PRESSURE EFFECT ON VACANCY FORMATION IN GOLD
WATERVLIET ARSENAL NY
Pagination or Media Count:
Pure gold wires 99.999 were resistance heated to 680 C in a gasous medium at pressures between 400 and 11,000 atmospheres and quenched by turning off the heating current. The temperature decayed exponentially with a half-life of 1.6 x 1100 sec. The logarithm of the quenched-in electric resistance delta R decreased linearly with increasing pressure. From the pressure effect on delta R an activation volume for vacancy formation at 680 C of delta V sub f 9.16 0.68 x 10 to the minus 24 power cc 0.53 0.04 atomic volumes is derived, assuming that the quenched-in resistivity is due to the formation of single vacancies. In the pressure range investigated, delta V ssub f is apparently independent of the pressure. Using delta V sub f and Bauerle and Koehlers relationship between the resistivity and the fractional volume change during recovery, the electric resistivity of vacancies is 1.8 0.4 x 10 to the minus 6th power ohm cmat. and the vacancy concentration after quenching from 680 C at room pressure with 16 x 1100 sec half-life of the temperature decay is 2, 4 0.5 x 10 to the minus 5th power.
- Solid State Physics