Susceptibility calculations on spin-doped crystals

The susceptibilities of some transition elements, Fe3+ and Gd3+, in various crystals are calculated using the known crystal field parameters. These parameters are used in crystal field theory with the correlation of effective spin Hamiltonian. Two different methods, the density matrix formalism and van Vleck's momentum expansion, are utilized to calculate the susceptibilities. It is possible to see the effect of host crystals, and the temperature dependence of susceptibilities of such salts. (author)