Be-W Au-lnert Gases 6 0 P a l : R.M. Paine and J.A. Carrabine, '~Some New Intermetallic C o m p o u n d s of Beryllium," Acta Crystallogr., 13(8), 680-681
TR: Soy. Phys. Crystallogr., 8,349-351 (1963). (Equi Diagram, Crys Structure; Experimental) 6 6 S a m : G.V. Samsonov, "Chemistry of the Beryllides," Usp. Khim., 35(5), 779-822 (1966) in Russian; TR: Russ. Chem. Rev., 35(5), 339-361 (1966). (Equi Diagram; Review; #) *66Goh H.J. Goldschmidt and W.M. Ham, "The Tungsten-Rich End of the Tungsten-Beryllium System," J. Less-Common Mete, 10(1), 57-65 (1966). (Equi Diagram, Crys Structure; Experimental; #) 6 7 B u c : E. Bucher and C. Palmy, "Superconductivity and Isotope Effect in Bee2X Compounds and Molybdenum," Phys. Lett. A, 24(7), 340-341 (1967). (Equi Diagram; Experimental) 74Vas: E.A. Vasina and A.S. Panov, "Reactions Between Tungsten and Beryllium," Izv. Akad. Nauk, SSSR, Met., (1), 197199 (1974) in Russian; TR: Russ. MetaU., (1), 119-121 (1974). (Equi Diagram; Experimental) 74Zag: V.N. Zagryazkin and A.S. Panov, ~'Calculation of the Heat of Formation of Transition Metal Beryllides," Zh. Fiz. Khim., 48(6), 1519-1521 (1974) in Russian; TR: Russ. J. Phys. Chem., 48(6), 891-892 (1974). (Thermo; Theory) 8 0 T a n : L.E. Tanner, "The Stable and Metastable Phase Relations in the Hf-Be Alloy System," Acta Metall., 28(12), 18051816 (1980). (Equi Diagram; Theory) 86Kin: H. King, Bull. Alloy Phase Diagrams, to be published (1986). (Equi Diagram; Compilation) *Indicates key paper. #Indicates presence of a phase diagram.
(1960). (Equi Diagram, Crys Structure; Experimental) 6 1 B o o : J. Booker, R.M. Paine, and A.J. Stonehouse, ~'Investi-
gation of Intermetaltic Compounds for Very High Temperature Applications," Tech. Rep. WADD-TR-60-889 (AD 265625), 134 p (1961). (Equi Diagram; Experimental) 6 2 A r z : P.M. Arzhanyi, R.M. Volkova, and D.A. Prokoshkin, "Thermal Diffusion in the Tungsten-Beryllium System," Izv. Akad. Nauk SSSR, Otd. Tekhn. Nauk, Met. Topl., (6), 162-166 (1962) in Russian; TR: Russ. Met. Fuels, (6), 95-102 (1962). (Equi Diagram, Crys Structure; Experimental; #) 6 2 M a t : N.N. Matyushenko, L.F. Verkhorobin, N.S. Pugachev, and N.V. Sivokon', "The Crystal Structure of the Highest Beryllides of Molybdenum, Wolfram, and Rhenium," KrystalIografiya, 7(6), 862-864 (1962) in Russian; TR: Soy. Phys. Crystallogr., 7(6), 701-703 (1963). (Equi Diagram, Crys Structure; Experimental) *63Goh H.J. Goldschmidt, E.A. Catherall, W.M. Ham, and D.A. Oliver, "Investigation into the Tungsten-Rich Regions of the Binary Systems Tungsten-Carbon, Tungsten-Boron, and Tungsten-Beryllium," Tech. Rep. ASD-TDR-62-25. Pt. II (AD 418033), 37-70 (1963). (Equi Diagram, Crys Structure; Experimental; #) *63Kri: P.I. Kripyakevich and E.I. Gladyshevskii, "The Crystal Structures of Beryllium-Rich Compounds in the Systems MoBe and W-Be," Kristallografiya, 8,449-451 (1963) in Russian;
Be-Wevaluation confributed by L.E. Tanner, L-217, Lawrence LivermoreNational Laboratory, P.O. Box 808, Livermore,CA 94550, USA, and H. Okamoto, B77G, Lawrence Berkeley Laboratory, Berkeley, CA 94720, USA. Work was supported by the U.S. Department of Energy under contract No. W-7405-Eng-48 and American Society for Metals (ASM). Literature searched through 1984. Part of the bibliographic search was provided by ASM. L.E. Tanner and H. Okamoto are the ASM/NBSData Program Co-Category Editors for binary beryllium alloys.
The Gold-Inert Gas Systems By H. Okamoto and T.B. Massalski Carnegie-Mellon University No phase d i a g r a m is a v a i l a b l e for the A u - i n e r t gas systems. Th e m e l t i n g (or triple) and boiling points of Au and t h e i n e r t g a s e s (He, Ne, A r , K r , Xe, Rn) a r e l i s t e d in
Table 1. [68Gull e s t i m a t e d the solubility of each gas in (Au) to be 10 6 to 10 -7 at.% based on t h e position of the gas e l e m e n t in t h e periodic table.
Table 1
Melting and Boiling Points of Au and Inert Gases [Melt, 81Kir]
Element
I
Au . . . . . . . He . . . . . . . Ne . . . . . . . Ar . . . . . . .
Melting or triple point I T- Boiling point(a) ~ ~ K kPa ~ K
1064.43 (b) -248.587 -189.352
(a)l atm pressure.
