2D层状焦磷酸锰髤[NH_4]_2[Mn_3(P_2O_7)_2(H_2O)_2]的结构和磁性研究

作     者：石磊 于吉红 李乙 徐如人 高松 

作者机构：吉林大学无机合成与制备化学国家重点实验室化学学院长春130023 北京大学稀土材料化学与应用国家重点实验室化学与分子工程学院北京100870 

出 版 物：《无机化学学报》 (Chinese Journal of Inorganic Chemistry)

年 卷 期：2005年第21卷第2期

页      面：245-248页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：国家重点基础研究发展规划项目(No.G2000077507) 

主　　题：锰(Ⅱ) Mn^2+ 磁性 焦磷酸 层状 研究 

摘      要：A two-dimensional layered manganese(II) pyrophosphate, 2[Mn3(P2O7)2(H2O)2] (1), has been synthesized hydrothermally. Its structure is determined by single-crystal X-ray diffraction analysis. Its structure is built up by MnO6 octahedra and P2O7 units, with ammonium NH4+ cations residing in the interlayer regions. The manganese pyrophosphate layer consists of infinite chains of cis and trans edge sharing MnO6 octahedra linked by P2O7 units. Magnetic susceptibility measurements show that this compound exhibits ferrimagnetic-like ordering below 3.2 K. Further study shows that there are two possible superexchange pathways via the oxygen anions in Mn2+ ions. Owing to the different bridging modes of O2-, the competition between ferromagnetic interactions and antiferromagnetic interactions in Mn2+ ions results in the ferrimagnetic behavior of 1.