多铁性复合陶瓷的制备及电磁性能研究

The Preparation and Electric-magnetic Properties of the Multiferroic Composite Ceramics

采用传统的固相反应法制备了钛酸钡与铁氧体的多铁性复合陶瓷。XRD和SEM测试表明,复合陶瓷由四方相的BaTiO_3陶瓷和Co-Ti掺杂的铁氧体混合物组成。磁性和铁电性能测试表明,复合陶瓷同时表现为室温下的铁磁性和铁电性共存。复合物的饱和磁化强度随着铁氧体含量的增加而增加;而饱和极化强度,剩余极化强度和矫顽场随铁氧体含量的增加而减少。复合陶瓷的介电常数在更高的频率时随铁氧体含量的增加而减小,而介电损耗随着铁氧体含量的增加而增加。

Thebarium titanate/ferrite multiferroiccomposite ceramics were fabricated by conventional solid state reaction method. X--ray diffractionandscanning electron microscope show the compositeceramics are composed of thetetragonal perovskite BaTiO3 phase and the M--type/Y--type hexaferritesmixture phases. The magneticand electrical properties analysis results show that thecomposite ceramics display ferromagnetic and ferroelectricproperties simultaneouslyat room tempera ture. The saturated magnetization values of the composite ceramicsincrease with the riseof ferrite content. In addition, the saturated polarization values, the remnant polarization values as well as theelectric coercivityvalues of the composites decrease with increasing ferrite content. At high frequency, the dielectric constant gradually decreases withincreasing ferrite content, while the dielectric loss is contrary.