Magnetocaloric Effect of Micro- and Nanoparticles of Gd5Si4

Harstad, S. M.; El-Gendy, A. A.; Gupta, S.; Pecharsky, V. K.; Hadimani, R. L.

doi:10.1007/s11837-019-03626-1

Title: Magnetocaloric Effect of Micro- and Nanoparticles of Gd₅Si₄

Journal Article · 01 July 2019 · JOM. Journal of the Minerals, Metals & Materials Society

DOI: https://doi.org/10.1007/s11837-019-03626-1 · OSTI ID:1556924

Harstad, S. M. ^[1]; El-Gendy, A. A. ^[2]; Gupta, S. ^[3]; Pecharsky, V. K. ^[4];

^[1]

Virginia Commonwealth Univ., Richmond, VA (United States)
Virginia Commonwealth Univ., Richmond, VA (United States); Univ. of Texas, El Paso, TX (United States)
Ames Lab., Ames, IA (United States)
Ames Lab. and Iowa State Univ., Ames, IA (United States)

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 (ΔS_M) and/or temperature (ΔT_ad) of a material in response to a change in applied magnetic field. Ball milled materials generally exhibit smaller ΔS_M 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.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1556924

Report Number(s):: IS-J--9989

Journal Information:: JOM. Journal of the Minerals, Metals & Materials Society, Journal Name: JOM. Journal of the Minerals, Metals & Materials Society Journal Issue: 9 Vol. 71; ISSN 1047-4838

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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