Magnetostrictive distortion in Pr_0.15Tb_xDy_0.85-xFe₂ polycrystals by X-ray diffraction^①

来源期刊：中南大学学报(英文版)2005年第1期

论文作者：孟凡斌 李养贤 陈贵锋 刘何燕 曲静萍 陈京兰 吴光恒

文章页码：39 - 41

Key words：magnetostriction; distortion; 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 λ₁₁₁was calculated. The results show when the temperature is raised above the spin reorientation temperature region, a splitting appears in the reflection (440); the λ₁₁₁increase 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, theλ111decreases slightly with the increasing of temperature at the temperature region of 223 373 K for Pr_0.15Tb_0.3Dy_0.55Fe₂ alloy.