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Structure and magnetic properties of

1996; IOP Publishing; Volume: 8; Issue: 11 Linguagem: Inglês

10.1088/0953-8984/8/11/027

1361-648X

Y.G. Wang, Fuming Yang, Changpin Chen, Ning Tang, Jianli Wang, Xingguo Han, Hongge Pan, Jifan Hu, Kaiwen Zhou, Ruwen Zhao, Qidong Wang,

Magnetic Properties and Synthesis of Ferrites

compounds with x = 0, 0.5, 1.0, 1.5 and 2.0 have been studied in this paper. All compounds crystallize in the -type structure (space group, P6/mmm). The substitution of Ti for Mn in results in a linear increase in the lattice constants and the unit-cell volume from a = 5.531 Å, c = 9.025 Å and V = 239.10 at x = 0, to a = 5.588 Å, c = 9.150 Å and V = 247.44 at x = 2.0. The ordering temperature and the reorientation temperature of the easy axis of these compounds decrease monotonically with Ti content from 423 K and 330 K at x = 0 to 362 K and 285 K at x = 2.0. In thermal magnetic curves a new transition was found at the temperature at which the magnetization begin to increase and increases from 37 K at x = 0 to 150 K at x = 2.0. The saturation magnetization at room temperature decreases linearly with increasing Ti content. The magnetization curves at 1.5 K in fields up to 70 kOe are given and the magnetization values at 1.5 K are derived from them.