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Title:Quenched-in lattice defects in gold
Author(s):Bauerle, James Edward
Doctoral Committee Chair(s):Koehler, J.S.
Department / Program:Physics
Subject(s):Quenched-in lattice defects
Issue Date:1957
Citation Info:High purity gold wires of 16 and 30 mil diameters were heated to temperatures in the range from 450°C. to 1,000°C. and then quenched to room temperature in water. The time required for the cooling was between 10 and 50 milliseconds. An increase in the residual resistivity was observed which could be described by the equation ∆ϸ = Ae-EF/KTQ. Here ∆ϸ is the extra resistivity, A is a constant equal to (4.9 ± 10 0) x 10^-4.Ω cm., EF is an energy of formation equal to 00 98 ± 0.03 ev., K is Boltzmann's constant, and TQ is the temperature from which the quench was made. The reSistivity increase annealed in the neighborhood of 40°C. with an activation energy for motion ranging from 0.82 ± 0.05 ev. for a quench from 700°C. to 0.60 ± 0.04 eV. for a quench from l,000°C. The annealing kinetics were first order for quenches from 700°C. and below but were more complex for quenches from above this temperature. The 'half-anneal' times at 40°C. ranged from 140 hrs. for a quench from 700°C. to 1/2 hr. for a quench from 1,000°0. During the anneals a decrease in specimen length was observed which was at all times proportional to the decrease of the extra resistivity, both for the quenches having first order annealing kinetics and those having the more complicated annealing behavior. The proportionality constant between the resistivity changes and the fractional length changes was about 1.1 x 10^-3Ω cm. An analysis of the data suggests that the extra resistivity after the quench was due to the 'freezing-inn of the equilibrium concentration of lattice vacancies present at the original the higher temperature. It is fUrther proposed that single vacancies have an energy of formation of 0098 eVe and an energy of motion of 0.82 eV. The variation in the observed energy of motion is accounted for by assuming that divacancies have a small binding energy, i.e., less than 0.2 ev. and an energy of motion in the neighborhood of 0.6 ev.; thus, at the higher concentrations the increased association of vacancies would give a smaller observed energy of motion. The length change measurements indicate that the constant A, when converted to concentration, lies between 1 and 1.5, and that the resistivity due to 1 atom per cent of vacancies in gold may be about twice that calculated theoretically.. A calculation of the number of jumps made by the defects during their lifetime gives a constant equal to about 10^6 , which might suggest the occurrence of vacancy clustering during the quench or the anneal.
Genre:Dissertation / Thesis
Other Identifier(s):2448725
Publication Status:published or submitted for publication
Rights Information:© 1957 James Edward Bauerle
Date Available in IDEALS:2010-07-16

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