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Title: Magnetocaloric Effect of Micro- and Nanoparticles of Gd5Si4

Abstract

We report that materials exhibiting a large magnetocaloric effect (MCE) at or near room temperature are critical for solid-state refrigeration applications. The MCE is described by a change in entropy (ΔSM) and/or temperature (ΔTad) of a material in response to a change in applied magnetic field. Ball milled materials generally exhibit smaller ΔSM values compared to bulk; however, milling broadens the effect, potentially increasing the relative cooling power (RCP). The as-cast Gd5Si4 is an attractive option due to its magnetic transition at 340 K and associated MCE. Investigation of effect of particles size and transition temperature in the binary material, Gd5Si4, can lead to development of functionally graded bulk material with higher MCE and RCP than the traditional bulk materials. A two-step ball-milling process, in which coarse powder of Gd5Si4 was first milled with poly(ethylene glycol) followed by milling in heptane was used to produce fine particles of Gd5Si4 that showed a broad distribution in particle size. Magnetic measurement on the milled sample obtained after washing with water show a decrease in Curie temperature and significant broadening of the magnetic transition. Compared to bulk Gd5Si4, the maximum MCE of the milled samples is also reduced and shifted down by closemore » to 30 K, but the MCE remains substantial over a broader temperature range. Lastly, the RCP of both milled samples increased 75% from the bulk material.« less

Authors:
 [1];  [2];  [3];  [4]; ORCiD logo [1]
  1. Virginia Commonwealth Univ., Richmond, VA (United States)
  2. Virginia Commonwealth Univ., Richmond, VA (United States); Univ. of Texas, El Paso, TX (United States)
  3. Ames Lab., Ames, IA (United States)
  4. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1556924
Report Number(s):
IS-J-9989
Journal ID: ISSN 1047-4838
Grant/Contract Number:  
AC02-07CH11358; 1726617; 1357565
Resource Type:
Accepted Manuscript
Journal Name:
JOM. Journal of the Minerals, Metals & Materials Society
Additional Journal Information:
Journal Volume: 71; Journal Issue: 9; Journal ID: ISSN 1047-4838
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Harstad, S. M., El-Gendy, A. A., Gupta, S., Pecharsky, V. K., and Hadimani, R. L. Magnetocaloric Effect of Micro- and Nanoparticles of Gd5Si4. United States: N. p., 2019. Web. doi:10.1007/s11837-019-03626-1.
Harstad, S. M., El-Gendy, A. A., Gupta, S., Pecharsky, V. K., & Hadimani, R. L. Magnetocaloric Effect of Micro- and Nanoparticles of Gd5Si4. United States. doi:10.1007/s11837-019-03626-1.
Harstad, S. M., El-Gendy, A. A., Gupta, S., Pecharsky, V. K., and Hadimani, R. L. Tue . "Magnetocaloric Effect of Micro- and Nanoparticles of Gd5Si4". United States. doi:10.1007/s11837-019-03626-1. https://www.osti.gov/servlets/purl/1556924.
@article{osti_1556924,
title = {Magnetocaloric Effect of Micro- and Nanoparticles of Gd5Si4},
author = {Harstad, S. M. and El-Gendy, A. A. and Gupta, S. and Pecharsky, V. K. and Hadimani, R. L.},
abstractNote = {We report that materials exhibiting a large magnetocaloric effect (MCE) at or near room temperature are critical for solid-state refrigeration applications. The MCE is described by a change in entropy (ΔSM) and/or temperature (ΔTad) of a material in response to a change in applied magnetic field. Ball milled materials generally exhibit smaller ΔSM values compared to bulk; however, milling broadens the effect, potentially increasing the relative cooling power (RCP). The as-cast Gd5Si4 is an attractive option due to its magnetic transition at 340 K and associated MCE. Investigation of effect of particles size and transition temperature in the binary material, Gd5Si4, can lead to development of functionally graded bulk material with higher MCE and RCP than the traditional bulk materials. A two-step ball-milling process, in which coarse powder of Gd5Si4 was first milled with poly(ethylene glycol) followed by milling in heptane was used to produce fine particles of Gd5Si4 that showed a broad distribution in particle size. Magnetic measurement on the milled sample obtained after washing with water show a decrease in Curie temperature and significant broadening of the magnetic transition. Compared to bulk Gd5Si4, the maximum MCE of the milled samples is also reduced and shifted down by close to 30 K, but the MCE remains substantial over a broader temperature range. Lastly, the RCP of both milled samples increased 75% from the bulk material.},
doi = {10.1007/s11837-019-03626-1},
journal = {JOM. Journal of the Minerals, Metals & Materials Society},
number = 9,
volume = 71,
place = {United States},
year = {2019},
month = {7}
}

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    Works referencing / citing this record:

    Influence of A-Site cation size-disorder on the magnetocaloric response of La 0.6 Ca x Sr 0.4-x MnO 3 nanoparticles
    journal, January 2020

    • Hunt, C. S. M.; Barua, R.; Carpenter, E. E.
    • AIP Advances, Vol. 10, Issue 1
    • DOI: 10.1063/1.5129905

    Differential effect of magnetic alignment on additive manufacturing of magnetocaloric particles
    journal, January 2020

    • Al-Milaji, Karam N.; Gupta, Shalabh; Pecharsky, Vitalij K.
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