Large magnetocaloric effect in free-standing Gd2O3 nanostructures near liquid helium boiling point
Magnetic and magnetocaloric properties of free-standing gadolinium oxide (Gd _2 O _3 ) nanostructures have been studied. Nanoparticles of Gd _2 O _3 (Gd _2 O _3 -NP), nanorods of Gd _2 O _3 (Gd _2 O _3 -NR) and a mixed system of Gd _2 O _3 nanosheets and nanorods (Gd _2 O _3 -NS+NR) have been prepar...
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IOP Publishing
2025-01-01
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| Online Access: | https://doi.org/10.1088/2053-1591/ada1a5 |
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| author | S Hazarika D Mohanta A V Morozkin R Nirmala |
| author_facet | S Hazarika D Mohanta A V Morozkin R Nirmala |
| author_sort | S Hazarika |
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| description | Magnetic and magnetocaloric properties of free-standing gadolinium oxide (Gd _2 O _3 ) nanostructures have been studied. Nanoparticles of Gd _2 O _3 (Gd _2 O _3 -NP), nanorods of Gd _2 O _3 (Gd _2 O _3 -NR) and a mixed system of Gd _2 O _3 nanosheets and nanorods (Gd _2 O _3 -NS+NR) have been prepared by template-free methods without the use of any surfactant or a catalyst. These samples crystallize in cubic crystal structure (space group Ia- 3, no. 206, cI 80). Magnetization data indicate typical paramagnetic behavior in the temperature range of 300 K to 5 K for all the samples. All three Gd _2 O _3 nanostructures display large magnetocaloric effect at temperatures below ∼10 K. While the maximum isothermal magnetic entropy change (ΔS _m ) value at 6 K is about −22.6 Jkg ^−1 K ^−1 for the Gd _2 O _3 nanorods and −17.8 Jkg ^−1 K ^−1 for Gd _2 O _3 nanoparticles for a magnetic field change of 70 kOe, the mixed Gd _2 O _3 nanosheets and nanorods system prepared by wet chemical method shows a maximum ΔS _m value of −23.6 Jkg ^−1 K ^−1 for the same field change. These are about 41% to 89% more than that of bulk Gd _2 O _3 . Therefore, Gd _2 O _3 -based nanostructures could be very useful for low temperature magnetic refrigeration applications. |
| format | Article |
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| institution | Kabale University |
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| publishDate | 2025-01-01 |
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| spelling | doaj-art-7c540dc8fb4c43e1ab35dfd8855f555e2025-01-08T15:36:46ZengIOP PublishingMaterials Research Express2053-15912025-01-0112101610110.1088/2053-1591/ada1a5Large magnetocaloric effect in free-standing Gd2O3 nanostructures near liquid helium boiling pointS Hazarika0D Mohanta1https://orcid.org/0000-0002-1750-7620A V Morozkin2R Nirmala3https://orcid.org/0000-0001-6292-8769Department of Physics, Indian Institute of Technology Madras , Chennai 600 036, IndiaDepartment of Physics, Tezpur University , Napaam, Tezpur 784 028, Assam, IndiaDepartment of Chemistry, Moscow Lomonosov State University , Moscow, 119992, RussiaDepartment of Physics, Indian Institute of Technology Madras , Chennai 600 036, IndiaMagnetic and magnetocaloric properties of free-standing gadolinium oxide (Gd _2 O _3 ) nanostructures have been studied. Nanoparticles of Gd _2 O _3 (Gd _2 O _3 -NP), nanorods of Gd _2 O _3 (Gd _2 O _3 -NR) and a mixed system of Gd _2 O _3 nanosheets and nanorods (Gd _2 O _3 -NS+NR) have been prepared by template-free methods without the use of any surfactant or a catalyst. These samples crystallize in cubic crystal structure (space group Ia- 3, no. 206, cI 80). Magnetization data indicate typical paramagnetic behavior in the temperature range of 300 K to 5 K for all the samples. All three Gd _2 O _3 nanostructures display large magnetocaloric effect at temperatures below ∼10 K. While the maximum isothermal magnetic entropy change (ΔS _m ) value at 6 K is about −22.6 Jkg ^−1 K ^−1 for the Gd _2 O _3 nanorods and −17.8 Jkg ^−1 K ^−1 for Gd _2 O _3 nanoparticles for a magnetic field change of 70 kOe, the mixed Gd _2 O _3 nanosheets and nanorods system prepared by wet chemical method shows a maximum ΔS _m value of −23.6 Jkg ^−1 K ^−1 for the same field change. These are about 41% to 89% more than that of bulk Gd _2 O _3 . Therefore, Gd _2 O _3 -based nanostructures could be very useful for low temperature magnetic refrigeration applications.https://doi.org/10.1088/2053-1591/ada1a5magnetocaloric effectmagnetic propertiesrare earth oxide nanostructures |
| spellingShingle | S Hazarika D Mohanta A V Morozkin R Nirmala Large magnetocaloric effect in free-standing Gd2O3 nanostructures near liquid helium boiling point Materials Research Express magnetocaloric effect magnetic properties rare earth oxide nanostructures |
| title | Large magnetocaloric effect in free-standing Gd2O3 nanostructures near liquid helium boiling point |
| title_full | Large magnetocaloric effect in free-standing Gd2O3 nanostructures near liquid helium boiling point |
| title_fullStr | Large magnetocaloric effect in free-standing Gd2O3 nanostructures near liquid helium boiling point |
| title_full_unstemmed | Large magnetocaloric effect in free-standing Gd2O3 nanostructures near liquid helium boiling point |
| title_short | Large magnetocaloric effect in free-standing Gd2O3 nanostructures near liquid helium boiling point |
| title_sort | large magnetocaloric effect in free standing gd2o3 nanostructures near liquid helium boiling point |
| topic | magnetocaloric effect magnetic properties rare earth oxide nanostructures |
| url | https://doi.org/10.1088/2053-1591/ada1a5 |
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