• K Satyanarayana

      Articles written in Pramana – Journal of Physics

    • Lattice thermal expansion of silver indium disulphide

      P Kistaiah K Satyanarayana Murthy K V Krishna Rao

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      Lattice parameters of chalcopyrite type compound silver indium disulphide (AgInS2) were determined as a function of temperature by the x-ray method in the temperature range 28 to 685°C. Using these data, the coefficients of thermal expansion,a anda, were evaluated by a graphical method. The temperature dependence ofa anda is represented by a suitable equation. The anisotropic thermal expansion of AgInS2 is explained in terms of the thermal expansion of the Ag-S and In-S bonds of the AgInS2 lattice.

    • Effect of radio frequency field on toroidal plasma parameters

      D Bora K Satyanarayana V N Rai

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      Low temperature plasma parameters in a toroidal magnetic field are measured. The effect of an externally applied perpendicular electric field on the plasma parameters is studied. The lifetime of the plasma is measured in the presence and absence of the RF electric field. Decrease in the plasma lifetime in the presence of RF field is attributed to detrapping of the primary electrons to a larger volume. Plasma lifetime increases when a small vertical magnetic field is added to the toroidal magnetic field.

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