摘要
具有严重晶格畸变的钙钛矿结构BiMnO3作为可表现出铁磁性和铁电性的多铁材料,在信息存储和传感器等方面具有潜在的应用价值,得到了广泛的关注和研究。利用国产六面顶液压机,以Bi2O3、MnO2和Mn粉末为原料,在高温高压条件下(4 GPa,750~800℃)制备了单斜钙钛矿结构BiMnO3烧结体。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、振动样品磁强计(VSM)对烧结样品进行测试分析,考察了不同含量比(n(MnO2)/n(Mn)=3.5∶0.5、3∶1、2.5∶1.5、2∶2)、烧结时间(10min^2h)对样品结构、组织形貌及磁性的影响。实验结果表明:当n(MnO2)/n(Mn)=3∶1时合成钙钛矿结构BiMnO3的纯度最高;当烧结时间为10min时,即有钙钛矿结构BiMnO3生成,随着烧结时间的延长,BiMnO3的相对含量逐渐增大。800℃、1h合成的钙钛矿结构BiMnO3样品软磁性能最好,其比饱和磁化强度为33emu/g,矫顽力为37.6Oe(测试温度90K)。
The perovskite BiMnO3 with serious lattice distortion is multiferroic materials with ferromagnetism and ferroelectricity, thus having potential application value in such aspects as information storage and sensor, and re- ceiving wide attention and researches. The BiMnO3 sintered body with perovskite structure was prepared, using Bi2O3, MnO2 and Mn powders as starting materials, under high temperature and high pressure （HPHT, 4 GPa, 750-800 ℃） conditions in a China CS-IV type cubic-anvil high pressure apparatus （CHPA）. The sintered samples were tested and analyzed by using X-ray diffraction （XRD）, scanning electron microscopy （SEM） and vibrating sample magnetometer （VSM）, and the effects of the different content ratios （n（MnO2）/n（Mn） = 3.5 ： 0. 5, 3 ： 1, 2.5 ： 1.5 and 2 ： 2） and sintering periods （10 min-2 h） on the sample structure, morphology and magnetic properties were studied. The experimental results showed that when n（MnO2 ）/n（Mn） = 2 ： 3 ： 1, the relative content of BiMnO3 was maximum. When the sintering time was 10 min, perovskite BiMnO3 was generated, and the relative content of BiMnO3 increased gradually with the extension of sintering time. The perovskite structure BiMnO3 synthesized at 800 ℃ for 1 h showed the best soft magnetic performance,with the saturation magnetization and coercive force of 33 emu/ g and 37.60e respectively （measured at 90 K）.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2015年第10期34-38,共5页
Materials Reports
基金
国家自然科学基金(20971055
51301075)
吉林省科技发展计划项目(20130522144JH)
关键词
高温高压
BiMnO3
结构
磁性
high temperature and high pressure, BiMnOa, structure, magnetic property
