NDLI: Thermodynamics of energy conversion <i>via</i> first order phase transformation in low hysteresis magnetic materials

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Energy & Environmental Science Vol - 6 Issue - 3

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Thermodynamics of energy conversion via first order phase transformation in low hysteresis magnetic materials

Content Provider	Royal Society of Chemistry (RSC)
Author	Song, Yintao Srivastava, Vijay Leighton, C. Bhatti, Kanwal Preet James, Richard D.
Copyright Year	2013
Abstract	We investigate the thermodynamics of first order non-ferromagnetic to ferromagnetic phase transformation in low thermal hysteresis alloys with compositions near Ni44Co6Mn40Sn10 as a basis for the study of multiferroic energy conversion. We develop a Gibbs free energy function based on magnetic and calorimetric measurements that accounts for the magnetic behavior and martensitic phase transformation. The model predicts temperature and field induced phase transformations in agreement with experiments. The model is used to analyze a newly discovered method for the direct conversion of heat to electricity [Srivastava et al., Adv. Energy Mater., 2011, 1, 97], which is suited for the small temperature difference regime, about 10–100 K. Using the model, we explore the efficiency of energy conversion thermodynamic cycles based on this method. We also explore the implications of these predictions for future alloy development. Finally, we relate our simple free energy to more sophisticated theories that account for magnetic domains, demagnetization effects, the crystallography of martensitic phase transformations and twinning.
Starting Page	1315
Ending Page	1327
Page Count	13
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	6
Issue Number	4
Journal	Energy & Environmental Science
DOI	10.1039/c3ee24021e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Gibbs Ferromagnetism Hysteresis Gibbs free energy Martensite Thermodynamic free energy Crystallography
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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