Parametrization Of Ferromagnetic Phase Transition In Fe

The paper looks about phase transition and the thermodynamic property of Iron.ThernThermodynamic functions are studied and parametrized.These parameters,which controlrnthe phases,one can often make the jumps arbitrarily small and thus produce continuousrnphase transitions.this kind of phase transitions are abrupt changes in the equilibriumrnbehavior of the materials because the materials can be considered to be made up of anrne ectively in nite number of particles.rnThe property of ferromagnetic substance is that the atomic magnets tend to be broughtrninto parallel orientation not only by an applied magnetic eld but also by an inner eld.Therninner eld is due to electrostatic interactions,which are related to the orientation of thernmagnetic moments of electrons through the Pauli principle because of that the spinsrngenerate magnetic elds.rnThe spin Hamiltonian for iron has been derived from electronic structure calculations usingrnIsing model.The Coupling interactions Jij depend on the surrounding magnetic order.Thernexchange interactions are expected in general to tend to cause the atomic moments onrnadjacent atoms to align themselves in the antiparallel orientation.If these interactions arernless important than the interactions that stabilize the parallel orientation of the atomicrnmoments,the substance will be ferromagnetic at low temperature

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