Magnetostrictive distortion in Pr_0.15Tb_xDy_0.85−xFe₂ polycrystals by X-ray diffraction

Abstract

The ingots of Pr_0.15Tb_xDy_0.85−xFe₂ (x = 0.10 − 0.85) series compounds with a single phase were prepared by a arc melting method. The X-ray diffraction patterns were measured using a Philips X’pert MPD X-ray diffractometer with a non-ambient sample stage at different temperatures, the magnetostrictive distortion in Pr_0.15Tb_xDy_0.85−xFe₂ polycrystals was investigated by X-ray diffraction patterns and the magnetostriction coefficient λ₁₁₁ was calculated. The results show when the temperature is raised above the spin reorientation temperature region, a splitting appears in the reflection (440); the λ₁₁₁ increase with the increasing of Tb content for Pr_0.15Tb_xDy_0.85−xFe₂ polycrystals and the full width at half maximum (FWHM) of the reflection (440) increases gradually with the increasing of Tb content. Moreover, as the FWHM of the reflection (440) decreases gradually with the increasing of temperature, the λ₁₁₁ decreases slightly with the increasing of temperature at the temperature region of 223 – 273 K for Pr_0.15Tb_0.3Dy_0.55Fe₂ alloy.

Keywords

magnetostriction / distortion / X-ray diffraction