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Title: Effects of doping, hydrostatic pressure, and thermal quenching on the phase transitions and magnetocaloric properties in Mn1–xCoxNiGe

Abstract

The effects of doping, hydrostatic pressure, and thermal quenching on the phase transitions and magnetocaloric properties of the Mn1–xCoxNiGe system have been investigated. Cobalt doping on the Mn site shifted the martensitic structural transition toward lower temperature until it was ultimately absent, leaving only a magnetic transition from a ferromagnetic (FM) to a paramagnetic (PM) state in the high-temperature hexagonal phase. Co-occurrence of the magnetic and structural transitions to form a first-order magnetostructural transition (MST) from the FM orthorhombic to the PM hexagonal phase was observed in samples with 0.05 < x < 0.20. An additional antiferromagnetic–ferromagnetic-like transition was observed in the martensite phase for 0.05 < x < 0.10, which gradually vanished with increasing Co concentration (x > 0.10) or magnetic field (H > 0.5 T). The application of external hydrostatic pressure shifted the structural transition to lower temperature until an MST was formed in samples with x = 0.03 and 0.05, inducing large magnetic entropy changes up to –80.3 J kg–1 K–1 (x = 0.03) for a 7-T field change under 10.6-kbar pressure. Similar to the effects of the application of hydrostatic pressure, an MST was formed near room temperature in the sample with x = 0.03 bymore » annealing at high temperature (1200 °C) followed by quenching, resulting in a large magnetic entropy change of –56.2 J kg–1 K–1. Furthermore, these experimental results show that the application of pressure and thermal quenching, in addition to compositional variations, are effective methods to create magnetostructural transitions in the MnNiGe system, resulting in large magnetocaloric effects.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [2];  [2];  [2];  [1]
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  1. Louisiana State University, Baton Rouge, LA (United States)
  2. Southern Illinois University, Carbondale, IL (United States)
Publication Date:
Research Org.:
Louisiana State Univ., Baton Rouge, LA (United States); Southern Illinois Univ., Carbondale, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1975225
Alternate Identifier(s):
OSTI ID: 1878255
Grant/Contract Number:  
FG02-13ER46946; SC0010521
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 132; Journal Issue: 4; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; magnetocaloric; barocaloric; magnetic refrigeration; phase transitions; magnetism; alloys; materials heat treatment

Citation Formats

Chhetri, Tej Poudel, Chen, Jing-Han, Grant, Anthony T., Young, David P., Dubenko, Igor, Talapatra, Saikat, Ali, Naushad, and Stadler, Shane. Effects of doping, hydrostatic pressure, and thermal quenching on the phase transitions and magnetocaloric properties in Mn1–xCoxNiGe. United States: N. p., 2022. Web. doi:10.1063/5.0100987.
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Chhetri, Tej Poudel, Chen, Jing-Han, Grant, Anthony T., Young, David P., Dubenko, Igor, Talapatra, Saikat, Ali, Naushad, & Stadler, Shane. Effects of doping, hydrostatic pressure, and thermal quenching on the phase transitions and magnetocaloric properties in Mn1–xCoxNiGe. United States. https://doi.org/10.1063/5.0100987
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Chhetri, Tej Poudel, Chen, Jing-Han, Grant, Anthony T., Young, David P., Dubenko, Igor, Talapatra, Saikat, Ali, Naushad, and Stadler, Shane. Wed . "Effects of doping, hydrostatic pressure, and thermal quenching on the phase transitions and magnetocaloric properties in Mn1–xCoxNiGe". United States. https://doi.org/10.1063/5.0100987. https://www.osti.gov/servlets/purl/1975225.
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@article{osti_1975225,
title = {Effects of doping, hydrostatic pressure, and thermal quenching on the phase transitions and magnetocaloric properties in Mn1–xCoxNiGe},
author = {Chhetri, Tej Poudel and Chen, Jing-Han and Grant, Anthony T. and Young, David P. and Dubenko, Igor and Talapatra, Saikat and Ali, Naushad and Stadler, Shane},
abstractNote = {The effects of doping, hydrostatic pressure, and thermal quenching on the phase transitions and magnetocaloric properties of the Mn1–xCoxNiGe system have been investigated. Cobalt doping on the Mn site shifted the martensitic structural transition toward lower temperature until it was ultimately absent, leaving only a magnetic transition from a ferromagnetic (FM) to a paramagnetic (PM) state in the high-temperature hexagonal phase. Co-occurrence of the magnetic and structural transitions to form a first-order magnetostructural transition (MST) from the FM orthorhombic to the PM hexagonal phase was observed in samples with 0.05 < x < 0.20. An additional antiferromagnetic–ferromagnetic-like transition was observed in the martensite phase for 0.05 < x < 0.10, which gradually vanished with increasing Co concentration (x > 0.10) or magnetic field (H > 0.5 T). The application of external hydrostatic pressure shifted the structural transition to lower temperature until an MST was formed in samples with x = 0.03 and 0.05, inducing large magnetic entropy changes up to –80.3 J kg–1 K–1 (x = 0.03) for a 7-T field change under 10.6-kbar pressure. Similar to the effects of the application of hydrostatic pressure, an MST was formed near room temperature in the sample with x = 0.03 by annealing at high temperature (1200 °C) followed by quenching, resulting in a large magnetic entropy change of –56.2 J kg–1 K–1. Furthermore, these experimental results show that the application of pressure and thermal quenching, in addition to compositional variations, are effective methods to create magnetostructural transitions in the MnNiGe system, resulting in large magnetocaloric effects.},
doi = {10.1063/5.0100987},
journal = {Journal of Applied Physics},
number = 4,
volume = 132,
place = {United States},
year = {Wed Jul 27 00:00:00 EDT 2022},
month = {Wed Jul 27 00:00:00 EDT 2022}
}
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