Cyclic structural ordering induced by high energy ball milling in a Fe2.1Cr0.9Al magnetocaloric alloy

Vinay Sharma; Shashwat Shukla; Xi Shibo; R. V. Ramanujan

doi:10.1016/j.jmmm.2018.09.082

Cyclic structural ordering induced by high energy ball milling in a Fe_2.1Cr_0.9Al magnetocaloric alloy

Vinay Sharma, Shashwat Shukla, Xi Shibo, R. V. Ramanujan^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

Current research on magnetocaloric materials (MCM) aims at developing low cost, environmentally friendly materials which can be manufactured by simple processes. We report the effect of high energy ball milling on the structural, magnetic and magnetocaloric properties of low cost Fe_2.1Cr_0.9Al alloys. The degree of structural order in the Fe-Cr sublattice was found to vary with milling time in a cyclic fashion at a milling speed of 600 rpm. This phenomenon was analyzed by a reaction rate model based on the stored energy during high energy milling. The sample possessed a B2 crystal structure before milling. Milling for 15 min. at 600 rpm induced structural changes to produce a L2₁ structure. Interestingly, the 15 min. milled sample exhibited ∼50% higher saturation magnetization (M_S) compared to the value before milling. The relative cooling power (RCP) also increased to 300 Jkg⁻¹ at 5 T, compared to a value of 244 Jkg⁻¹ before milling. Extended X-ray absorption fine structure (EXAFS) studies revealed the emergence of short range order in the milled samples.

Original language	English
Pages (from-to)	528-536
Number of pages	9
Journal	Journal of Magnetism and Magnetic Materials
Volume	474
DOIs	https://doi.org/10.1016/j.jmmm.2018.09.082
Publication status	Published - Mar 15 2019
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2018 Elsevier B.V.

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1016/j.jmmm.2018.09.082

Cite this

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title = "Cyclic structural ordering induced by high energy ball milling in a Fe2.1Cr0.9Al magnetocaloric alloy",

abstract = "Current research on magnetocaloric materials (MCM) aims at developing low cost, environmentally friendly materials which can be manufactured by simple processes. We report the effect of high energy ball milling on the structural, magnetic and magnetocaloric properties of low cost Fe2.1Cr0.9Al alloys. The degree of structural order in the Fe-Cr sublattice was found to vary with milling time in a cyclic fashion at a milling speed of 600 rpm. This phenomenon was analyzed by a reaction rate model based on the stored energy during high energy milling. The sample possessed a B2 crystal structure before milling. Milling for 15 min. at 600 rpm induced structural changes to produce a L21 structure. Interestingly, the 15 min. milled sample exhibited ∼50% higher saturation magnetization (MS) compared to the value before milling. The relative cooling power (RCP) also increased to 300 Jkg−1 at 5 T, compared to a value of 244 Jkg−1 before milling. Extended X-ray absorption fine structure (EXAFS) studies revealed the emergence of short range order in the milled samples.",

author = "Vinay Sharma and Shashwat Shukla and Xi Shibo and Ramanujan, {R. V.}",

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doi = "10.1016/j.jmmm.2018.09.082",

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AU - Sharma, Vinay

AU - Shukla, Shashwat

AU - Shibo, Xi

AU - Ramanujan, R. V.

PY - 2019/3/15

Y1 - 2019/3/15

N2 - Current research on magnetocaloric materials (MCM) aims at developing low cost, environmentally friendly materials which can be manufactured by simple processes. We report the effect of high energy ball milling on the structural, magnetic and magnetocaloric properties of low cost Fe2.1Cr0.9Al alloys. The degree of structural order in the Fe-Cr sublattice was found to vary with milling time in a cyclic fashion at a milling speed of 600 rpm. This phenomenon was analyzed by a reaction rate model based on the stored energy during high energy milling. The sample possessed a B2 crystal structure before milling. Milling for 15 min. at 600 rpm induced structural changes to produce a L21 structure. Interestingly, the 15 min. milled sample exhibited ∼50% higher saturation magnetization (MS) compared to the value before milling. The relative cooling power (RCP) also increased to 300 Jkg−1 at 5 T, compared to a value of 244 Jkg−1 before milling. Extended X-ray absorption fine structure (EXAFS) studies revealed the emergence of short range order in the milled samples.

AB - Current research on magnetocaloric materials (MCM) aims at developing low cost, environmentally friendly materials which can be manufactured by simple processes. We report the effect of high energy ball milling on the structural, magnetic and magnetocaloric properties of low cost Fe2.1Cr0.9Al alloys. The degree of structural order in the Fe-Cr sublattice was found to vary with milling time in a cyclic fashion at a milling speed of 600 rpm. This phenomenon was analyzed by a reaction rate model based on the stored energy during high energy milling. The sample possessed a B2 crystal structure before milling. Milling for 15 min. at 600 rpm induced structural changes to produce a L21 structure. Interestingly, the 15 min. milled sample exhibited ∼50% higher saturation magnetization (MS) compared to the value before milling. The relative cooling power (RCP) also increased to 300 Jkg−1 at 5 T, compared to a value of 244 Jkg−1 before milling. Extended X-ray absorption fine structure (EXAFS) studies revealed the emergence of short range order in the milled samples.

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