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Papers by Mithlesh Kumari

physica status solidi (b), 1986

A simple theory is developed to study the pressure dependence of Grüneisen parameter, γ. The fina... more A simple theory is developed to study the pressure dependence of Grüneisen parameter, γ. The final results show that γ varies linearly with the pressure, that is, γ(p, T) = γ(0, T) – ηp where η is found to be a pressure‐independent but temperature‐dependent parameter. Moreover, it is shown that η is related to some other thermodynamic parameters and hence can have positive or negative magnitude which in turn will decide whether γ(p, T) decreases or increases with pressure. The calculated values of γ(p, T) in the whole range of pressure and temperature are found in very good agreement with the experimental results in case of all the solids studied like NaCl, CaF2, MgO, quartz, Na, K, and Li. Further, it is shown that the second Grüneisen parameter, q, and the Debye temperature, θ, can also be calculated as a function of pressure with the help of the present theory.

physica status solidi (b), 1984

Making use of the isothermal Anderson‐Grüneisen parameter as derived by Dass and Kasir, the value... more Making use of the isothermal Anderson‐Grüneisen parameter as derived by Dass and Kasir, the values of the volume coefficient of thermal expansion and Grüneisen parameter are calculated as functions of pressure and temperature both in the case of sodium chloride. It is shown thatthe agreement between the calculated and the experimental values is very good. Further, it is shown that a general equation of state for solids can beeasily transferred to Birch's equation of state under the assumption that the isothermal bulk modulus varies linearly with the pressure.

Journal of Physics: Condensed Matter, 1990

For pt.I see ibid., vol.2, p.3219 (1990). The equation of state suggested by the authors has been... more For pt.I see ibid., vol.2, p.3219 (1990). The equation of state suggested by the authors has been applied to 50 solids. The maximum pressure range and the minimum pressure range used in the present study are 0-4500 kbar and 0-100 kbar, respectively. Very good agreement is found between the calculated and experimental values of V(P, T0)/V(0, T0) for all the solids.

Journal of Applied Physics, 1991

ABSTRACT

Journal of Non-Crystalline Solids, 1993

The theoretical temperature dependence of density of molten salts is developed. • The theoretical... more The theoretical temperature dependence of density of molten salts is developed. • The theoretical temperature dependence of thermal conductivity of molten salts is developed. • Correlations of unary molten-salt can be extrapolated to low-temperature eutectic region.

Journal of Non-Crystalline Solids, 1990

Indian Journal of Pure Applied Physics, 1991

Physica Status Solidi (a), 1987

physica status solidi (b), 1986

A simple theory is developed to study the pressure dependence of Grüneisen parameter, γ. The fina... more A simple theory is developed to study the pressure dependence of Grüneisen parameter, γ. The final results show that γ varies linearly with the pressure, that is, γ(p, T) = γ(0, T) – ηp where η is found to be a pressure‐independent but temperature‐dependent parameter. Moreover, it is shown that η is related to some other thermodynamic parameters and hence can have positive or negative magnitude which in turn will decide whether γ(p, T) decreases or increases with pressure. The calculated values of γ(p, T) in the whole range of pressure and temperature are found in very good agreement with the experimental results in case of all the solids studied like NaCl, CaF2, MgO, quartz, Na, K, and Li. Further, it is shown that the second Grüneisen parameter, q, and the Debye temperature, θ, can also be calculated as a function of pressure with the help of the present theory.

physica status solidi (b), 1984

Making use of the isothermal Anderson‐Grüneisen parameter as derived by Dass and Kasir, the value... more Making use of the isothermal Anderson‐Grüneisen parameter as derived by Dass and Kasir, the values of the volume coefficient of thermal expansion and Grüneisen parameter are calculated as functions of pressure and temperature both in the case of sodium chloride. It is shown thatthe agreement between the calculated and the experimental values is very good. Further, it is shown that a general equation of state for solids can beeasily transferred to Birch's equation of state under the assumption that the isothermal bulk modulus varies linearly with the pressure.

Journal of Physics: Condensed Matter, 1990

For pt.I see ibid., vol.2, p.3219 (1990). The equation of state suggested by the authors has been... more For pt.I see ibid., vol.2, p.3219 (1990). The equation of state suggested by the authors has been applied to 50 solids. The maximum pressure range and the minimum pressure range used in the present study are 0-4500 kbar and 0-100 kbar, respectively. Very good agreement is found between the calculated and experimental values of V(P, T0)/V(0, T0) for all the solids.

Journal of Applied Physics, 1991

ABSTRACT

Journal of Non-Crystalline Solids, 1993

The theoretical temperature dependence of density of molten salts is developed. • The theoretical... more The theoretical temperature dependence of density of molten salts is developed. • The theoretical temperature dependence of thermal conductivity of molten salts is developed. • Correlations of unary molten-salt can be extrapolated to low-temperature eutectic region.

Journal of Non-Crystalline Solids, 1990

Indian Journal of Pure Applied Physics, 1991

Physica Status Solidi (a), 1987