• N Mehta

      Articles written in Bulletin of Materials Science

    • Study of electrical properties of glassy Se100–𝑥Te𝑥 alloys

      N Mehta A Dwivedi R Arora S Kumar A Kumar

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      Temperature and frequency dependence of a.c. conductivity have been studied in glassy Se100–𝑥Te𝑥 (𝑥 = 10, 20 and 30) over different range of temperatures and frequencies. An agreement between experimental and theoretical results suggests that the a.c. conductivity behaviour of selenium–tellurium system (Se100–𝑥Te𝑥) can be successfully explained by correlated barrier hopping (CBH) model. The density of defect states has been determined using this model for all the glassy alloys.

      The results show that bipolaron hopping dominates over single-polaron hopping in this glassy system. This is explained in terms of lower values of the maximum barrier height for single-polaron hopping. The values of density of charged defect states increase with increase in Te concentration. This is in agreement with our previous results obtained from SCLC measurements.

    • Calorimetric studies of non-isothermal crystallization in amorphous Cu𝑥Ti100–𝑥 alloys

      N Mehta K Singh N S Saxena

      More Details Abstract Fulltext PDF

      The present paper reports the composition dependence of pre-exponential factor and activation energy of non-isothermal crystallization in amorphous alloys of Cu𝑥Ti100–𝑥 system using differential scanning calorimeter (DSC) technique. The applicability of Meyer–Neldel relation between the pre-exponential factor and activation energy of non-isothermal crystallization for amorphous alloys of Cu–Ti system was verified.

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