A model is proposed to explain the observed decrease of average grain size with an increase of Fe concentration in the Pb1xFexS(0.25x0.75) and Co concentration in the Pb1xCoxS(0.15x0.35) nanoparticle films. Higher solubility product for MS (M=Fe and Co) as compared to PbS is observed to be responsible for the decrease of grain size with an increase of M concentration in the films. The model was found true for Pb1xCdxS(0.45x0.85) and Pb1xMnxS(0.03x0.37) films.

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