Abstract
The growth of tin, SnI 2 and SnI 4 single crystals in silica gels under the influence of an externally applied uniform electric field is described. A controlled reaction between stannous chloride and KI by a diffusion process in the gel medium was employed. Three different phases, transparent white crystals of tin up to 8 mm in size, yellowish long needles of SnI 2 up to 13 mm in size and reddish octahedral SnI 4 crystals up to 5 mm in size, were grown at room temperature in same experimental set-up. The habit changes resulting from the different growth parameters and the variations in the electrical conductivities of SnI 2 and SnI 4 are also reported. Two distinct electrical conductivity processes were observed and are interpreted as extrinsic and intrinsic conductivities. Magnetic susceptibility measurements reveal the diamagnetic characteristics of these materials and the implications are discussed.
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