La-Si (Lanthanum-Silicon)
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Supplemental Literature Review: Section III
La-Si (Lanthanum-Silicon) H. Okamoto
The La-Si phase diagram was unknown in [Massalski2]. Figure 1 shows the La-Si phase diagram determined by [2001Bul] by using differential thermal analysis, metallography, and x-ray diffraction. Table 1 shows La-Si crystal structure data given in [Massalski2] with the composition ranges modified to agree with [2001Bul].
Table 1
Composition, Pearson at.% Si symbol
Phase (cLa) (bLa) (aLa) La5Si3 La3Si2 La5Si4 LaSi aLaSi2 bLaSi2 (Si)
References 2001Bul: M.V. Bulanova, P.N. Zheltov, K.A. Meleshevich, P.A. Saltykov, G. Effenberg, and J.C. Tedenac, Lanthanum-Silicon System, J. Alloys Compd., 2001, 329, p 214-223
La-Si crystal structure data
0 to 2 0 to 1.5 0 37.5 40 44.4 50 62.5 to 64 64.5 to 67 100
cI2 cF4 hP4 tI32 tP10 tP36 oP8 oI12 tI12 cF8
Space group
Struktur bericht designation Prototype
Im3m Fm3m P63/mmc I4/mcm P4/mbm P41212 Pnma Imma I41/amd Fd 3m
A2 A1 A3¢ D8l D5a ... B27 ... Cc A4
W Cu aLa Cr5B3 Si2U3 Zr5Si4 FeB aGdSi2 ThSi2 C (diamond)
Weight Percent Silicon 0
10
20
1800
30
50
40
60 70 80
100
1730°C 1620°C 1570°C
1600
L
1600°C
55.5 1528°C
1470°C
1414°C
1400 1260°C 1205°C 82
1000
(γ La)
918°C 865°C 800
815°C 722°C
(Si)
βLaSi2
αLaSi2
400
LaSi
(β La)
La5Si4
600
La3Si2
11
La5Si3
Temperature, °C
1200
310°C 200
(α La)
0 0
La
10
20
30
40
50
60
70
80
Atomic Percent Silicon
90
100
Si
Fig. 1 La-Si phase diagram
Journal of Phase Equilibria and Diffusion Vol. 28 No. 6 2007
585
