• K Kishan Rao

      Articles written in Bulletin of Materials Science

    • Microhardness and interatomic binding in some cubic crystals

      K Kishan Rao D B Sirdeshmukh

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      Vicker’s microhardness measurements have been carried out on single crystals of CaF2, SrF2, BaF2, CdF2, PbF2, EuF2, ThO2, NaClO3, NaBrO3, Bi4 (GeO4)3, Bi4(SiO4)3, Bi12GeO20 and Bi12SiO20. The hardness values are discussedvis-a-vis the interatomic binding in these crystals. While most of the fluorite-type crystals are highly ionic, covalency is indicated in the bismuth compounds studied.

    • Growth and characterisation of triammonium citrate

      M Venkateshwarlu T Bhaskar Rao K Kishan Rao

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      Single crystals of triammonium citrate are grown from aqueous solution and characterized using X-ray and etching studies. Using single crystal X-ray diffraction, the crystal is found to be orthorhombic with lattice parametersa = 6·223 Å,b = 15·048 Å andc = 11·056 Å. Surface studies on the as-grown faces reveal stratigraphic patterns. Of the several etchants tried, glacial acetic acid appears to be the best etchant for revealing dislocation sites on the as-grown faces.

    • Growth and habit modification of sodium chlorate crystals

      V Surender K Kishan Rao

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      Single crystals of sodium chlorate were grown in the presence of selective impurities. The morphology of these crystals changed completely from cubic to tetrahedral form. Experiments were performed in the presence of different concentrations of impurities to ascertain their role in modifying the habit of these crystals. The presence of impurity in the solution was found to affect the habit of the crystals, although it does not appear to enter into the lattice.

    • Microhardness studies on some alum crystals

      G Sangaiah K Kishan Rao

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      Microhardness studies were carried out using four alums. The hardness of these crystals was found to be more than alkali halides but was comparable with alkaline earth nitrates. The load variation of hardness has been discussed. Hardness results on these alums have been analysed taking into account the structure. It was observed that hardness varied witha−4, wherea is the lattice constant. Preliminary results on dislocation etching are reported.

    • Growth mechanism of NaBrO3 crystals from aqueous solutions

      V Surender K Kishan Rao

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      To study the growth mechanism of {111} faces of NaBrO3, crystals were grown at different supersaturations ranging from 2% to 8%. The growth mechanisms were investigated based on the growth rate versus supersaturation relation and from the surface features observed on {111} faces. The growth mechanism of these crystals appear to be due to 2D nucleation. The growth rate curve has been further investigated using Ohara and Reid equations. Polynucleation model in two-dimensional nucleation growth theory is suggested as the most possible growth mechanism for these crystals in the present supersaturation range.

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