Magnetocaloric Effect of Micro- and Nanoparticles of Gd5Si4

doi:10.1007/s11837-019-03626-1

This content will become publicly available on July 2, 2020

Title: Magnetocaloric Effect of Micro- and Nanoparticles of Gd ₅Si ₄

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 (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 Gd ₅Si ₄ 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, Gd ₅Si ₄, 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 Gd ₅Si ₄ was first milled with poly(ethylene glycol) followed by milling in heptane was used to produce fine particles of Gd ₅Si ₄ 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 Gd ₅Si ₄, the maximummore »« less

Authors:

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)

Publication Date:: 2019-07-02

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

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 Name: JOM. Journal of the Minerals, Metals & Materials Society; 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.

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                    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.

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                    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.

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@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       = ,

  volume       = ,

  place        = {United States},

  year         = {2019},

  month        = {7}

}

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Works referenced in this record:

Growth and characterization of Pt-protected Gd₅Si₄ thin films
journal, May 2014

Hadimani, R. L.; Mudryk, Y.; Prost, T. E.
Journal of Applied Physics, Vol. 115, Issue 17, Article No. 17C113
DOI: 10.1063/1.4865322

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Similar Records

This content will become publicly available on July 2, 2020

Title: Magnetocaloric Effect of Micro- and Nanoparticles of Gd 5Si 4

Abstract

Citation Formats

Growth and characterization of Pt-protected Gd5Si4 thin films journal, May 2014

Title: Magnetocaloric Effect of Micro- and Nanoparticles of Gd ₅Si ₄

Growth and characterization of Pt-protected Gd₅Si₄ thin films
journal, May 2014