Abstract
An experimental study is made of the Mössbauer effect of 57Fe in vanadium and vanadium hydride matrices. We have measured the recoil-free fraction and second-order Doppler shift over the temperature range 100–700°K. The vanadium results are fitted with simple expressions for the mean-square displacement and velocity of the defect at the high temperature range. Both quantities suggest an increase in force constants in the vicinity of the iron defect. The vanadium hydride samples display a higher recoil-free fraction than the vandium samples. This is attributed to hydrogen nucleation around the iron defect.
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