title: Coexistence of ferroelectric and relaxor states in Ba2PrxNd1-xFeNb4O15.
abstract: We have investigated the 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. The obtained results confirmed the continuous transformation from the ferroelectric behavior of Ba2NdFeNb4O15 to the pure relaxor response of Ba(2)PrFeNb(4)O(15) 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.
authors.affiliation: Faculty of Physics, Vilnius University, Vilnius, Lithuania. martynas.kinka@delfi.lt
authors.forename: Martynas
authors.initials: M
authors.lastname: Kinka
authors.forename: Michael
authors.initials: M
authors.lastname: Josse
authors.forename: Elias
authors.initials: E
authors.lastname: Castel
authors.forename: Sarunas
authors.initials: S
authors.lastname: Bagdzevicius
authors.forename: Vytautas
authors.initials: V
authors.lastname: Samulionis
authors.forename: Robertas
authors.initials: R
authors.lastname: Grigalaitis
authors.forename: Juras
authors.initials: J
authors.lastname: Banys
authors.forename: Mario
authors.initials: M
authors.lastname: Maglione