Analysis of terbium thermodynamic characteristics for magnetic heat pump applications

Journal Article · Sun Nov 01 04:00:00 EST 1992 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.352267· OSTI ID:7229288

Chen, G L; Mei, V C; Chen, F C ^[1]

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1. Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6180 (United States)

Based on molecular field theory, including the effect of the field-dependent nature of Neel temperature, the entropy, and the magnetocaloric effect in terbium (Tb) have been calculated with the external field between 0 and 7 T (Tesla). The calculated results are compared with the existing experimental measurements. The maximum magnetocaloric temperature change ({Delta}{ital T}) is approximately 14 K near the zero-field Neel temperature (230 K) for an external field at 7 T field. This relatively large magnetocaloric effect indicates that Tb could be an attractive candidate for magnetic heat pump application. The results are then used to study the performance of heat pumps for the Carnot cycle, the constant field cycle, and the ideal regenerative cycle. The performances of these three cycles are discussed and compared.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 7229288
• Journal Information: Journal of Applied Physics; (United States), Journal Name: Journal of Applied Physics; (United States) Vol. 72:9; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
661210 -- Cryogenics-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARNOT CYCLE
COOLING
CRYOGENICS
ELEMENTS
ENTROPY
MAGNETIC FIELDS
METALS
NEEL TEMPERATURE
PHYSICAL PROPERTIES
RARE EARTHS
TERBIUM
THERMODYNAMIC CYCLES
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE