DETERMINATION OF THE Mn2+-F- BOND LENGTH USING A COMPLETE SPECTRUM CRITERION AND A NEXT NEAREST NEIGHBOR MODEL

A complete spectrum criterion and a next nearest neighbor model are proposed. Research indicates: 1) Using this criterion can remove the long existing puzzle that different parameters produce different bond lengths. The criterion greatly improve the reliability of optical method for determining the Mn²⁺-F^- distance R. 2) The exponent n and coefficient K in the inverse power law 10Dq=KR^-n are obviously affected by next nearest neighbor. 3) Considering the effect can lead to a better result, the next nearest neighbor model is thus more strict and reliable.