1. Dielectric studies of Ba2PrxNd1−XFeNb4O15 ceramics
- Author
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Vytautas Samulionis, Robertas Grigalaitis, Martynas Kinka, Mario Maglione, Michaël Josse, Š. Bagdzevičius, J. Banys, and Elias Castel
- Subjects
Permittivity ,Phase transition ,Materials science ,Condensed matter physics ,Ferroelectric ceramics ,Analytical chemistry ,chemistry.chemical_element ,Dielectric ,Ferroelectricity ,Neodymium ,Hysteresis ,chemistry ,visual_art ,visual_art.visual_art_medium ,Ceramic - Abstract
We have investigated dielectric response of Ba 2 Pr x Nd 1−x FeNb 4 O 15 ceramics (x = 0, 0.2, 0.5, 0.6, 0.8, 1) in the frequency range from 20 Hz to 1 GHz. Obtained results showed a continuous transformation from the ferroelectric behavior of Ba 2 NdFeNb 4 O 15 to the pure relaxor response of Ba 2 PrFeNb 4 O 15 with increasing x. For intermediate x values coexistences of both ferroelectric transition and relaxor dielectric signatures corresponding to two different phenomena in the framework of these materials were observed. The increase of Pr amount lowers ferroelectric phase transition temperatures in these compounds and also a huge cooling-heating hysteresis exceeding 50 K was observed, which origin is under discussion yet.
- Published
- 2011
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