• R A Tewari

      Articles written in Bulletin of Materials Science

    • Magnetic properties of a mischmetal-cobalt alloy

      R A Tewari

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      The magnetic properties of a mischmetal-cobalt alloy are studied. A mischmetal-64% cobalt alloy was melted in induction furnace under a protective atmosphere of argon. The melt was solidified in a magnetic field of 7 kOe, and cooled to a temperature of 950° C and was thereafter quenched in water. Specimens of suitable dimensions were machined, heat-treated in the temperature range 1000–1100° C for various lengths of time and the magnetic properties evaluated. The (BH)max value was 10·3 MGOe which was associated with aBr value of 7 kG and Hc value of 5 kOe. The results obtained offer feasibility to design new MM-Co5 magnets through developments in processing technique.

    • Preparation and characterisation of Cd3P2, a II–V group compound semiconductor

      D R Rao V Bagulasankrithyan R A Tewari

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      Cadmium phosphide (α-Cd3P2) a II3–V2 compound semiconductor has been prepared by C/H2 reduction of cadmium phosphate. The reduction process is conducted at 550°C allowing the reaction to continue for 4 to 5 hr. The material always gets deposited on the walls of the quartz tube at different zones, which after analysis is found to contain, depending upon the location of the zone, Cd3P2, CdP2 and other cadmium rich phosphides. The resistivity of the pressed samples are of the order of 3 × 10−4Θ-cm. Optical absorption spectra of thin films, obtained by thermal evaporation on glass substrates, have exhibited broad bands around 620 nm.

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