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Compositional variation of the phonon dispersion curves of bcc Fe-Ga alloys

作     者:J. L. Zarestky V. O. Garlea T. A. Lograsso D. L. Schlagel C. Stassis 

作者机构:Ames Laboratory and Department of Physics and Astronomy Iowa State University Ames Iowa 50011 USA Ames Laboratory Materials and Engineering Physics Program Iowa State University Ames Iowa 50011 USA 

出 版 物:《Physical Review B》 (Phys. Rev. B Condens. Matter Mater. Phys.)

年 卷 期:2005年第72卷第18期

页      面:180408(R)-180408(R)页

核心收录:

学科分类:0808[工学-电气工程] 0809[工学-电子科学与技术(可授工学、理学学位)] 07[理学] 0805[工学-材料科学与工程(可授工学、理学学位)] 0702[理学-物理学] 

摘      要:Inelastic neutron scattering techniques have been used to measure the phonon dispersion curves of bcc Fe1−xGax (x=10.8, 13.3, 16.0, 22.5) alloys as a function of Ga concentration. The phonon frequencies of every branch were found to decrease significantly with increasing Ga concentration. The softening was most pronounced for the T2[ξξ0] branch and, to a lesser extent, the L[ξξξ] branch in the vicinity of ξ=23. The concentration dependence of the shear elastic constant C′=1∕2(C11−C12), calculated from the slope of the T2[ξξ0] branch, was found to agree with the results of sound velocity measurements. For the higher concentration sample measured, 22.5 at. % Ga, new branches appeared, an effect associated with the increase in the number of atoms per unit cell.

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