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Title: Structure-property correlations and scaling in the magnetic and magnetocaloric properties of GdCrO3 particles

Abstract

The structure, magnetic, and magnetocaloric (MC) properties of orthorhombic nanocrystalline GdCrO3 with six particle sizes: < d > = 87, 103, 145, 224, 318, and 352 nm are reported. The particle size was tailored by annealing under different temperatures and estimated by scanning electron microscopy. With increase in < d >, Goldschmidt tolerance factor t, orthorhombic strain s, and out-of-plane Cr–O1–Cr bond angle first decrease, reaching minimum values for < d > = 224 nm, and then increase for sample with < d > = 318 nm and 352 nm, thus showing a V-shaped variation. Temperature dependence of the magnetization (M) reveals an antiferromagnetic transition at $${T}_{\text{N}}^{\text{Cr}}\sim 168$$ K for < d > ≥ 224 nm and $${T}_{\text{N}}^{\text{Cr}}\sim 167$$ K for < d > < 224 nm and an essentially d-independent spin-reorientation at TSR = 9 K. M measured at 5 K and 7 T first increases with increase in < d >, reaching maximum value for sample with < d > = 224 nm, and then decreases for samples with < d > = 318 nm and 352 nm, showing an inverted-V variation with < d >. Similar < d >-dependence is observed for the magnetic entropy change (MEC) and relative cooling power (RCP) showing a close relationship between the structural and magnetic properties of GdCrO3 nanoparticles investigated here. The 224 nm sample with the minimum values of t, s, and Cr–O1–Cr bond angle exhibits the maximum value of MEC (–ΔS) = 37.8 J kg–1 K–1 at 5 K under a field variation (ΔH) of 7 T and its large estimated RCP of 623.6 J Kg–1 is comparable with those of typical MC materials. Both (–ΔS) and RCP are shown to scale with the saturation magnetization MS, suggesting that MS is the crucial factor controlling their magnitudes. Assuming (–ΔS) ~ (ΔH)n, the temperature dependence of n for the six samples are determined, n varying between 1.3 at 5 K to n = 2.2 at 130 K in line with its expected magnitudes based on mean-field theory. Furthermore, these results on structure-property correlations and scaling in GdCrO3 suggest that its MC properties are tunable for potential low-temperature magnetic refrigeration applications.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [2]; ORCiD logo [1]
  1. Univ. of Connecticut, Storrs, CT (United States)
  2. West Virginia Univ., Morgantown, WV (United States)
Publication Date:
Research Org.:
Univ. of Connecticut, Storrs, CT (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
OSTI Identifier:
1838007
Grant/Contract Number:  
FG02-86ER13622
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 33; Journal Issue: 20; Journal ID: ISSN 0953-8984
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Shi, Jianhang, Sauyet, Theodore, Dang, Yanliu, Suib, Steven L., Seehra, Mohindar S., and Jain, Menka. Structure-property correlations and scaling in the magnetic and magnetocaloric properties of GdCrO3 particles. United States: N. p., 2021. Web. doi:10.1088/1361-648x/abf19a.
Shi, Jianhang, Sauyet, Theodore, Dang, Yanliu, Suib, Steven L., Seehra, Mohindar S., & Jain, Menka. Structure-property correlations and scaling in the magnetic and magnetocaloric properties of GdCrO3 particles. United States. https://doi.org/10.1088/1361-648x/abf19a
Shi, Jianhang, Sauyet, Theodore, Dang, Yanliu, Suib, Steven L., Seehra, Mohindar S., and Jain, Menka. Wed . "Structure-property correlations and scaling in the magnetic and magnetocaloric properties of GdCrO3 particles". United States. https://doi.org/10.1088/1361-648x/abf19a. https://www.osti.gov/servlets/purl/1838007.
@article{osti_1838007,
title = {Structure-property correlations and scaling in the magnetic and magnetocaloric properties of GdCrO3 particles},
author = {Shi, Jianhang and Sauyet, Theodore and Dang, Yanliu and Suib, Steven L. and Seehra, Mohindar S. and Jain, Menka},
abstractNote = {The structure, magnetic, and magnetocaloric (MC) properties of orthorhombic nanocrystalline GdCrO3 with six particle sizes: < d > = 87, 103, 145, 224, 318, and 352 nm are reported. The particle size was tailored by annealing under different temperatures and estimated by scanning electron microscopy. With increase in < d >, Goldschmidt tolerance factor t, orthorhombic strain s, and out-of-plane Cr–O1–Cr bond angle first decrease, reaching minimum values for < d > = 224 nm, and then increase for sample with < d > = 318 nm and 352 nm, thus showing a V-shaped variation. Temperature dependence of the magnetization (M) reveals an antiferromagnetic transition at ${T}_{\text{N}}^{\text{Cr}}\sim 168$ K for < d > ≥ 224 nm and ${T}_{\text{N}}^{\text{Cr}}\sim 167$ K for < d > < 224 nm and an essentially d-independent spin-reorientation at TSR = 9 K. M measured at 5 K and 7 T first increases with increase in < d >, reaching maximum value for sample with < d > = 224 nm, and then decreases for samples with < d > = 318 nm and 352 nm, showing an inverted-V variation with < d >. Similar < d >-dependence is observed for the magnetic entropy change (MEC) and relative cooling power (RCP) showing a close relationship between the structural and magnetic properties of GdCrO3 nanoparticles investigated here. The 224 nm sample with the minimum values of t, s, and Cr–O1–Cr bond angle exhibits the maximum value of MEC (–ΔS) = 37.8 J kg–1 K–1 at 5 K under a field variation (ΔH) of 7 T and its large estimated RCP of 623.6 J Kg–1 is comparable with those of typical MC materials. Both (–ΔS) and RCP are shown to scale with the saturation magnetization MS, suggesting that MS is the crucial factor controlling their magnitudes. Assuming (–ΔS) ~ (ΔH)n, the temperature dependence of n for the six samples are determined, n varying between 1.3 at 5 K to n = 2.2 at 130 K in line with its expected magnitudes based on mean-field theory. Furthermore, these results on structure-property correlations and scaling in GdCrO3 suggest that its MC properties are tunable for potential low-temperature magnetic refrigeration applications.},
doi = {10.1088/1361-648x/abf19a},
journal = {Journal of Physics. Condensed Matter},
number = 20,
volume = 33,
place = {United States},
year = {Wed Apr 28 00:00:00 EDT 2021},
month = {Wed Apr 28 00:00:00 EDT 2021}
}

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