Specific Heat of MnCoGe Type Compounds at Martensitic Phase Transitions

P.E. Markin; N.V. Mushnikov; A.V. Proshkin; S.V. Belyaev

doi:10.4028/www.scientific.net/SSP.190.331

Paper Titles

The Effect of Structural State on Magnetic and Magnetocaloric Properties of Micro-and Nanocrystalline Gd
p.315

Numerical Simulation of Magnetic Cooling Cycles
p.319

The Magnetocaloric Effect in Two-Phase Y-Fe Nanocrystalline Alloys
p.323

Theoretical Study of Twin Boundary Motion in Heusler Ni-Mn-Ga Alloys Using Monte Carlo Method
p.327

Specific Heat of MnCoGe Type Compounds at Martensitic Phase Transitions
p.331

Magneto-Optical Spectroscopy of Heusler Alloys: Bulk Samples, Thin Films and Microwires
p.335

Magnetocaloric Effect in RСo₂ Compounds
p.339

Giant Magnetocaloric Effect in the Region of Magnetic Phase Transition in Mn (As,Sb) Compounds
p.343

Monte Carlo Study of the Magnetic and Magnetocaloric Properties of La₁-_xCa_xMnO₃ (x = 0.33 and 0.5)
p.347

HomeSolid State PhenomenaSolid State Phenomena Vol. 190Specific Heat of MnCoGe Type Compounds at...

Specific Heat of MnCoGe Type Compounds at Martensitic Phase Transitions

Abstract:

The X-ray diffraction and specific heat measurements have been performed for the ferromagnetic compounds (MnCo)_1-xGe within the concentration range 0.02 x 0.035. The compounds possess the hexagonal Ni₂In-type structure at elevated temperatures, while for the composition with x = 0.02 and 0.03 a spontaneous martensitic-type transition to the orthorhombic TiNiSi-type phase occurs at 283 and 221 K, respectively. We studied the entropy changes associated with the first-order structural transition and estimated the changes in magnetic, lattice, electronic entropies.

You might also be interested in these eBooks

View Preview

Info:

Periodical:

Solid State Phenomena (Volume 190)

Pages:

331-334

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.190.331

Citation:

Cite this paper

Online since:

June 2012

Authors:

P.E. Markin, N.V. Mushnikov, A.V. Proshkin, S.V. Belyaev

Keywords:

Intermetallic Compound (IMC), Magnetocaloric Effect, Structural Transformation

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

References

[1] K.A. Gschneidner Jr., V.K. Pecharsky, A.O. Tsokol, Recent developments in magnetocaloric materials, Rep. Progr. Phys., 68 (2005), 1479-1539.

DOI: 10.1088/0034-4885/68/6/r04

Google Scholar

[2] O. Tegus, E. Brück, L. Zhang, W. Dagula, K.H.J. Buschow, F.R. de Boer, Magnetic phase transitions and magnetocaloric effects, Physica B, 319 (2002) 174-192.

DOI: 10.1016/s0921-4526(02)01119-5

Google Scholar

[3] L. Jia, G.J. Liu, J.R. Sun. et al., Entropy changes associated with the first-order magnetic transitions in LaFe13-xSix, J. Appl. Phys., 100 (2006) 123904-1-5.

DOI: 10.1063/1.2404468

Google Scholar

[4] V. Johnson, Diffusionless orthorhombic to hexagonal transitions in ternary silicides and germanides, Inorg. Chem., 14 (1975) 1117-1120.

DOI: 10.1021/ic50147a032

Google Scholar

[5] S. Nizol, A. Bombik, W. Bazela, et al., Crystal and magnetic structure of CoxNi1-xMnGe system, J. Magn. Magn. Mater., 27 (1982) 281-292.

Google Scholar

[6] T. Kanomata, H. Ishigaki, T. Suzuki, et. al., Magneto-volume effect of MnCo1-xGe (0 ≤ x ≤ 0. 2), J. Magn. Magn. Mater., 140-144 (1995) 131-132.

DOI: 10.1016/0304-8853(94)00833-7

Google Scholar

[7] P.E. Markin, N.V. Mushnikov, V.I. Khrabrov, M.A. Korotin, Magnetic properties of the Mn1. 9-xCoxGe compounds with a hexagonal crystal structure, Phys. Met. Metallogr., 106 (2008) 481-489.

DOI: 10.1134/s0031918x08110070

Google Scholar

[8] J.T. Wang, D.S. Wang, C. Chen, et al., Vacancy induced structural and magnetic transition in MnCo1-xGe, Appl. Phys. Lett., 89 (2006) 262504-1-3.

DOI: 10.1063/1.2424273

Google Scholar

[9] A. Szytula, W. Bazela, S. Radenkovic, Crystal and magnetic structure of the CoMn1-xTixGe system, J. Magn. Magn. Mater., 38 (1983) 99-104.

Google Scholar

[10] M. Bouvier, P. Lethuillier, D. Schmitt, Specific heat in some gadolinium compounds, Phys. Rev. B., 43 (1991) 13137-13144.

DOI: 10.1103/physrevb.43.13137

Google Scholar