Abstract
The magnetic, thermal expansion and magnetostriction measurements of Gd5-xTixSi2Ge2 (x=0, 0.05, 0.1) compounds have been carried out in wide range of fields and temperatures. It is found that Ti addition leads to the disappearance of the structural transformation, the change of the order of the phase transition and the decrease of the hysteresis. The large positive magnetostriction associated with the structural phase transition in Gd5Si2Ge2 changes to the small negative one associated with the magnetic phase transition in Gd4.9Ti0.1Si2Ge2. The linear dependence of volume magnetostriction on the square of magnetization obtained for all investigated compounds is explained using the thermodynamic theory.
Highlights
The Gd5Si2Ge2 compound has attracted the considerable attention since it exhibits the giant magnetocaloric effect (MCE) [1,2]
The large magnetic and thermal hysteresis typical to the first order phase transitions leads to the difficulties in possible practical application of this compound
This large positive magnetostriction is due to magnetostructural phase transition from paramagnetic monoclinic state to ferromagnetic orthorhombic state under the action of magnetic field
Summary
The Gd5Si2Ge2 compound has attracted the considerable attention since it exhibits the giant magnetocaloric effect (MCE) [1,2]. The structural and magnetic transformations occurring simultaneously at Curie temperature lead to the first order phase transition from paramagnetic monoclinic state to ferromagnetic orthorhombic state. The large magnetic and thermal hysteresis typical to the first order phase transitions leads to the difficulties in possible practical application of this compound. The influence of small Sn and In substitutions on the magnetostructural phase transitions have been studied in detail [3,4,5]. These studies have shown that the Curie temperature slightly shifts by not more than 10 K, the first order phase transition is preserved and MCE slightly increases with small p-element addition. In this work the magnetic, thermal expansion and magnetostriction measurements of Gd5-xTixSi2Ge2 (x=0, 0.05, 0.1) compounds have been carried out in order to determine the influence of the temperature and magnetic field on the magnetoelastic properties of these alloys
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