系统研究了稀土ErCrO_3铬氧化物的结构与磁特性,结果表明,室温下实验样品ErCrO_3呈正交的单相结构(Pbnm群);从热磁曲线M-T结合不同温度下的磁滞回线结果发现,在T＞133K的高温区体系表现出典型的顺磁特性,其直流磁化率倒数随温度的变化很好地遵从居里-外斯定律,由此拟合可给出体系的有效平均磁矩μ_(eff)=10.57μB、顺磁居里温度T_(cw)=-30K.随温度降低,在133K以下样品呈现出弱铁磁的Г_4(F_x)相,即铁磁相变温度为T_N≈133K;当温度进一步降低到约20K,样品ErCrO_3经历了从Г_4(F_x)弱铁磁到反铁磁相G_y或Г_1(0)的转变,并呈现出自旋重新取向特征;结合ErCrO_3结构特征,这一温度依赖的复杂磁特性反映了Cr~(3+)-Cr~(3+)、Cr~(3+)-Er~(3+)和Er~(3+)-Er~(3+)离子之间的交换耦合作用.
The rare earth ErCrO_3 chromites have been systemically studied by structural and magnetic measurement.The results indicate that the samples show the perovskite-type ErCrO_3 orthorhombic structure with space group Pbnm.The magnetic properties shown that ErCrO_3 possess significant weak ferromagnetism below 133K.At T_(SR)≈20K,ErCrO_3 undergoes a spin reorientation from Г_4(A_x,F_x,C_z) to Г_1(A_x,G_y,C_z) or Г_1(0) where the weak ferromagnetic moment disappears.And in the region of higher temperature T＞133K,the reciprocal of magnetic susceptibility χ~(-1) of ErCrO_3 chromites behaves linearly indicating a typical curie-weiss behavior fitted.The effective magnetic moment μ_(eff)=10.57μB and asymptotic paramagnetic curie temperature T_(cw)=-30K,which suggests the predominance of antiferromagnetic interactions in ErCrO_3 chromites.The current magnetization can be interpreted from the interaction between Cr~(3+)-Cr~(3+),Cr~(3+)-Er~(3+),Er~(3+)-Er~(3+).
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