The melting curve of NaCb,Br,, has been measured under pressure up to 4.5GPa. The melting temperatures of Ag and NaCl have been used to determine the pressure in the sample at its melting temperat ure .
The classical electric pulse technique has been adapted to measurements of specific heat at high pressure. A wire specimen is heated by a 100 "sec pulse, stabilized at I = 50 A. The resulting temperature rise is extracted from the voltage drop U over the sample by means of a bridge circuit. The specific heat is obtained from the formula c p = C (T, P)U 11m e, where C (T, P) is a function to be experimentally determined for a given sample, m the mass of the sample, and e the time derivative of the bridge output voltage. A procedure has been developed for in situ corrections of e for heat loss to the medium surrounding the wire. Digital techniques are used for the pulse analysis. The method has been used to ascertain the pressure dependence of c p for Cu up to 100 kilobars at room temperature. The relative change in c p was found to be 2.8 X 10-4 /kilobar.
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