Journal ArticleDOI
Structural and Magnetic Properties of MnFe $_1 - rm x$ Co $_rm x$ Ge Compounds
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TLDR
The structural and magnetic properties of MnFe1-xCoxGe compounds with x=0,0.1, 0.3, 0,4, 0.,5,0,6,0.,7,0 and 1.0 were investigated by means of X-ray diffraction (XRD) and magnetization measurements.Abstract:
The structural and magnetic properties of MnFe1-xCoxGe compounds with x=0,0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.85,0.9, and 1.0 were investigated by means of X-ray diffraction (XRD) and magnetization measurements. XRD shows that the MnFe1-xCoxGe compounds crystallize in the hexagonal Ni2In-type crystal structure for xles0.8 and in the orthorhombic NiTiSi-type structure for x>0.8. The magnetization measurements show that the MnFe1-xCoxGe compounds exhibit a complex magnetic behavior. The Curie temperature increases with increasing of x. The saturation magnetization of the compounds with Ni2In type structure increase with increasing of x and the saturation of the magnetization in the NiTiSi-type structure also increases with increasing x. We investigated the magnetocaloric effects in these compounds by means of magnetization measurements. The maximum magnetic-entropy change observed in these compounds reaches 9 J/kgK for x=0.8 in a field change from 0 to 5 T at around 289 Kread more
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Magnetocaloric effect: From materials research to refrigeration devices
TL;DR: The magnetocaloric effect and its most straightforward application, magnetic refrigeration, are topics of current interest due to the potential improvement of energy efficiency of cooling and temperature control systems, in combination with other environmental benefits associated to a technology that does not rely on the compression/expansion of harmful gases.
Journal ArticleDOI
The Magnetocaloric Effect and Magnetic Refrigeration Near Room Temperature: Materials and Models
TL;DR: In this paper, a review of the magnetocaloric response of materials for magnetic refrigeration close to room temperature is presented, focusing on the main families of materials suitable for this application and the procedures proposed to predict their response.
Journal ArticleDOI
Giant magnetocaloric effects by tailoring the phase transitions
TL;DR: In this article, a giant magnetocaloric effect associated with a single first-order magnetostructural phase transition was found for the MnCoGe alloy, which can be achieved by tuning the magnetic and structural transitions to coincide.
Journal ArticleDOI
From single- to double-first-order magnetic phase transition in magnetocaloric Mn1−xCrxCoGe compounds
TL;DR: Substitution of some Cr for Mn atoms in MnCoGe was employed to control the magnetic and structural transitions in this alloy to coincide, leading to a single first-order magnetostructural transition from the ferromagnetic to the paramagnetic state with a giant magnetocaloric effect observed near room temperature as discussed by the authors.
Journal ArticleDOI
A review on Mn based materials for magnetic refrigeration: Structure and properties
TL;DR: In this article, the magnetic and magnetocaloric properties of a large number of intermetallic compounds were investigated, in which the magnetic moments are carried by atoms of 3D transition elements.
References
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Journal ArticleDOI
Transition-metal-based magnetic refrigerants for room-temperature applications
TL;DR: The discovery of a large magnetic entropy change is reported in MnFeP0.45As0.55, a material that has a Curie temperature of about 300 K and which allows magnetic refrigeration at room temperature, attributed to a field-induced first-order phase transition enhancing the effect of the applied magnetic field.
Journal ArticleDOI
Giant magnetocaloric effect of MnAs1−xSbx
Hirofumi Wada,Y. Tanabe +1 more
TL;DR: In this paper, a giant magnetocaloric effect was found in MnAs, which undergoes a first-order ferromagnetic to paramagnetic transition at 318 K, and the magnetic entropy change caused by a magnetic field of 5 T is as large as 30 J/K kg at the maximum value, which exceeds that of conventional magnetic refrigerant materials by a factor of 2-4.
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Magnetic-phase transitions and magnetocaloric effects
TL;DR: In this paper, the magnetocaloric properties of a variety of compounds, like Gd5(Si1−xGex)4 with x=0.576 and 0.5875, MnFeP1+xAsx with x between 0.25 and0.65, RTiGe with R=Tb, Dy, Ho, Er and Tm, Ni53Mn22Ga25, Mn5Si3, and Mn1.95Cr0.05Sb, were studied.
Journal ArticleDOI
Magneto-volume effect of MnCo1-xGe(0≤x≤0.2)
TL;DR: In this article, the pressure effect on the Curie temperature and thermal expansion for MnCoGe and MnCo0.8Ge was measured and the results showed that negative exchange striction was observed for the unit cell volume.
Journal ArticleDOI
Crystal and magnetic structure of CoMnGe, CoFeGe, FeMnGe and NiFeGe
TL;DR: In this article, the crystal and magnetic properties of CoMnGe, CoFeGe, FeMnG, and NiFeGe compounds are investigated with X-ray, neutron diffraction, magnetometric and Mossbauer effect methods.