Spontaneous Magnetostriction of Nd<,2>AlFe<,14>Mn<,2> Compound
Compound of Nd<,2>AlFe<,14>Mn<,2> was prepared by arc melting in an argon atmosphere of high purity. The negative thermal expansion and spontaneous magnetostrictive deformations of Nd<,2>AlFe<,14>Mn <,2> compound were investigated by means of x-ray diffraction and magnetization measurements. It indicates that the Nd<,2>AlFe<,14>Mn<,2> compound has a rhombohedral Th<,2>Zn<,17>-type structure from 104 to 655K.X-ray diffraction of Nd<,2>AlFe<,14>Mn<,2> compound from 263 to 364K shows that a negative coefficient of thermal expansion exists, α=2.44×10<- 5>K<-1> The dependences of unit-cell parameters of Nd<,2> AlFe<,14>Mn<,2> compound versus temperature at the paramagnetic state were obtained according to Debye theory and Gruneisen relation. There exists a strong and anisotropic spontaneous magnetostriction in the magnetic state of Nd<,2> AlFe<,14>Mn<,2> compound. The result of magnetization measurements shows that the Curie temperature of Nd<,2>AlFe <,14>Mn<,2> compound is about 140K lower than the mother compound Nd<,2>AlFe<,16>. This is probably a consequence of the magnetic moment of Mn atom being antiparallel to the magnetic moment of Fe atom in 3d-sublattice.
Nd<,2>AlFe<,14>Mn<,2> compound negative thermal expansion spontaneous magnetostriction rare earths
TAN Ming YAN Dali ZHAO Miao FU Bin HAO Yanming
Department of Physics, Tianjin Normal University, Tianjin 300387, China College of Science, Tianjin University of Science & Technology, Tianjin 300457, China
国际会议
2007年中国科协科技年会(The Annual Conference of the China Association for Science and Technology)
武汉
英文
223-225
2007-09-08（万方平台首次上网日期，不代表论文的发表时间）