On the observation of Bardeen-Herring sources in silicon
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1. K. C. Antony:Dispersion Strengthened o~Titanium Alloys, AFML.TR-67-352, DefenseDocumentationCenter, 1967.
On the Observation of Bardeen-Herring Sources in Silicon K . V . RAVI G L I D E d i s l o c a t i o n s o u r c e s of the F r a n k - R e a d type g i v i n g r i s e to a m u l t i p l e s y s t e m of c o n c e n t r i c d i s l o c a tion loops have b e e n o b s e r v e d in s i l i c o n . * The e x i s t e n c e of c l i m b s o u r c e s was f i r s t p r o p o s e d by B a r d e e n and H e r r i n g f In t h i s m e c h a n i s m of d i s l o c a t i o n m u l t i p l i c a tion edge c o m p o n e n t s a r e p o s t u l a t e d to c l i m b due to the p r e s e n c e of a n o n e q u i l i b r i u m c o n c e n t r a t i o n of point d e f e c t s in the v i c i n i t y of the d i s l o c a t i o n . Edge d i s l o c a tions a b s o r b o r e m i t point d e f e c t s and r e e s t a b l i s h e q u i l i b r i u m c o n d i t i o n s . When the edge s e g m e n t s a r e pinned at e i t h e r end by o t h e r d i s l o c a t i o n s which cannot c l i m b o r by s e c o n d p h a s e p a r t i c l e s o r p r e c i p i t a t e s t h e s e s e g m e n t s w i l l bow out n o r m a l to the slip plane to f o r m c i r c u l a r loops until the line t e n s i o n of the d i s l o c a t i o n b a l a n c e s the c l i m b f o r c e on the d i s l o c a t i o n . In a m a n n e r a n a l o g o u s to the F r a n k - R e a d glide s o u r c e the o r i g inal edge s e g m e n t can function a s a c l i m b s o u r c e f o r many c o n c e n t r i c d i s l o c a t i o n l o o p s . The o p e r a t i o n of t h i s m e c h a n i s m of d i s l o c a t i o n g e n e r a t i o n o r m u l t i p l i c a t i o n has b e e n o b s e r v e d in a n u m b e r of ionic c r y s t a l s . P a r a s n i s and M i t c h e l l s h a v e o b s e r v e d c l i m b p h e n o m e n a K. V. RAVI is Manager, Metallurgical Research and Technology Section, Central Research Laboratories, Motorola, Inc., Semiconductor Products Division, Phoenix, Ariz. Manuscript submitted December 14, 1971. METALLURGICALTRANSACTIONS
2. P. A. Russo, S. R. Seagle,and H. B. Bomberger:Development ofa 900~ Titanium Alloy, AFML-TR-70-125,DefenseDocumentationCenter, 1970. 3. T. K. Redden and C. E. Shamblen:900~ Titanium Alloy Development, AFMLTR-70-168, DefenseDocumentationCenter, 1970. 4. K. C. Antony: Trans. TMS-AIME, 1968,vol. 242, p. 1454. 5. H. Schachner, E. Cerwenka,and H. Nowotny:Monatstt Che~, 1954,vol. 85, p. 245. 6. K. Amark,B. Boren,and A. Westgren:Sv. Ker~ Tidskr., 1936, vol.48, p. 273.
in m i x e d c r y s t a l s of s i l v e r c h l o r i d e and c u p r i c c h l o r i d e . Bontinck and A m e l i n c k x 4 have o b s e r v e d d i s l o c a tion loops in c a l c i u m f l u o r i d e c r y s t a l s in which the d i s l o c a t i o n s w e r e d e c o r a t e d with m e t a l p a r t i c l e s . The only e v i d e n c e for the e x i s t e n c e of c l i m b s o u r c e s of the B a r d e e n - H e r r i n g type in s i l i c o n
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