Magnetocaloric effect in strong magnetic fields

作者: A.M. Tishin

DOI: 10.1016/0011-2275(90)90258-E

关键词: Debye modelLandé g-factorMagnetic refrigerationQuantum numberMaterials scienceRefrigerationFerromagnetismAtmospheric temperature rangeMagnetic fieldCondensed matter physics

摘要: Abstract Calculations of magnetic entropy change, ΔSM, and magnetocaloric effect, ΔT, in 3d 4f magnetics have been carried out, based on the molecular field theory. ΔSM ΔT studied as a function Debye temperature, θD, Lande factor, gj, quantum number total mechanical momentum, J, also phase transition temperatures. Limiting values determined extremely strong fields. The results obtained are compared with experimental data. It is shown that use ferromagnetic alloys Tbx Gd1-x operating devices refrigerating machines room temperature range more efficient than pure Gd. These found to high specific refrigerant capacity over wide fields from 0.1 6 T, which enables one develop highly economic refrigeration weak applied.

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