• B T Deshmukh

      Articles written in Bulletin of Materials Science

    • Microstructures, thermal diffusion and decomposition studies in the two phase solution grown mixed crystals of NaCl and KCl

      S R Ghadekar B T Deshmukh

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      Mixed NaCl-KCl crystals are grown from water solution. Thermal diffusion, decomposition and microstructures studies by employing the etching technique are reported. It is shown that microstructures consisting of alternate lamellae of NaCl and KCl arranged in 〈100〉 and 〈110〉 directions in the two-phase mixed NaCl-KCl crystals observed at room temperature get converted to the one consisting of random mixture of both the phases on finer scale on heating at 300°C for 30 hr. The dissociated matrix on heating at 600°C for 15 hr regains almost all the characteristics of a single crystal transforming the material into single-phase mixed (NaK) Cl crystals. The temperature dependence of the thermal diffusion is discussed.

    • Thermoluminescence of alkali halides doped with alkaline earth impurities

      B T Deshmukh S V Moharil

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      Doping with alkaline earth impurities converts the alkali halides into very efficient phosphors. LiF doped with Mg is extensively used in radiation dosimetry. However, the phenomenon of thermoluminescence in these materials is far from clear. LiF-tld 100 is artificially separated from the rest of the alkali halide phosphors. The available experimental data are not fully utilised in building a model for thermoluminescence processes. In this review, thermoluminescence properties of LiF-tld 100 and other alkali halide phosphors are discussed. The comparative study which points out several common points could be useful in understanding thetl processes in these phosphors.

    • Dislocation density in electrolytically-coloured KCl crystals

      N L Bhole B T Deshmukh

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      Dislocation densities have been investigated in potassium chloride crystals, electrolytically coloured in the temperature range of 550–710°C. The results show an increase in the dislocation density with coloration temperature upto 650°C and decrease thereafter. This is attributed to the movement of dislocations and interactions between them during electrolytic coloration of the crystals.

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