Table 2
1337.58 (b) 24.563 83.798
(a) .... 43.37 68.90
2857 268.935 -246.048 -185.87
3130 4.215 27.102 87.28
I
Kr . . . . . . . Xe . . . . . . . Rn . . . . . . .
-157.385 -111.7582 -71
1 1 5 . 7 6 5 73.15 161.3918 81.66 202 70
r - Boiling point(a) ] -~ K-
-153.36 -108.13 -62
119.79 165.02 211
(b)Notriple point.
Au-lnert Gases Crystal Structure and Lattice Parameter Data Pearson symbol
Phase
(Au) . . . . . . . . . . . . . . . . . . . cF4 (sHe) . . . . . . . . . . . . . . . . . . hP2 (Ne) . . . . . . . . . . . . . . . . . . . cF4 (Ar) . . . . . . . . . . . . . . . . . . . cF4 (Kr) . . . . . . . . . . . . . . . . . . . cF4 (Xe) . . . . . . . . . . . . . . . . . . . cF4 (Rn) . . . . . . . . . . . . . . . . . . . ?
Space group
Strukturbericht designation
Prototype
Fm3m P6Jmmc Fm3m Fm3m Fm3m Fro3 m
A1 A3 A1 A1 A1 A1 ?
Cu Mg Cu Cu Cu Cu ?
?
Note: From [Kingl].
358
Melting or triple point ~ ~ K kPa
Element
B u l l e t i n of Alloy P h a s e D i a g r a m s
Vol. 7
No. 4
1986
Lattice parameters, n m a c
Comment
0.40784 0.3577 0.44622 0.40784 0.56459 0.6132 ?
At 25 ~ At 1.5 K At 4.2 K At 4.2 K At 4.2 K At 4.2 K ...
... 0.5842 -.. ... ----. ?
Au-lnert Gases Ag-lr Alloys," in Phase Diagrams of Metallic Systems, E.M. Savitskii, Ed., Akad. Nauk SSSR, 267-273 (1968) in Russian. (Equi Diagram; Theory) 81Kir: R.E. Kirk and D.F. Othmer, Encyclopedia of Chemical Technology, Vol. 12, 3rd ed., Interscience Publishers, New York, 254 (1981). (Equi Diagram; Compilation)
The crystal s t r u c t u r e s and lattice p a r a m e t e r s of the pure elements are given in Table 2.
Cited References 68Gul: B.B. Gulyaev and G.F. Dvorshkaya, "Generalization of the Phase Diagram of Binary Copper-, Silver-, and Gold-Base
Au-inert gases evaluation contributed by H. Okamoto and T.B. Massalski, Department of Metallurgical Engineering and Materials Science, CarnegieMellon University, Pittsburgh, PA 15213, USA. Work was supported by the International Gold Corporation Limited (]nterGold) and American Society for Metals (ASM). Literature searched through 1984. Part of the bibliographic search was provided by ASM. Professor Massalski is the ASM/NBS Data Program Editor-in-Chieffor Binary Alloys and is also Co-Category Editor for binary gold alloys with Dr. Okamoto.
The Ag-lr (Silver-Iridium) System 107.8682
192.22
By I. Karakaya and W.T. Thompson Royal Military College of Canada
Equilibrium Diagram
lute alloys from the m i c r o h a r d n e s s v a l u e s for the pure ele m e n t s i n d i c a t e t h a t t h e solid s o l u b i l i t i e s of I r in (Ag) and of A g in (Ir) are less t h a n 0.3 at.% Ir and 1.8 at.% Ag, respectively.
An e q u i l i b r i u m d i a g r a m b a s e d on e x p e r i m e n t a l d a t a is not a v a i l a b l e in t h e l i t e r a t u r e for the Ag-Ir system. Ir is insoluble in liquid A g [00Ros]. M e a s u r e m e n t s of microh a r d n e s s , e l e c t r i c a l r e s i s t i v i t y , t h e r m o - e m f , a n d microstructure indicate v e r y s m a l l solid s o l u b i l i t y of Ir in (Ag) and of A g in (Ir) [59Rud]. The most d i l u t e alloys (0.3 at.% Ir and 1.8 at.% Ag) h a v e been r e p o r t e d to occur in the two-phase region. A c h a n g e in m i c r o h a r d n e s s of di-
M e t a l l o g r a p h i c studies of A g - I r alloys did not show t h e presence of a n y i n t e r m e d i a t e p h a s e s [59Rud]. Differential t h e r m a l a n a l y s i s of Ag-rich alloys indicated t h a t t h e m e l t i n g points of the alloys were v e r y close to t h e melting point of pure Ag. A n a p p r o x i m a t e phase d i a g r a m cal-
Fig. 1 Assessed Ag-lr Phase Diagram (Approximate) Wei~hL Percent Iridium 0 IO 2 5 0 0 ~ . . . .'
20 i .......
30 r .....
40 '
50 ,. . . . - - ~
,
C+Lo
1
60
70
~ q
80
90
i00 L
.............................
~
:
"'2447~
98.5
C + (Ir) 2177~
L1,/
2000-
/i
i n t l i l #
q) o
l L, +
(Ir)
1500-
961~
I000
(Ag)
(It)
-
90
100
5oo.-~ 0
Ag
10
30
40
50
60
70
80
Atomic Percent Iridium
Ir I. Karakaya and W.T. Thompson, 1986.
B u l l e t i n of A l l o y P h a s e D i a g r a m s
Vol. 7
No. 4
1986
359
