THE EXPLORATION OF HABIT CHANGE OF ^(57)Fe^(3+):KDP BASED ON MöSSBAUER STUDIES

The Mössbauer study on mechanism of habit change has been made on KH_(2)PO_(4)(KDP)crystals grown in the presence of ^(57)Fe^(3+) iron impurities.Mössbauer spectra of the ^(57)Fe^(3+) :KDP exhibit a typical quadrupole split Fe^(3+) pattern at room temperature.The quadrupole splittingΔE(Q)=0.5lmm/s,and the isomer shift IS=0.40mm/s are obtained from computer fitting.Based on experimental results and theoretical calculation,the Fe^(3+) can occupy the interstitial positions in the lattice.