Faculty of Physics, Vilnius University, Vilnius, Lithuania.
IEEE Trans Ultrason Ferroelectr Freq Control. 2012 Sep;59(9):1879-82. doi: 10.1109/TUFFC.2012.2400.
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.
我们研究了 Ba(2)Pr(x)Nd(1-x)FeNb(4)O(15) 陶瓷（x = 0、0.2、0.5、0.6、0.8、1）在 20 Hz 至 1 GHz 频率范围内的介电响应。所得结果证实了 Ba2NdFeNb4O15 的铁电行为与 Ba(2)PrFeNb(4)O(15) 的纯弛豫响应随 x 的增加而连续转变。对于中间的 x 值，观察到共存的铁电相变和弛豫介电特征，这对应于这些材料框架中的两种不同现象。增加 Pr 的量会降低这些陶瓷中的铁电相变温度；还观察到超过 50K 的大冷却-加热滞后。
