Title:
USE OF RARE EARTH FLUORIDE SINGLE CRYSTAL IN MAGNETIC REFRIGERATION
Document Type and Number:
WIPO Patent Application WO/2023/207400
Kind Code:
A1
Abstract:
The present invention relates to the field of magnetic functional materials. Disclosed are a use of a rare earth fluoride single crystal in magnetic refrigeration, a magnetic refrigeration method, and a magnetic refrigeration apparatus. A magnetocaloric material of the series is a lithium rare earth fluoride, and the chemical formula is LiREF4, wherein RE is one or more of rare earth elements gadolinium, terbium, dysprosium, holmium, erbium, thulium, and ytterbium. A magnetocaloric material single crystal of the series has extremely strong magnetic anisotropy. By applying a variable magnetic field of 0-20 kOe in the direction of an easy magnetization axis of the magnetocaloric material, LiGdF4, LiTbF4, LiHoF4, LiDyF4, LiErF4, LiYbF4, and LiTmF4 respectively obtain 50.35 J·kg-1·K-1, 21.12 J·kg-1·K-1, 24.98 J·kg-1·K-1, 24.45 J·kg-1·K-1, 21.95 J·kg-1·K-1, 14.7 J·kg-1·K-1, and 0.692 J·kg-1·K-1 isothermal magnetic entropy changes at 1.8 K, 4 K, 4 K, 1.8 K, 1.8 K, 1.8 K, and 18 K. The thermal conductivity of LiTbF4 and LiErF4 at 25 K reaches 50 W·K-1·m-1.
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Inventors:
LI BING (CN)
YUAN DONGSHENG (JP)
LIU PENG (CN)
GARCIA VILLORA ENCARNACION ANTONIA (JP)
ZHANG ZHIDONG (CN)
SHIMAMURA KIYOSHI (JP)
YUAN DONGSHENG (JP)
LIU PENG (CN)
GARCIA VILLORA ENCARNACION ANTONIA (JP)
ZHANG ZHIDONG (CN)
SHIMAMURA KIYOSHI (JP)
Application Number:
PCT/CN2023/081822
Publication Date:
November 02, 2023
Filing Date:
March 16, 2023
Export Citation:
Assignee:
INST METAL RESEARCH CAS (CN)
NAT INST MATERIALS SCIENCE (JP)
NAT INST MATERIALS SCIENCE (JP)
International Classes:
F25B21/00; C01F17/36
Foreign References:
| CN114804184A | 2022-07-29 | |||
| CN113035480A | 2021-06-25 | |||
| CN106190052A | 2016-12-07 | |||
| CN111292909A | 2020-06-16 | |||
| US20080216484A1 | 2008-09-11 |
Other References:
MENNENGA, G. ; DE JONGH, L.J. ; HUISKAMP, W.J. ; LAURSEN, I.: "A comparative study of the magnetic ordering specific heats of four S = 12 dipolar magnets: LiRF"4 (R = Er, Dy, Ho, Tb)", JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, ELSEVIER, AMSTERDAM, NL, vol. 44, no. 1-2, 1 September 1984 (1984-09-01), AMSTERDAM, NL , pages 48 - 58, XP024443016, ISSN: 0304-8853, DOI: 10.1016/0304-8853(84)90046-5
Attorney, Agent or Firm:
SHENYANG CHENCHUANG TECHNICAL PATENT AGENT LTD (CN)
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