• N M Batra

      Articles written in Bulletin of Materials Science

    • Kinetics of calcium molybdate crystallization

      N M Batra S K Arora

      More Details Abstract Fulltext PDF

      Kinetics of crystallization of calcium molybdate from unstirred molten solutions of lithium chloride of low to medium supersaturation in platinum crucibles by the process of continuous cooling at 5° C hr−1 from temperaturesT0=700 and 750°C are investigated. The crystal size measured by optical microscopy for different crystallization periods reveals that both crystal length and width generally increase with cooling period. The degree of crystallizationαt,also increases with cooling period, attaining a maximum of 0·90. The diffusion rate constants,KDlat 700 and 750°C are 0·0776 and 0·1138 respectively. The effect of variation of the crystallization temperature on the crystal size and their number is also studied.

    • Electrical properties of zirconium diselenide single crystals grown by iodine transport method

      S G Patel M K Agarwal N M Batra D Lakshminarayana

      More Details Abstract Fulltext PDF

      Single crystals of zirconium diselenide (ZrSe2) were grown by chemical vapour transport method using iodine as the transporting agent. The crystals were found to exhibit metallic behaviour in the temperature range 77–300 K and semiconducting nature in 300–443 K range. The measurements of thermoelectric power and conductivity enabled the determination of both carrier mobility and carrier concentration. The variation of carrier mobility and carrier concentration with temperature indicates the presence of deep trapping centres and their reduction with temperature in these crystals.

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