Mossbauer and XRD studies on the effect of doping iron in KCaY(PO4)2

摘要

The effect of doping iron at the yttrium site inhexagonal KCaY(PO4)2 is studied for various concentrations of x(0≤x≤1), of iron using Mossbauer and X-raydiffraction methods. For low iron concentrations,very little changes in structure are seen but at X≈0.1, onset of new peaks in the XRD pattern isobserved. The Mossbauer study of the doped samplesreveals that iron has a solubility of up to 2.5% inthe parent phase with any excess iron precipitatingout to form a new and unknown phase. From a detailedanalysis of the X-ray diffraction pattern(corresponding to x=1) of the latter phase, it isfound that this phase is rhombohedral with the possible space group R3.