Uniaxial pressure dependence of the Debye temperature in metals

The electrical resistance and its temperature coefficient have been measured Ibr a platinmn lbil as a function of uniaxial pressure over the pressure range 0 to 60 MPa. The measurements were perlbrmed at room temperature using the transient hot-strip method. The data are analyzed using the electrical resistivity Ibrmula within the Block Grfineisen approximation. The pressure dependence of the Debye temperature was directly obtained from an expansion of this formula and using the basic delinition of the temperature resistivity coelticient. The reliability of the experimental data was then verilied using the basic definition of Griineisen constant. Within the investigated pressure range, the analysis supports the iInterpretation that the change in resistance of platinum under pressure is mainly due to the change in the amplitude of the atomic vibrations that are directly related to the change in Debye temperature. The pressure dependence of resistance and the Debye temperature of the platimtm were reasonably good in spite of the approximations involved.