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Bi2 O3、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～2 h)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10 min时,即有钙钛矿结构BiMnO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BiMnO样品软磁性能最好,其比饱和磁化强度为33 emu/g,矫顽力为37.6Oe(测试温度90 K).
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