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Title: Stability of magnetocaloric La(Fe x Co y Si 1-x-y ) 13 in water and air

Abstract

Stability of cobalt-doped lanthanum iron silicide, La(Fe x Co y Si 1-x-y ) have been investigated under conditions required for magnetocaloric refrigeration. The XRD analysis revealed that both milled and non-milled samples stored in water loose a few Bragg peaks corresponding to the NaZn13 phase of La(Fe x Co y Si 1-x-y ) . Samples stored in air show well-defined Bragg peaks similar to that of pristine material. The SEM-EDS of the milled and non-milled samples stored in water and air show an increased concentration of oxygen in the samples, particularly those treated with water. The course non-milled powders kept in air and water show sharp transitions at the Curie temperature T C = 300K without large magnetization above the T C. The milled, fine-particulate sample stored in air shows a slightly broadened transition at T C, and that stored in deionized water for 14 days shows significantly broadened transition from 300K and retains large magnetizations above 400 K. This is indicative of relatively fast hydrolysis and removal of some or all of La, likely as hydroxide, from fine powders, leaving behind La-poor or, potentially, La-free Fe-Co-Si containing ferromagnetic residue with much higher Curie temperature. The non-milled course sample storedmore » in water exhibits sharper magnetic transition and higher magnetization hence it shows the highest entropy change among all 4 type of samples.« less

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [1]
  1. Virginia Commonwealth Univ., Richmond, VA (United States)
  2. Ames Laboratory (AMES), Ames, IA (United States)
  3. Ames Laboratory (AMES), Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE
OSTI Identifier:
1506099
Alternate Identifier(s):
OSTI ID: 1501733
Report Number(s):
IS-J-9226
Journal ID: ISSN 2158-3226
Grant/Contract Number:  
1357565; 1610967; 1726617; AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 9; Journal Issue: 3; Journal ID: ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Javed, Khushar, Gupta, Shalabh, Pecharsky, Vitalij K., and Hadimani, Ravi L. Stability of magnetocaloric La(Fe x Co y Si 1-x-y ) 13 in water and air. United States: N. p., 2019. Web. doi:10.1063/1.5080108.
Javed, Khushar, Gupta, Shalabh, Pecharsky, Vitalij K., & Hadimani, Ravi L. Stability of magnetocaloric La(Fe x Co y Si 1-x-y ) 13 in water and air. United States. doi:10.1063/1.5080108.
Javed, Khushar, Gupta, Shalabh, Pecharsky, Vitalij K., and Hadimani, Ravi L. Tue . "Stability of magnetocaloric La(Fe x Co y Si 1-x-y ) 13 in water and air". United States. doi:10.1063/1.5080108. https://www.osti.gov/servlets/purl/1506099.
@article{osti_1506099,
title = {Stability of magnetocaloric La(Fe x Co y Si 1-x-y ) 13 in water and air},
author = {Javed, Khushar and Gupta, Shalabh and Pecharsky, Vitalij K. and Hadimani, Ravi L.},
abstractNote = {Stability of cobalt-doped lanthanum iron silicide, La(Fe x Co y Si 1-x-y ) have been investigated under conditions required for magnetocaloric refrigeration. The XRD analysis revealed that both milled and non-milled samples stored in water loose a few Bragg peaks corresponding to the NaZn13 phase of La(Fe x Co y Si 1-x-y ) . Samples stored in air show well-defined Bragg peaks similar to that of pristine material. The SEM-EDS of the milled and non-milled samples stored in water and air show an increased concentration of oxygen in the samples, particularly those treated with water. The course non-milled powders kept in air and water show sharp transitions at the Curie temperature TC = 300K without large magnetization above the TC. The milled, fine-particulate sample stored in air shows a slightly broadened transition at TC, and that stored in deionized water for 14 days shows significantly broadened transition from 300K and retains large magnetizations above 400 K. This is indicative of relatively fast hydrolysis and removal of some or all of La, likely as hydroxide, from fine powders, leaving behind La-poor or, potentially, La-free Fe-Co-Si containing ferromagnetic residue with much higher Curie temperature. The non-milled course sample stored in water exhibits sharper magnetic transition and higher magnetization hence it shows the highest entropy change among all 4 type of samples.},
doi = {10.1063/1.5080108},
journal = {AIP Advances},
number = 3,
volume = 9,
place = {United States},
year = {2019},
month = {3}
}

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