Solid N2 was studied by energy‐dispersive x‐ray diffraction between 5.75 and 43.9 GPa at room temperature. The transition from δ‐N2 (Pm3n) to ε‐N2 (Rc) was observed at 16.3±0.5 GPa. The pressure‐volume curves for both phases were determined. A comparison with the results of apriori calculations shows good agreement up to ∼12 GPa, however, at higher pressures the theoretical isotherm becomes increasingly stiffer.

1.
J. A.
Venables
and
C. A.
English
,
Acta Cryst. B
30
,
929
(
1974
).
2.
D.
Schiferl
,
D. T.
Cromer
,
R. R.
Ryan
,
A. C.
Larson
,
R.
Lesar
, and
R. L.
Mills
,
Acta Cryst. C
39
,
1151
(
1983
).
3.
W. E.
Streib
,
T. H.
Jordan
, and
W. N.
Lipscomb
,
J. Chem. Phys.
37
,
2962
(
1962
).
4.
B. M.
Powell
,
G.
Dolling
, and
H. F.
Nieman
,
J. Chem. Phys.
79
,
982
(
1983
).
5.
R. L.
Mills
and
A. F.
Schuch
,
Phys. Rev. Lett.
23
,
1154
(
1969
).
6.
A. F.
Schuch
and
R. L.
Mills
,
J. Chem. Phys.
52
,
6000
(
1970
).
7.
R.
Lesar
,
S. A.
Ekberg
,
L. H.
Jones
,
R. L.
Mills
,
L. A.
Schwalbe
, and
D.
Schiferl
,
Solid State Commun.
32
,
131
(
1979
).
8.
D. T.
Cromer
,
R. L.
Mills
,
D.
Schiferl
, and
L. A.
Schwalbe
,
Acta Cryst. B
37
,
8
(
1981
).
9.
B.
Olinger
,
J. Chem. Phys.
80
,
1309
(
1984
).
10.
D.
Schiferl
,
S.
Buchsbaum
, and
R. L.
Mills
,
J. Phys. Chem.
89
,
2324
(
1985
).
11.
R. L.
Mills
,
B.
Olinger
, and
D. T.
Cromer
,
J. Chem. Phys.
84
,
2837
(
1986
).
12.
R.
Reichlin
,
D.
Schiferl
,
Sue
Martin
,
C.
Vanderborgh
, and
R. L.
Mills
,
Phys. Rev. Lett.
55
,
1464
(
1985
).
13.
R. D.
Etters
,
V.
Chandrasekharan
,
E.
Uzan
, and
K.
Kobashi
,
Phys. Rev. B
33
,
8615
(
1986
).
14.
R.
Lesar
,
J. Chem. Phys.
81
,
5104
(
1984
).
15.
S.
Nosé
and
M. L.
Klein
,
Phys. Rev. B
33
,
339
(
1986
).
16.
A. P.
Jephcoat
,
R. J.
Hemley
,
H. K.
Mao
, and
D. E.
Cox
,
Bull. Am. Phys. Soc.
33
,
522
(
1988
).
17.
G.
Huber
,
K.
Syassen
, and
W. B.
Holzapfel
,
Phys. Rev. B
15
,
5123
(
1977
).
18.
R. A.
Forman
,
G. J.
Piermarini
,
J. D.
Barnett
, and
S.
Block
,
Science
176
,
284
(
1972
).
19.
G. J.
Piermarini
,
S.
Block
,
J. D.
Bamett
, and
R. A.
Forman
,
J. Appl. Phys.
46
,
2774
(
1975
).
20.
P. G.
Johannsen
,
W.
Helle
, and
W. B.
Holzapfel
,
J. Phys. (Paris) C
8
,
199
(
1984
).
21.
W. B.
Holzapfel
,
Revue Phys. Appl.
19
,
705
(
1984
).
22.
B.
Olinger
and
P. M.
Halleck
,
J. Chem. Phys.
62
,
94
(
1975
).
23.
B.
Olinger
,
P. M.
Halleck
, and
H. H.
Cady
,
J. Chem. Phys.
62
,
4480
(
1975
).
24.
M.
Grimsditch
,
Phys. Rev. B
32
,
514
(
1985
).
25.
A. S.
Zinn
,
D.
Schiferl
, and
M.
Nicol
,
J. Chem. Phys.
87
,
1267
(
1987
).
26.
W. L.
Vos
and
J. A.
Schouten
,
J. Chem. Phys.
91
,
6302
(
1989
).
27.
B. J.
Baer
and
M.
Nicol
,
High Pressure Res.
4
,
511
(
1990
).
28.
H. Schneider, W. Häfner, A. Wokaun, and H. Olijnyk (to be published, 1991).
29.
F. D.
Medina
and
W. B.
Daniels
,
J. Chem. Phys.
64
,
150
(
1976
).
30.
T. A.
Scott
,
Phys. Rep.
27
,
89
(
1976
).
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