Multicomponent solubilities among the sulfides and selenides of calcium and manganese
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The sulfide b i n a r y (CaS-MnS), like the s e l e n i d e b i n a r y (CaSe-MnSe), p o s s e s s e s full m i s c i b i l i t y i m m e d i a t e l y below the s o l i d u s . 1 A m i s c i b i l i t y gap f o r m s at lower t e m p e r a t u r e s in each s y s t e m . E a c h of t h e s e b i n a r i e s p o s s e s s e s a m i n i m u m in the liquidus in lieu of a e u t e c t i c . The MnS-MnSe b i n a r y 2 also has a m i n i m u m in the liquidus. However, it does not p o s s e s s a solid m i s c i b i l i t y gap. The CaS-CaSe s y s t e m is fully m i s c i b l e at both 1000~ and 1500~ It has not r e c e i v e d d e t a i l e d attention at t e m p e r a t u r e s approaching the s o l i d u s and liquidus. F i g u r e 1 s u m m a r i z e s these v a r i o u s data f r o m p r e v i o u s s t u d i e s by showing the bounding b i n a r i e s for the AX s e c t i o n t h r o u g h the C a - M n - S - S e q u a t e r n a r y . Co
MeM
CoS
nS
S
Se
I
25o01-
~.I U~,b/z l\\\\\
2000~\\
\
LIQUID
k
2000
\\ 1500
15o(; SOL,D ,~ D
S O L U T I O N~
1000
tr
'"
/
5oc
/
I
\
2
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5O0
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! jMOs
J______ . i CoS 0 CoSe
MnSe
Fig. 1 The CaS-CaSe-MnSe-MnSsystem, based on the bounding isotherms (1,2).
Multicomponent Solubilities Among the Sulfides and Selenides of Calcium and Manganese
CaS
---TIE 60
80 I
I
I
LINES 40 I
I
20
,
MnS
R----r~ 2O
80CHI-HUNG LEUNG AND LAWRENCE H. VAN VLACK
03
-
+
A r e c e n t p a p e r 1 d e s c r i b e s the phase r e l a t i o n s h i p s in the t h r e e b i n a r y chalcogenide s y s t e m s , CaS-MnS, CaSeMnSe, and C a T e - M n T e . That study, plus p r e v i o u s work by Mehta 2 s e r v e d as a b a s i s for f u r t h e r e x a m i n a t i o n of solid solution in the d o u b l e - s a l t s y s t e m , C a S - C a S e MnSe-MnS. T h i s is p a r t of the 4 - c o m p o n e n t s y s t e m , C a - M n - S - S e . Such c o m p o s i t i o n s a r e g e r m a n e to s e l e n i u m - c o n t a i n i n g s t e e l s that a r e deoxidized with c a l cium. CHI-HUNG LEUNG, formerly a graduate student at The University of Michigan,is now Metallurgistat Gibson Electric, Inc., Delmont, PA 15626. LAWRENCEH. VAN VLACK is Professor of MaterialsScience and Engineering,Department of Materials and MetallurgicalEngineering, The University of Michigan,Ann Arbor, MI 48109. Manuscript submitted June 18, 1979. 168-VOLUME lIB, MARCH 1980
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