The thermal expansion of single crystals of the tetragonal rare-earth intermetallics RFe 11 Ti ( R = Y, Gd, Tb, Dy or Ho) has been studied by X-ray dilatometry in the range 5± 800 K. The spontaneous volume magnetostriction x s at 5 K amounts to about 1´10 -2 , almost independent of the rare-earth component. At elevated temperatures, x s scales well with the square of the Fe magnetic moment, re¯ecting the dominant contribution of the Fe± Fe exchange interaction in the magnetostriction phenomena in these intermetallics. The magnetostriction is anisotropic; the basal-plane strain¸a far exceeds the uniaxial strain¸c. In compounds with R = Dy or Tb, a transition from a multiaxial to a uniaxial anisotropy with increasing temperature is accompanied by an additional volume e ect of about 1´10 -3 . Magnetostrictive distortion (up to 1´10 -3 at 5 K) was observed at low temperatures in the basal plane of TbFe 11 Ti.
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