Parametrization of Ferromagnetic Phase Transition in FE
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Date
2013-06
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Addis Ababa University
Abstract
The paper looks about phase transition and the thermodynamic property of Iron.The
Thermodynamic functions are studied and parametrized.These parameters,which control
the phases,one can often make the jumps arbitrarily small and thus produce continuous
phase transitions.this kind of phase transitions are abrupt changes in the equilibrium
behavior of the materials because the materials can be considered to be made up of an
e ectively in nite number of particles.
The property of ferromagnetic substance is that the atomic magnets tend to be brought
into parallel orientation not only by an applied magnetic eld but also by an inner eld.The
inner eld is due to electrostatic interactions,which are related to the orientation of the
magnetic moments of electrons through the Pauli principle because of that the spins
generate magnetic elds.
The spin Hamiltonian for iron has been derived from electronic structure calculations using
Ising model.The Coupling interactions Jij depend on the surrounding magnetic order.The
exchange interactions are expected in general to tend to cause the atomic moments on
adjacent atoms to align themselves in the antiparallel orientation.If these interactions are
less important than the interactions that stabilize the parallel orientation of the atomic
moments,the substance will be ferromagnetic at low temperature
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Ferromagnetic Phase Transition in FE