The niobium (columbium)-palladium constitution diagram
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the c o u r s e of an extended study of the phase d i a g r a m s of r e f r a c t o r y m e t a l s , a n u m b e r of T~-T1.0 s y s t e m s , i . e . , b i n a r y s y s t e m s c o m p o s e d of one of the T5 t r a n s i t i o n m e t a l s V, Nb, or T a on the one side and one of the Tlo m e t a l s , P d or Pt, on the o t h e r , have been i n v e s t i g a t e d in a c o l l a b o r a t i v e effort. Of the six s y s t e m s thus defined, s t u d i e s of the V - P t s y s t e m , 1 the T a - P d s y s t e m 2 and the P t - r i c h p o r t i o n of the T a - P t s y s t e m 3 have a l r e a d y b e e n p r e s e n t e d ; for V - P d a phase d i a g r a m is given in the l i t e r a t u r e . 4 The p r e s e n t p a p e r r e p o r t s the N b - P d s y s t e m ; the r e m a i n i n g s y s t e m , N b - P t , will be r e p o r t e d in a s u b s e q u e n t p u b l i c a tion. E a r l y s u r v e y s of the N b - P d s y s t e m a r e due to G r e e n f i e l d and Beck S and Knapton; 6 c r y s t a l c h e m i c a l s u r v e y s of i n t e r m e d i a t e p h a s e s were made i n d e p e n dently by G i e s s e n , P a r k e r and G r a n t 7 (also r e p o r t e d in Ref. 8) and Maldonado and Schubert; 9 Pd(Nb) t e r m i n a l solid s o l u t i o n s w e r e studied by K u d i e l k a A r t n e r and A r g e n t 1~ and C a t t e r a l l and B a r k e r ; 1~ i n dividual i n t e r m e d i a t e p h a s e s were r e p o r t e d by Dwight ~2 and G i e s s e n and G r a n t ; ~3 p h a s e d i a g r a m s were worked out by S a v i t s k i i et al, ~4 P a r k e r , 1.~ and B o w e r s 1.~ (only the f i r s t of t h e s e has b e e n published); r e v i e w s were g i v e n e . g . by Shunk ~v and P e a r s o n . ~8 The following alloy p h a s e s were r e p o r t e d : t e r m i n a l solid s o l u t i o n s with e x t e n s i v e mutual solubilities;6,14 acr phase at ~ ND2Pd 5'7'1.4'1.5'16 or as a h i g h - t e m p e r a t u r e p h a s e at Nb3Pd29 (however, in c o n t r a s t to t h i s , no ~ phase was o b s e r v e d by Knapton6); a Iow t e m p e r a t u r e phase Nb3Pd2 (NbRu s t r u c t u r e type); 9 an u n i d e n t i f i e d high t e m p e r a t u r e phase ot-Nbpd 7 or Nb2Pd3; 16 N b P d J '9'~'~a'1.5 (MoPt2[= NbPt2] s t r u c t u r e B. C. GIESSEN is Professor of Chemistry and MechanicalEngineering, Northeastern University, Boston, MA 02115, N. J. GRANT is Professor of Materials Science and Engineering,Massachusetts Institute of Technology, Cambridge, MA 02139, D. P. PARKER, formerly with M1T is now President, Parker & Associates,Wellesley,MA 02181, R. C. MANUSZEWSKI,formerly with the ADAHF Research Unit at NBS, is now Production Engineer, Morganite Corporation, Dunn, NC 38334, and R. M. WATERSTRATis Research Associate, ADAHF Research Unit, National Bureau of Standards, Washington, DC 20234. Manuscript submitted August 21, 1978, METALLURGICALTRANSACTIONSA
t e9,13~ . ~ ~ - - 7,8,9,12,1.4,15,16 r 1~ " ~ :'~d 7 t ~ i A ~ type v,9,~) and fl-NbPd3 (fl-NbPd3 typeS,1.9). The p r i n c i p a l c o n f
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