层状结构硫代亚磷酸镍锰(Ni_xMn_(1-x)PS_3)及其夹层化合物的合成与磁性  

Synthesis and Magnetic Properties of New Layered Ni_xMn_(1-x)PS_3 and Their Intercalation Compounds

作　　者：颜小兵[1] 陈兴国[1] 秦金贵[1] 

机构地区：[1]武汉大学化学与分子科学学院有机高分子光电功能材料湖北省重点实验室,武汉430072

出　　处：《化学学报》2011年第8期1017-1023,共7页Acta Chimica Sinica

基　　金：国家自然科学基金(No.20774071);国家科技部973课题(No.2010CB630701)资助项目

摘　　要：报道了一类具有层状结构的混合金属硫代亚磷酸锰镍(NixMn1-xPS3,0<x<1)及其两个系列夹层化合物的合成,并通过XRD、FT-IR和元素分析等对它们的结构进行了表征.在此基础上研究了它们的磁学性质,结果表明系列混合金属NixMn1-xPS3化合物均为低温反铁磁体,其磁性与两种不同金属离子的含量密切相关.相对于MnPS3或NiPS3而言,Ni2+或Mn2+的掺入能使自旋离子间的磁相互作用减弱,导致反铁磁相变温度降低;尤其当两种金属离子含量相当时(如Ni0.50Mn0.50PS3),因不同金属离子的半径及其外层电子结构的差异导致其结构无序增大,反铁磁相变温度迅速下降.此外,研究结果表明两个系列夹层化合物中,由于客体与层内Mn2+的交换产生了主体层内金属离子空位而呈现明显的稀磁效应,加上不同金属离子的半径及其外层电子结构差异影响,导致自旋金属离子的磁偶合作用明显削弱,使夹层化合物表现出顺磁特性.A series of new layered NixMn1-xPS3（0x1） compounds and two serier of the corresponding intercalation compounds based on the intercalation of 2,2＇-bipyridine and Et4N＋ ions into layered NixMn1-x-PS3（0x1）,respectively,have been synthesized and characterized by XRD,FT-IR and elemental analy-sis.The magnetic measurements indicate that all layered NixMn1-xPS3 compounds exhibit antiferromagnet-ism with different Neel temperature,which is close related to the relative ratio of N2＋ and Mn2＋ ions.Compared with pristine MnPS3 or NiPS3,the mutual doping of Mn2＋ and Ni2＋ in layered NxMn1-xPS3 seems to weaken the magnetic interaction of the metal ion spins and result in the decrement of the anti-ferromagnetic phase transition temperature.As for the corresponding intercalation compounds,the magnetic dilution of the occurrence of intralayered metal ion vacancies as well as the difference of different metal ion radius and their outer shell electronic structure can obviously weaken the magnetic interaction of the spins.Therefore,all the intercalation compounds only exhibit the paramagnetism in the whole temperature range.

关 键 词：合成 NixMn1-xPS3 夹层作用 磁性 

分 类 号：TB383.４[一般工业技术—材料科学与工程]