Features of thermal expansion in substitution alloys based on heavy rare-earth metals <span class="inline-formula"><span class="math">\({\mathbf{R}}_{{{\mathbf{1}} - x}}^{{\mathbf{I}}}{\mathbf{R}}_{x}^{{{\mathbf{II}}}}{\mathbf{F}}{{{\mathbf{e}}}_{{\mathbf{2}}}}\)</span></span>

Abstract

We consider the features of the behavior of thermal expansion and magnetostriction in magnetically ordered substitutive alloys based on heavy rare earth metals, namely: TbFe2, Tb0.8Zr0.2Fe2, Tb0.8Sm0.2Fe2 and Gd0.8Sm0.2Fe2. It is found that the of thermal expansion anomalies observed in alloys are mainly due to the competition of exchange interactions. In TbFe2 and Tb0.8Zr0.2Fe2 alloys invar-type features are observed in a wide temperature range.