Title :
Coexistence of ferroelectric and relaxor states in Ba2PrxNd1-xFeNb4O15
Author :
Kinka, Martynas ; Josse, Michael ; Castel, Elias ; Bagdzevicius, Sarunas ; Samulionis, Vytautas ; Grigalaitis, Robertas ; Banys, Juras ; Maglione, Mario
Author_Institution :
Fac. of Phys., Vilnius Univ., Vilnius, Lithuania
fDate :
9/1/2012 12:00:00 AM
Abstract :
We have investigated the 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. The obtained results confirmed the continuous transformation from the ferroelectric behavior of Ba2NdFeNb4O15 to the pure relaxor response of Ba2PrFeNb4O15 with increasing x. For intermediate x values, coexisting ferroelectric transition and relaxor dielectric signatures were observed, corresponding to two different phenomena in the framework of these materials. Increasing the amount of Pr decreases the ferroelectric phase transition temperatures in these ceramics; a large cooling-heating hysteresis exceeding 50K was also observed.
Keywords :
barium compounds; cooling; dielectric hysteresis; ferroelectric ceramics; ferroelectric transitions; heat treatment; iron compounds; neodymium compounds; praseodymium compounds; relaxor ferroelectrics; Ba2PrxNd1-xFeNb4O15; ceramics; cooling-heating rate hysteresis; dielectric properties; ferroelectric phase transition temperatures; ferroelectric-relaxor state coexistence; frequency 20 Hz to 1 GHz; relaxor dielectric signatures; Ceramics; Dielectrics; Heating; Hysteresis; Permittivity; Solids; Tungsten;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
DOI :
10.1109/TUFFC.2012.2400
