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Magnetocaloric Effect of Polycrystal GdLiF4 for Adiabatic Magnetic Refrigeration
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2006
Year
EngineeringPolymer-based MagnetMagnetic ResonanceMagnetocaloric EffectMagnetic OrderingChemistryEntropy ChangeMagnetic MaterialsAlternative RefrigerantRefrigerationMagnetismChemical EngineeringMagnetic Data StorageAdiabatic Demagnetization RefrigerationMagnetic RefrigerationMaterials ScienceEnergy StorageMagnetic MaterialMagnetic MediumSpintronicsNatural SciencesApplied PhysicsAdiabatic Magnetic RefrigerationFunctional Materials
Polycrystal gadolinium lithium fluorides (GdLiF4=GLF) have been investigated as magnetic materials for an adiabatic demagnetization refrigeration (ADR) system operating at 4 K. Because of difficulties in growing a single crystal of GLF, a polycrystalline sample was fabricated and investigated. The relative density of the fabricated polycrystal was approximately 95%. The measured magnetization data for temperatures above 2 K showed typical paramagnetic behavior. The heat capacity was measured between 0.5 K and 10 K at various magnetic fields. The data suggest that a peak temperature relating to magnetic ordering will be found at a temperature lower than 0.5 K. The calculated entropy data show that the entropy change in GLF at magnetic fields greater than 2 T are 20% to 60% larger than those of a typical magnetic refrigerant GGG. We conclude that GLF will be one of the most suitable magnetic materials for a 4 K ADR.