On the Paramagnetic Susceptibility of Fe(HCOO)<SUB>2</SUB>·2H<SUB>2</SUB>O

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  • On the Paramagnetic Susceptibility of Fe(HCOO)2・2H2O
  • On the Paramagnetic Susceptibility of F

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The powder paramagnetic susceptibility of Fe(HCOO)2·2H2O is analyzed on the basis of a two-kind-spin model, i.e. the Ising spin of one-half and the Heisenberg spin of two with the use of the values of parameters, such as the exchange constants and the anisotropy constants, obtained previously. The susceptibility due to the Ising spin is taken into consideration using the high-temperature series expansion result. On the other hand, the susceptibility due to the Heisenberg spin is calculated exactly. The interaction between two kinds of spins is taken into account by using the molecular field approximation. It is shown that the calculated result agrees well with the experimental data and the estimated exchange constants are found to be reasonable compared with those in other formates.

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