Magnetostructural Transition and Magnetocaloric Effect with Negligible Magnetic Hysteresis in MnCoGe1.02−xGax Alloys

Abstract

The behavior of magnetostructural transition and the magnetocaloric effect in the MnCoGe1.02−xGax (x = 0, 0.02, 0.04, 0.06) alloys are investigated in this study. The addition of Ga changes the crystal structure of MnCoGe1.02−xGax alloys at room temperature and reduces the phase transition temperatures with increasing Ga content. The coupling of magnetostructural transition and negligible magnetic hysteresis is observed in the Mn-Co-Ge-Ga alloy. At 305 K, under the action of a 5 T magnetic field, the MnCoGeGa0.02 alloy exhibits 23.47 J/kg∙K magnetic entropy change, and its refrigeration capacity reaches 387 J/kg. The large magnetic entropy change near room temperature and the high refrigeration capacity in the Mn-Co-Ge-Ga alloy make it a promising new type of refrigeration material.

Correlation between electronic and magnetic properties of LaMnO 3-δ : experimental study and DFT-MBJ calculation

“…A very wide range of new properties can be obtained following the substitution in the A or / and B sites of the compound LaMnO 3 [1][2][3][4]. This family of compound ABO 3 has become a major concern for both scientists and industrialists concerned with such elds as magnetic refregeration [5], photonics [6], advanced materials surface [7], catalytic systems and protection coating [8]. Relying upon reported literature, there are many factors that can affect the physical properties of this family such as the preparation method [9], the doped effect of A or B site [10], the effect of lacuna on A site or the lacuna creation in oxygen [11].…”