双钙钛矿Pr_2NiMnO_6的X射线光电子能谱研究  

X-ray Photoelectron Spectroscopy of Double Perovskite Pr_2NiMnO_6

作　　者：郑光虎[1] 石磊[1] 刘海峰[1,2] 郭宇桥[1] 

机构地区：[1]中国科学技术大学合肥微尺度物质科学国家实验室,安徽合肥230026 [2]西南科技大学分析测试中心,四川绵阳621010

出　　处：《分析测试学报》2012年第10期1294-1297,共4页Journal of Instrumental Analysis

基　　金：国家科技部重大研究计划项目(2009CB939901);国家自然科学基金项目(10874161)

摘　　要：利用固相反应法合成了双钙钛矿Pr2NiMnO6。通过X射线衍射确定了样品物相的单一性。利用X射线光电子能谱和磁性测量系统分别对Ni、Mn的价态以及样品的低温磁性质进行分析。结果表明,在Pr2NiMnO6中,Ni、Mn主要以2价、4价的形式存在,低温下的铁磁行为来源于Ni2+-O-Mn4+铁磁超交换作用。该研究为探索同系双钙钛矿La2NiMnO6的磁性起源提供了重要参考。Double perovskite Pr2NiMnO6 was prepared by solid state reaction. Single phase of Pr2NiMnO6 was concluded by X-ray diffraction. The valence state of Ni/Mn and the ferromagnetic behavior were analyzed by X-ray photoelectron spectroscopy （XPS） and magnetism measurement system, respectively. The results indicated that Ni/Mn are mainly divalent/tetravalent and the strong ferromagnetism of PrENiMnO6 obtained by magnetic measurements at low temperature is attributed to pre- dominant Ni2＋ - O - Mn4＋ rather than Ni3＋ - O - Mn3＋ ferromagnetic superexchange interaction. This study provides an important clue for the exploration of the magnetism origin of La2 NiMnO6.

关 键 词：双钙钛矿 X射线光电子能谱 价态 铁磁性 超交换作用 

分 类 号：O657.3[理学—分析化学] P578.491[理学—化学]