PRESSURE EFFECT ON VACANCY FORMATION IN GOLD
Abstract
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 1/100 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 Koehler's 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 cm/at.% and the vacancy concentration after quenching from 680 C at room pressure with 1/6 x 1/100 sec half-life of the temperature decay is (2, 4 = 0.5) x 10 to the minus 5th power.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1962
- Accession Number
- AD0404173
Entities
People
- C. G. Homan
- R. P. Huebener