Title: Phase Transitions and Magnetocaloric Properties in MnCo _1−x Zr _x Ge Compounds

Abstract

The structural, magnetic, and magnetocaloric properties of $\text{MnC}{\text{o}}_{1-x}\text{Z}{\text{r}}_x\text{Ge}$( $0.01\le x\le 0.04$) have been studied through X-ray diffraction, differential scanning calorimetry, and magnetization measurements. Results indicate that the partial substitution of Zr for Co in $\text{MnC}{\text{o}}_{1-x}\text{Z}{\text{r}}_x\text{Ge}$ decreases the martensitic transition temperature ( $T_M$). For $x$= 0.02, $T_M$ was found to coincide with the ferromagnetic transition temperature ( $T_C$) resulting in a first-order magnetostructural transition (MST). A further increase in zirconium concentration ( $x$= 0.04) showed a single transition at $T_C$. The MST from the paramagnetic to ferromagnetic state results in magnetic entropy changes ( $-\mathrm{\Delta }{S}_M$) of 7.2 J/kgK for $\mathrm{\Delta }H$= 5 T at 274 K for $x$= 0.02. The corresponding value of the relative cooling power (RCP) was found to be 266 J/kg for $\mathrm{\Delta }H$= 5 T. Thus, the observed large value of MCE and RCP makes this system a promising material for magnetic cooling applications.

Authors:

Aryal, Anil  ^[1];

• Search DOE PAGES for author "Aryal, Anil"
• Search DOE PAGES for ORCID "0000-0003-0095-2565"

Quetz, Abdiel ^[1]; Pandey, Sudip  ^[1];

• Search DOE PAGES for author "Pandey, Sudip"
• Search DOE PAGES for ORCID "0000-0003-1483-6231"

Dubenko, Igor ^[1]; Stadler, Shane ^[2]; Ali, Naushad ^[1]

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+ Show Author Affiliations

1. Southern Illinois Univ., Carbondale, IL (United States). Dept. of Physics
2. Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Physics and Astronomy

Publication Date:

Tue Jun 13 00:00:00 EDT 2017

Research Org.:

Southern Illinois Univ., Carbondale, IL (United States); Louisiana State Univ., Baton Rouge, LA (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:

1363725

Alternate Identifier(s):

OSTI ID: 1430123

Grant/Contract Number:  

FG02-06ER46291; FG02-13ER46946

Resource Type:

Published Article

Journal Name:

Advances in Condensed Matter Physics

Additional Journal Information:

Journal Name: Advances in Condensed Matter Physics Journal Volume: 2017; Journal ID: ISSN 1687-8108

Publisher:

Hindawi

Country of Publication:

Egypt

Language:

English

Subject:

30 DIRECT ENERGY CONVERSION; 36 MATERIALS SCIENCE