/12/0232; GA ČR GA13-15110S
Institucionální podpora: RVO:68378271
Klíčová slova: relaxor * diffuse phase transition * dielectric dispersion * polar phonons * local ion hopping
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 0.469, rok: 2014

Broadband dielectric spectroscopy from Hz up to the infrared (IR) range and temperature interval 10-300 K was carried out for xBaZrO3-(1-x)BaTiO3 (BZT-x, x = 0.6, 0.7, 0.8) solid solution ceramics and compared with similar studies for x = 0, 0.2, 0.4, 1 ceramics. Fitting of the complete spectral range requires a relaxation in the 100 GHz range for all the samples. Below 1 GHz another relaxation appears, which is thermally activated and obeys the same Arrhenius bahavior for all the relaxor BZT samples. The relaxation is assigned to local hopping of the off-centered Ti4+ ions.
Trvalý link: http://hdl.handle.net/11104/0243918