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*data for ICSD #43580
Coll Code 43580
Rec Date 2000/07/15
Mod Date 2006/04/01
Chem Name Terbium - Alpha
Structured Tb
Sum Tb1
ANX N
D(calc) 8.26
Title High temperature allotropy and thermal expansion of the rare earth
metals
Author(s) Hanak, J.J.;Daane, A.H.
Reference Journal of the Less-Common Metals
(1961), 3, 110-124
Acta Crystallographica (1,1948-23,1967)
(1956), 9, 559-563
Golden Book of Phase Transitions, Wroclaw
(2002), 1, 1-123
Unit Cell 3.599 3.599 5.696 90. 90. 120.
Vol 63.89
Z 2
Space Group P 63/m m c
SG Number 194
Cryst Sys hexagonal
Pearson hP2
Wyckoff c
Red Cell P 3.599 3.599 5.696 90 90 120 63.895
Trans Red 1.000 0.000 0.000 / 0.000 1.000 0.000 / 0.000 0.000 1.000
Comments Stable from 220 to 1590 K, expansion coeff. along a:
3.37*10exp-5, along c: 6.9*10^-5
Cell from 2nd reference: 3.6010, 5.6936
Stable from 220 to 1560 K (3rd ref., Tomaszewski), below
Cmcm, above Im3-m, m.p. 1629 K
The structure has been assigned a PDF number (calculated
powder diffraction data): 01-089-2925
The structure has been assigned a PDF number (experimental
powder diffraction data): 2-899
Structure type : Mg
X-ray diffraction from single crystal
No R value given in the paper.
At least one temperature factor missing in the paper.
Atom # OX SITE x y z SOF H
Tb 1 +0 2 c 0.3333 0.6667 0.25 1. 0
*end for ICSD #43580 |
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