Title :
Dielectric studies of Ba2PrxNd1−XFeNb4O15 ceramics
Author :
Banys, J. ; Bagdzevicius, S. ; Kinka, M. ; Samulionis, V. ; Grigalaitis, R. ; Castel, E. ; Josse, M. ; Maglione, M.
Author_Institution :
Vilnius Univ., Vilnius, Lithuania
Abstract :
We have investigated dielectric response of Ba2PrxNd1-xFeNb4O15 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 Ba2NdFeNb4O15 to the pure relaxor response of Ba2PrFeNb4O15 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.
Keywords :
barium compounds; cooling; dielectric hysteresis; ferroelectric ceramics; ferroelectric transitions; heating; iron compounds; neodymium compounds; praseodymium compounds; relaxor ferroelectrics; Ba2PrxNd1-XFeNb4O15; ceramics; cooling-heating hysteresis; dielectric properties; ferroelectric phase transition temperatures; frequency 20 Hz to 1 GHz; relaxor dielectrics; Cooling; Dielectrics; Heating; Hysteresis; Neodymium; Permittivity; Temperature dependence; Tetragonal tungsten bronze; dielectric properties; ferroelectric; relaxor;
Conference_Titel :
Applications of Ferroelectrics (ISAF/PFM), 2011 International Symposium on and 2011 International Symposium on Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials
Conference_Location :
Vancouver, BC
Print_ISBN :
978-1-4577-1162-6
Electronic_ISBN :
978-1-4577-1161-9
DOI :
10.1109/ISAF.2011.6013985
