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Magnetic entropy change from first principles and magneto-thermodynamic models.

Author(s) : PAUDYAL D., PECHARSKY V. K., GSCHNEIDNER K. A. Jr

Summary

Established first principles calculations describe ground state properties. The magnetic entropy change, which is a finite temperature property, cannot be directly calculated from this approach. The theoretical estimates of the magnetic entropy change, so far are from phenomenological models. In order to make theoretical predictions more reliable and free from adjustable parameters the authors propose a pathway for estimating the magnetic entropy change by coupling first principles outputs with established magneto-thermodynamic models. Here, they discuss this pathway for first order materials using Gd(5)Si(2)Ge(2) and apply it to Tb(5)Si(2.2)Ge(1.8). The estimated magnetostructural transition temperature and magnetic entropy change are in good agreement with experimental results.

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Pages: 2009-3

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Details

  • Original title: Magnetic entropy change from first principles and magneto-thermodynamic models.
  • Record ID : 2009-1583
  • Languages: English
  • Source: 3rd International Conference on Magnetic Refrigeration at Room Temperature
  • Publication date: 2009/05/11

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