• Piyush Kuchhal

      Articles written in Pramana – Journal of Physics

    • Thermal effect and equation of state in solids

      Piyush Kuchhal Narsingh Dass

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      In the present paper, an attempt has been made to include the thermal effect into an isothermal equation of state using the Debye approximation representing volume as a function of pressure. The calculations are done in case of NaCl, CsCl, Mo, and W. The present calculations are in good agreement with the reported results.

    • An equation of state and non-linear parameter from sound velocity measurements for liquid alkali metals

      Piyush Kuchhal Ravindra Kumar Narsingh Dass

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      In the present paper, an equation of state has been obtained in case of liquid alkali metals like Na, K, Rb and Cs from sound velocity measurements. The theory developed gives very good agreement for both the sound velocity and the volume as a function of pressure at different temperatures in these liquid alkali metals. Further, the variation of non-linear parameter,B / A, as a function of pressure and temperature is also studied.

    • Pressure-volume calculation in bcc metals using Born stability criteria

      Piyush Kuchhal Narsingh Dass

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      A simple analytical two-body potential φ(r) = −Ar−n + B exp(−prm) is considered for P-V calculations in bcc metals using Born stability criteria. It is shown that the stability of bcc metals can be expressed uniquely as a function of a parameter q (discussed in the text). The P-V calculations are done in ten bcc metals. The calculations are compared with the experimental data of shock-wave measurements and also with other potential available. It is found out that the present potential is better than the other two-body potentials in case of bcc metals. Further, the calculations done for TOEC and the first pressure derivative of SOEC are found in good agreement with the reported results.

    • New isothermal equation of state of solids applied to high pressures

      Piyush Kuchhal Narsingh Dass

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      In the present paper, a new two-parameter inverted equation of state (EOS) is developed which is found to be working very well in the high-pressure region. To check its success and validity, this EOS has been applied in a number of solids. The computed volume compression is found to be in very good agreement with the experimental data in the whole range of pressure in all the solids. The minimum and the maximum pressure range used in the present study is 0–320 kbar and 0–3000 kbar, respectively.

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