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Bethe–Slater curve : ウィキペディア英語版
Bethe–Slater curve

Bethe–Slater curve is a graphical representation of exchange energy for transition metals as a function of the ratio of the interatomic distance ''a'' to the radius ''r'' of the ''3d'' electron shell.〔http://www.nitt.edu/home/academics/departments/physics/faculty/lecturers/justin/students/magnetic/exchange/〕
The curve illustrates why certain metals are ferromagnetic and other antiferromagnetic.
For a pair of atoms, the exchange interaction ''wij'' (responsible for the energy ''E'') is calculated as:〔Soshin Chikazumi, Physics of Ferromagnetism, Oxford University Press, New York, 1997, p. 125, ISBN 0-19-851776-9〕
w_= - 2 \cdot J \cdot S_i \cdot S_j
where: ''J'' = exchange integral; ''S'' = electron spins; ''i'' and ''j'' = indices of the two atoms.
== References ==


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