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Title固相反应YCrO3化合物的晶体结构和磁性研究
CreatorZhao, Q.; Li, H.-F.
Subtype学士Bachelor
Thesis AdvisorChao Yang, Hai-Feng Li
Date Issued2020-06-28
Degree Grantor华南理工大学
Place of Conferral华南理工大学
KeywordYcro3 磁性 晶体结构 X射线衍射
Abstract

我们通过固相反应法制备了YCrO3化合物,利用X射线衍射和PPMS DynaCool 物性综合表征系统对YCrO3化合物进行了晶体结构和磁性的表征。YCrO3的反铁磁转变温度约为141.5 K,低温磁化强度曲线符合铁磁体的特征,而高温区域的曲线表现出明显的反铁磁居里-韦斯行为,所以,YCrO3化合物的磁性结构属于倾斜反铁磁性。对于磁滞回线的测量也印证了以上结论,并显示YCrO3在低温下是软铁磁体。YCrO3比热容随温度变化的曲线在140 K附近出现尖锐的λ形状峰,比热容的磁场依赖关系表明在TN处发生的相变是磁性相变而不是结构相变。对X射线衍射数据进行了结构精修,显示YCrO3样品属于正交晶系,Pbnm空间群。精修得到的X射线衍射图显示出良好的单相性,并且没有出现结构相变,精修得到的晶体结构参数列于文中。对晶格参数的分析显示,YCrO3化合物存在各向异性的磁致伸缩效应,而在TN以下出现负的热膨胀现象。相比于Cr离子的局部畸变参数Δ在36到300 K范围内始终保持低水平,Y、O1和O2离子显示出大的Δ值,表明较大的晶格畸变。对于键价态,Cr离子计算的BVS值接近于理想的3+,而Y和O1/O2离子存在一定的正负电荷迁移。

Language中文Chinese
PUB ID50613
Document TypeThesis
CollectionINSTITUTE OF APPLIED PHYSICS AND MATERIALS ENGINEERING
Corresponding AuthorLi, H.-F.
Recommended Citation
GB/T 7714
Zhao, Q.,Li, H.-F.. 固相反应YCrO3化合物的晶体结构和磁性研究[D]. 华南理工大学. 华南理工大学,2020.
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