124-125.
lithium Hydride, LiH, and lithium Deuteride, 1iD
E U G E N E STARITZKY and DONALD I. W A L K E R ' , The University of California, Los Alamos Scientific Laboratory, Los Alamor, N. M. ITHIIW
determined by Zintl and Harder ( 1 ) to he of the sodium rhloride type. Space group Fm3m or 0;. Cell Dimensions. For lithium hydride a" = 4.0834 & 0.0005 A, cell volume 68.09 A3 For lithium deuteride a0 = 4.0684 f 0 . 0 0 0 ~&4., cell volume 67.34 A? Zintl and Harder ( 1 ) reported for lithium hydride a" = 4.093 -4.;for lithium deuteride ao = 4.073 A. Formula Weights per Cell. 4. Formula Weight. Lithium hydride 7.948; lithium deuteride 8.954. Density (X-Ray). Lithium hydride 0.776 gram per rc.; lithium deuteride 0.883 gram per re.
hydride and lithium deliteride are prepared by heating
L lithium metal in an atmosphere of hydropn or tieuteriiim. ~IORPHOLOGY Svstem and Class. Isometric hexoctahedial. Habit. Cubic { 100 1. Cleavage. Ciibic { 100 1, perfect.
("RYSTAL
I
Powder X-Ray Diffraction Patterns of Lithium Hydride and Lithium Deuteride h11 111 200 220
OPTICALPROPERTIES Isotropic.
LiD
LiH d , .I., calcd.
d, A T obsd. 2,357 2.041 1.444 1.231 1.178
d, A.. calcd. 2.3489 2 0342 1 4384 1.2267 1.1745 1.01710 0 93335 0.90972 0,83040 0 78296
d , .La obsd.
T/llh
2.351 54 2.3576 100 2.033 2.0417 40 1.438 1.4437 23 1.2312 :ill 1.227 11 222 1.175 1.1788 3 1.02085 400 1,0204 1.0166 8 0.9374 331 0 , 9 3 3 3 0.93680 9 0.91308 420 0.9130 0,9097 422 7 0,83352 0 8303 0.8335 333,511 5 0.7830 0.7859 0.78585 Philips 114.6-mm.-dianieter ponder camera, Straumanis mounting, h ( C n K a ) = 1.5418 A . ; X ( C u K a i ) = 1.54050 A . , X(CuKa?) = 1.54434 A. h Relative peak intensities above background from densitometer nieasiirenients.
Refractive Indices, Ware Length, A. Hg 4358 Ilg 5461 Ka 5892 m
and Molecular Refraction, R
rt,
R, Cc.
n LiH 2 0694 f 0 0005 2 0002 It 0 0005 1 9847 i 0 0005 1 900
LiH
LiD
2 2 1 1
0659 i 0 0005 0010 0 0005 9856 0 0005 905
+
+
5 5 5 4
-
LiD 5 287 5 073 5 021 4 73,i
357 127 074 769
Refractive indices for infinite wave lengths have been extrapolated from the linear relation 1/R = a bv2, where v is thp frequency of light vibration. The value of constant a is 0.20968 for lithium hydride and 0.21121 for lithium deuteride, of the ronstant b 0.0004863 X 1 0 - 2 8 for lithium hydride and O.O00466(i X 10- 2* for lithium deuteride.
+
S - R A YDIFFRACTIOX DATA The structure of lithium hydride and lithium deiiteride has k e n
LITERATURE CITED
(1) Zintl, E., Harder, A , , Z.p h y s . Chem. (B)28,478-80 (1935).
I Presrnt a d d r e w Department of Chemistry, Vnivcrsity of Colnrado, B o d (1 I T . C (11 0 .
W O R Kdone under tlie ailspires of the Atomic Energy Commission.
126. Uranium Trichloride, UCI, E U G E N E STARITZKY, The University of California, Los Alamor Scientific Laboratory, Los Alamor, N. M.
u.
trichloride may be prepared by the reaction of liranium with hydrogen chloride a t 250" to 300" C.
RASIUM
CRYSTALMORPHOLOGY System and Class. Hexagonal, hexagonal-dipyramidal. Axial Elements. a : c = 0:5808 (derived from unit cell dimensions). Habit. Preparations examined consisted of crude hexagonal prisms without developed terminations.
X-RAYDIFFRACTIOX DATA The structure of uranium trichloride has been determined by Zac-hariasen (1). The space group is P 63/m (C&). CellDimensions. a. = 7.441 i 0.001 A.; co = 4.322 & 0.007 A , ; cell volume 207.24 A? Zachariasen ( 1 ) reported a0 = 7.143 i 0.003 4.;co = 4.321 =!c 0.003 A. Formula Weights per Cell. 2. Formula Weight. 344.44. Density. 5.520 grams pel cc. (x-ray).
Partial Powder X-Hay Diffraction Pattern of Cranium Trichloride h ki
10.0 11.0 10.1 20.0 11.1
20.121.0, 2 3 . 0 00.2 30.E 21.1, 2 3 . 1 10.2 30.1
d, A., Calcd. 6,444 3.721 3,589 3.222 2,820 2.583 2.436 2.161 2.148 2.122 2.049 1,92313
d, Obsd. 6.39 6.70 3.57 3.21 2.81 2.57 2.43 2 . Ifi 2.14 2.12 2.OJ
hkl 11.2 22.0 20.: 31.0, 3 4 . 0
1/11b
E 7n
20 10 95 20 20 45 100 1R
a Philips 114.6-mm.-dianieter powder camera, Straumanis mounting; X ( C u K a ) = 1.5418 A.
22.L
d , A., Calcd. 1.8687 1.8603 1 ,7947 1,7873 I ,7087 1 ,6516 1.6165
d , A.& Obsd. 1.861 1,858
1/11b
... 1,787 ...
1.651 3 1 . 1 , 3?.1 21.2, 23.2 1.615 1.0110 40.0 30.2 1,5234 1:521 40. 1 ,50915 1.508 1.478 32.0, 3 5 . 0 1,4784 1.406 1.4098 22.2 b Relative peak intensities above background from densitometer nients.
1055
20 20
..
14
..
30 15
36 5 10 35 measure-
