Rai Radheshyam, Duarte Pedro, Bdikin Igor, Valente Manuel Almeida, Marques Paula Alexandrina, Gracio Jose, Kholkin Andrei L
CICECO and Department of Ceramics and Glass Engineering, University of Aveiro, Aveiro, Portugal.
J Nanosci Nanotechnol. 2012 Aug;12(8):6639-44. doi: 10.1166/jnn.2012.4559.
Bi(1-x-y)GdxBayFe(1-y)TiyO3 (x = 0.1 and y = 0.1, 0.2, 0.3) solid solutions have been prepared via solid state reaction method with the aim to obtaining magnetoelectric coupling (i.e., linear relation between magnetization and electric field) at room temperature. Optimum calcination and sintering strategies for obtaining pure perovskite phase, high density ceramics and homogeneous microstructures have been determined. The maximum ferroelectric transition temperature (Tc) of this system was 150-170 degrees C with the dielectric constant peak of 2300 at 100 kHz for y = 0.1. Well saturated piezoelectric loops were observed for all composition indicating room temperature ferroelectricity. Hardness and Young's modulus decrease with depth and with increasing concentration y.
通过固态反应法制备了Bi(1-x-y)GdxBayFe(1-y)TiyO3（x = 0.1且y = 0.1、0.2、0.3）固溶体，目的是在室温下实现磁电耦合（即磁化强度与电场之间的线性关系）。已确定了获得纯钙钛矿相、高密度陶瓷和均匀微观结构的最佳煅烧和烧结策略。对于y = 0.1的情况，该体系的最大铁电转变温度（Tc）为150 - 170摄氏度，在100 kHz时介电常数峰值为2300。观察到所有成分都有良好饱和的压电回线，表明存在室温铁电性。硬度和杨氏模量随深度以及y浓度的增加而降低。
