Temperature variation of the zero-field splitting in CdCl2 : Mn2+

The expressions derived previously for the zero-field splitting in trigonal symmetry have been used here to study the temperature dependence of the splitting in CdCl2 : Mn2+ in the temperature range 20-710 degrees K. It has been assumed that a strictly external point-charge point-multipole model is valid. If one considers, because of the lack of available data on the temperature variation of the lattice parameters, that the c dimension of the hexagonal unit cell of the crystal increases linearly with temperature, it is possible to explain the splitting at temperatures below 300 degrees K. To interpret the splitting in the entire range of temperature meaningfully, the structure parameters at these temperatures must be known rather accurately.