Magnetic and magnetocaloric properties of (MnCo)(1-x) Ge compounds / Markin P. E.,Mushnikov N. V.,Gerasimov E. G.,Proshkin A. V.,Volegov A. S. // PHYSICS OF METALS AND METALLOGRAPHY. - 2013. - V. 114, l. 11. - P. 893-903.

ISSN/EISSN:

0031-918X / 1555-6190

Type:

Article

Abstract:

The crystal structure, magnetic properties, and heat capacity of the (MnCo)(1 - x) Ge compounds with x a parts per thousand currency sign 0.05 have been studied. It was found that, as the deviation from the MnCoGe stoichiometric composition increases, the temperature of structural transition from the low-temperature phase with the orthorhombic TiNiSi-type structure to the high-temperature phase with the hexagonal Ni2In-type phase decreases rapidly, whereas the magnetic ordering temperature varies slightly. The temperature of structural transition for the composition with x = 0.02 approximately coincides with the Curie temperature of the hexagonal phase, and the transition is accompanied by a significant entropy change, namely, Delta S = 34 J/(kg K). The application of high magnetic field in the transition-temperature range causes an increase in the relative volume of the orthorhombic phase. An analysis of magnetocaloric properties of these compounds, which was performed with the formal application of the Maxwell's relationship near the temperature of first-order structural phase transition, is shown to give overestimated values of the entropy change.

Author keywords:

intermetallic compounds; structural transition; X-ray diffraction; heat capacity; magnetocaloric effect ADIABATIC TEMPERATURE-CHANGE; MARTENSITIC-TRANSFORMATION; ENTROPY CHANGE; GD5SI2GE2; TRANSITIONS; FIELD; MNCO1-XGE

DOI:

10.1134/S0031918X13110082

Web of Science ID:

ISI:000326715800002

Соавторы в МНС:

Другие поля

Поле	Значение
Month	NOV
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
EISSN	1555-6190
Keywords-Plus	ADIABATIC TEMPERATURE-CHANGE; MARTENSITIC-TRANSFORMATION; ENTROPY CHANGE; GD5SI2GE2; TRANSITIONS; FIELD; MNCO1-XGE
Research-Areas	Metallurgy \& Metallurgical Engineering
Web-of-Science-Categories	Metallurgy \& Metallurgical Engineering
Author-Email	pmarkin@imp.uran.ru
ResearcherID-Numbers	Markin, Pavel/K-7088-2013 Gerasimov, Evgeny/J-3599-2013
ORCID-Numbers	Markin, Pavel/0000-0002-9537-2303 Gerasimov, Evgeny/0000-0002-1975-705X
Funding-Acknowledgement	Russian Foundation for Basic Research {[}12-02-00864, 13-02-96022]; Government of Sverdlovsk region; Presidium of the Ural Branch, Russian Academy of Sciences {[}12-T-2-1012]
Funding-Text	This study was supported in part by the Russian Foundation for Basic Research (projects nos. 12-02-00864 and 13-02-96022), Government of Sverdlovsk region, and by the Presidium of the Ural Branch, Russian Academy of Sciences (project no. 12-T-2-1012).
Number-of-Cited-References	29
Usage-Count-Last-180-days	5
Usage-Count-Since-2013	37
Journal-ISO	Phys. Metals Metallogr.
Doc-Delivery-Number	248QI