The annealing twin frequency of compressed zone-refined lead
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cute is c o n t r o l l e d b y the diffusion p r o c e s s in the s i l i c a t e , although the Eq. [2] could not be s a t i s f i e d . In s u m m a r y , it is shown that r o t a t i n g d i s k e l e c t r o d e technique was a p p l i e d s u c c e s s f u l l y to a k i n e t i c study on the c h a r g e t r a n s f e r r e a c t i o n b e t w e e n m o l t e n s i l i c a t e and s o l i d p l a t i n u m . 1. V. G. Levich: Physicochemical Hydrodynamics, pp. 60-72. Prentice.HaU, Englewood Cliffs, New Jersey, 1962. 2. M. Kawakami and K. S. Gate: Met. Tran&, 1973, vol. 4, pp. 1097-1101. 3. Mitsuhisa Himo, Tatsuhiko Ejima and Mitsuo Kameda: J. Japan Inst. Metals, 1967,v01.31,pp. 114 -19. 4. Tatstthiko Ejima and Mitsuo Kameda: ibid, 1967, vol. 31, p. 120. 5. A. C. Riddiford: Advances in Electrochemistry and Electrochemical, P. Delahay, ed., pp. 47-116, Interscience PUblishers, New York, 1966, 6. R. Kammel and H. Winteshager: Erzmetall, 1965, vol. 18, H. 1, p. 9. 7. P. Kozakevitch: Rev. Met., 1960, vol. 57, p. 149.
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The Annealing Twin Frequency of Compressed Zone-Refined Lead
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F i g . 3 - - S c h e m a t i c d i a g r a m of m e a s u r i n g c o n d i t i o n s to o b t a i n steady state currents. 2 2 4 6 - V O L U M E 5, OCTOBER 1974
The f o r m a t i o n and abundance of a n n e a l i n g twins in m e t a l s have b e e n s t u d i e d e x t e n s i v e l y 1-~3 and f a c t o r s which can a f f e c t a n n e a l i n g twin f r e q u e n c y d o c u m e n t e d , a R e s u l t s of e x p e r i m e n t s on a n n e a l i n g twin f r e q u e n c y a r e , h o w e v e r , often c o n t r a d i c t o r y . F o r e x a m p l e , it h a s b e e n r e p o r t e d that a n n e a l i n g twin f r e q u e n c y is independent of J. A. EADY, forlnerly a Post-Doctoral Fellow at the University of Guelph, Guelph, Ontario, Canada, is now Comalco Research Associate, Department of Mining and Metallurgical Engineering, University of Queensland, St. Lucia, 4067, Queensland, Australia. W. C. WINEGARD is President, University of Guelph, Guelph, Ontario, Canada. Manuscript submitted September 5, 1973. METALLURGICAL TRANSACTIONS
annealing temperature,~'9 d e c r e a s e s with i n c r e a s i n g annealing t e m p e r a t u r e x or depends a or does not depend s on a combination of t e m p e r a t u r e and the time at this t e m p e r a t u r e . A s i m i l a r d e g r e e of uncertainty e x i s t s for many of the other p o s s i b l e v a r i a b l e s and it is c l e a r that the exact effect of these v a r i a b l e s , both individually and in combination, is not well understood. This note d e s c r i b e s work designed to investigate the effect of temperature on the annealing twin frequency of z o n
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