Comparison of the dielectric and magnetocaloric properties of bulk and film of GdFe0.5Cr0.5O3
Abstract
Here, we report a comparison of the magnetic, magnetocaloric, and dielectric properties of 50% iron substituted GdCrO3 (GdFe0.5Cr0.5O3) bulk pellet and 960 nm thick film of GdFe0.5Cr0.5O3 (GFCO). The 960 nm film was synthesized on a platinized-silicon substrate by chem. soln. deposition and spin-coating methods. The X-ray diffraction scans of the bulk sample and the film as well as the morphology of the film as examined by the field-emission scanning electron microscope indicate phase-pure and polycrystalline nature of these samples. XPS was used to deermine the valence states of Gd, Fe, and Cr. The temp. dependence of the dielectric const. from 225 to 700 K shows peaks at TC = 525 K for the bulk and ≈450 K for the film due to ferroelectric to paraelectric transitions, since elec. polarization vs elec. field hysteresis loops are observed. at room temp. The dielectric studies in the bulk GFCO for T > TC indicate a relaxor-like behavior. The measurements of the magnetization (M) of the samples as a function of temp. (5-350 K) and magnetic field (H) up to 7 T (=70 kOe) depict hysteresis behavior at low temps. due to the canted antiferromagnetic order of Fe3+/Cr3+ below the Néel temp. ofmore »
- Authors:
-
- Univ. of Connecticut, Storrs, CT (United States)
- 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; USDOE
- OSTI Identifier:
- 1838052
- Alternate Identifier(s):
- OSTI ID: 1798932
- Grant/Contract Number:
- FG02-86ER13622
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 129; Journal Issue: 24; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Thin films; Cooling technology; Cryogenics; Dielectric properties; Multiferroics; Spin coating; Polycrystalline material; Magnetic hysteresis; Scanning electron microscopy
Citation Formats
Shi, Jianhang, Seehra, Mohindar S., Dang, Yanliu, Suib, Steven L., and Jain, Menka. Comparison of the dielectric and magnetocaloric properties of bulk and film of GdFe0.5Cr0.5O3. United States: N. p., 2021.
Web. doi:10.1063/5.0048828.
Shi, Jianhang, Seehra, Mohindar S., Dang, Yanliu, Suib, Steven L., & Jain, Menka. Comparison of the dielectric and magnetocaloric properties of bulk and film of GdFe0.5Cr0.5O3. United States. https://doi.org/10.1063/5.0048828
Shi, Jianhang, Seehra, Mohindar S., Dang, Yanliu, Suib, Steven L., and Jain, Menka. Mon .
"Comparison of the dielectric and magnetocaloric properties of bulk and film of GdFe0.5Cr0.5O3". United States. https://doi.org/10.1063/5.0048828. https://www.osti.gov/servlets/purl/1838052.
@article{osti_1838052,
title = {Comparison of the dielectric and magnetocaloric properties of bulk and film of GdFe0.5Cr0.5O3},
author = {Shi, Jianhang and Seehra, Mohindar S. and Dang, Yanliu and Suib, Steven L. and Jain, Menka},
abstractNote = {Here, we report a comparison of the magnetic, magnetocaloric, and dielectric properties of 50% iron substituted GdCrO3 (GdFe0.5Cr0.5O3) bulk pellet and 960 nm thick film of GdFe0.5Cr0.5O3 (GFCO). The 960 nm film was synthesized on a platinized-silicon substrate by chem. soln. deposition and spin-coating methods. The X-ray diffraction scans of the bulk sample and the film as well as the morphology of the film as examined by the field-emission scanning electron microscope indicate phase-pure and polycrystalline nature of these samples. XPS was used to deermine the valence states of Gd, Fe, and Cr. The temp. dependence of the dielectric const. from 225 to 700 K shows peaks at TC = 525 K for the bulk and ≈450 K for the film due to ferroelectric to paraelectric transitions, since elec. polarization vs elec. field hysteresis loops are observed. at room temp. The dielectric studies in the bulk GFCO for T > TC indicate a relaxor-like behavior. The measurements of the magnetization (M) of the samples as a function of temp. (5-350 K) and magnetic field (H) up to 7 T (=70 kOe) depict hysteresis behavior at low temps. due to the canted antiferromagnetic order of Fe3+/Cr3+ below the Néel temp. of ≈275 K. The M vs H isotherms at various temps. are used to det. and compare the magnetic entropy change (-ΔS) and relative cooling power (RCP) of the two samples, yielding (-ΔS) = 30.7 J/kg K (18.8 J/kg K) and RCP = 566.5 J/kg (375 J/kg) for the bulk (960 nm film) samples of GFCO at 7 K and 7 T, resp. The plot of RCP vs T shows that magnetic cooling for this system is most effective for T < 30 K. Comparatively smaller magnitudes of (-ΔS) and RCP for the film vis-a-vis the bulk sample of GFCO scale with its reduced magnetization. This suggests that further improvements in the quality of the films are needed to improve their magnetization and hence their magnetocaloric properties, possibly making them useful for on-chip cooling in miniaturized devices.},
doi = {10.1063/5.0048828},
journal = {Journal of Applied Physics},
number = 24,
volume = 129,
place = {United States},
year = {Mon Jun 28 00:00:00 EDT 2021},
month = {Mon Jun 28 00:00:00 EDT 2021}
}
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