嵌入化合物Fe0.95PS3(MV)0.11的合成与磁性能研究

利用嵌入反应合成了有机-无机嵌入化合物Fe_0.95PS₃(MV)_{0.1 1}(MV为1,1′- 二甲基-4,4′-联吡啶阳离子)，对其结构和磁性进行了研究.x射线衍射数据表明，此嵌入化 合物的晶体结构仍为单斜晶系，空间群为C2/m，晶胞参数a=0.879 nm, b=0.944 nm, c=1.07 0 nm, β=114.76°.相对于纯FePS₃, 层间距离增大0.33 nm.磁化率研究表明， 从室温降 到4.2 K 关键词： 嵌入化合物 Mssbauer谱 磁相互作用 分子磁体

Synthesis and magnetism of the intercalation compound Fe0.95PS3< /sub>(MV)0.11

The intercalation compound Fe_0.95PS₃(MV)_0.11 (MV is the methylviol ogen cation) has been prepared. Its crystal structure and magnetism have been in vestigated by x-ray diffraction (XRD), susceptibility measurements and Mssbaue r experiments. Its XRD pattern can be indexed in a monoclinic unit cell with a=0 .879nm, b=0.944?nm, c=1.070nm, β=114.76°. The distance between layers of this intercalation compound is increased by 0.33nm compared with that of FePS_{3< /sub>. Th e data of susceptibility show that second-order magnetic phase transitions have occurred when the temperature changed from 300K down to 4.2K. A ferromagnetic ph ase transition occurred below TC=84K. An antiferromagnetic phase tran sition occurred below TN=26K. The results of Mssbauer spectra taken in the t emperatur e range of 12 to 300K indicate that there are three kinds of divalent ions with their high spin states, which imply a charge transfer from guest to the Fe—S e g antibonding orbitals of the FePS3 host lattice, and some ions have been re leased from the FePS3 host lattice and then some vacancies have been formed. T he ferromagnetism originates from a canting of the spins of Fe²⁺, whe reas the antiferromagnetism occurred when the canting of the spins of Fe²⁺ have been modified at the lowest temperatures.
Keywords： intercalation compound Mssbauer spectroscopy magnetic interaction molecular magnet}