Temperature-dependent Mn2+-6S state splitting in scheelites

Measurements of the EPR spectrum of seven scheelite structure crystals doped with Mn2+ ions are performed in the temperature range from 4.2 to 350 K. Experimental data of a preceding paper are completed. The temperature dependent zero field splitting is discussed in terms of implicit and explicit contributions. Being the most important one the temperature effect of b20 is described with an Einstein model where the impurity force constant is related to regular cationic vibrations by a Born-Mayer potential. (author)