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.