In situ high-pressure high-temperature x-ray diffraction and optical studies have been conducted on solid oxygen between 10 and 20 GPa and up to 700 K. Optical observations and Raman spectroscopic studies have been utilized to confirm the existence of η-O2 and to identify phase behavior and phase boundaries of β-, ϵ- and η-O2 at elevated temperatures. Subsequent single-crystal synchrotron x-ray diffraction studies yielded the structure of the η-O2 phase at 15.9 GPa and 625 K.

1.
D. A.
Young
,
Phase Diagrams of the Elements
(
University of California Press
,
Oxford, England
,
1991
).
2.
H. K.
Mao
and
R. J.
Hemley
,
Rev. Mod. Phys.
66
,
671
(
1994
).
3.
E.
Gregoryanz
,
A. F.
Goncharov
,
C.
Sanloup
,
M.
Somayazulu
,
H. K.
Mao
, and
R. J.
Hemley
,
J. Chem. Phys.
126
,
184505
(
2007
).
4.
Y. A.
Freiman
and
H. J.
Jodl
,
Phys. Rep.
401
,
1
(
2004
).
5.
Y.
Akahama
,
H.
Kawamura
, and
O.
Shimomura
,
Phys. Rev. B
64
,
054105
(
2001
).
6.
T. H.
Jordan
,
W. E.
Streib
,
H. W.
Smith
, and
W. N.
Lipscomb
,
Acta Crystallogr.
17
,
777
(
1964
).
7.
D. T.
Cromer
,
R. L.
Mills
,
D.
Schiferl
, and
L. A.
Schwalbe
,
Acta Crystallogr., Sect. B: Struct. Crystallogr. Cryst. Chem.
37
,
8
(
1981
).
8.
S.
Desgreniers
,
Y. K.
Vohra
, and
A.
Ruoff
,
J. Phys. Chem.
94
,
1117
(
1990
).
9.
K.
Shimizu
,
K.
Suhara
,
M.
Ikumo
,
M. I.
Eremets
, and
K.
Amaya
,
Nature (London)
393
,
767
(
1998
).
10.
D.
Schiferl
,
D. T.
Cromer
, and
R. L.
Mills
,
Acta Crystallogr., Sect. B: Struct. Crystallogr. Cryst. Chem.
37
,
1329
(
1981
).
11.
D.
Schiferl
,
D.
Cromer
,
L. A.
Schwalbe
, and
R. L.
Mills
,
Acta Crystallogr., Sect. B: Struct. Sci.
39
,
153
(
1983
).
12.
B.
Olinger
,
R. L.
Mills
, and
R. B.
Roof
, Jr.
,
J. Chem. Phys.
81
,
5068
(
1984
).
13.
S. W.
Johnson
,
M.
Nicol
, and
D.
Schiferl
,
J. Appl. Crystallogr.
26
,
320
(
1993
).
14.
L. F.
Lundegaard
, Ph.D. thesis,
University of Edinburgh
,
2008
.
15.
L. F.
Lundegaard
,
G.
Weck
,
M. I.
McMahon
,
S.
Desgreniers
, and
P.
Loubeyre
,
Nature (London)
443
,
201
(
2006
).
16.
H.
Fujihisa
,
Y.
Akahama
,
H.
Kawamura
,
Y.
Ohishi
,
O.
Shimomura
,
H.
Yamawaki
,
M.
Sakashita
,
Y.
Gotoh
,
S.
Takeya
, and
K.
Honda
,
Phys. Rev. Lett.
97
,
085503
(
2006
).
17.
A. F.
Goncharov
,
E.
Gregoryanz
,
R. J.
Hemley
, and
H. K.
Mao
,
Phys. Rev. B
68
,
100102
(
2003
).
18.
D. A.
Young
,
C. -S.
Zha
,
R.
Boehler
,
J.
Yen
,
M.
Nicol
,
A. S.
Zinn
,
D.
Schiferl
,
S.
Kinkead
,
R. C.
Hanson
, and
D. A.
Pinnick
,
Phys. Rev. B
35
,
5353
(
1987
).
19.
J.
Yen
and
M.
Nicol
,
J. Phys. Chem.
91
,
3336
(
1987
).
20.
M.
Santoro
,
E.
Gregoryanz
,
H. K.
Mao
, and
R. J.
Hemley
,
Phys. Rev. Lett.
93
,
265701
(
2004
).
21.
G.
Weck
,
P.
Loubeyre
,
J. H.
Eggert
,
M.
Mezouar
, and
M.
Hanfland
,
Phys. Rev. B
76
,
054121
(
2007
).
22.
A. F.
Goncharov
,
P.
Beck
,
V. V.
Struzhkin
,
R. J.
Hemley
, and
J. C.
Crowhurst
,
J. Phys. Chem. Solids
69
,
2217
(
2008
).
23.
G.
Weck
,
Oral Presentation, European High-Pressure Research Group (EHPRG) Conference
, Valencia, Spain,
2008
(unpublished).
24.
E.
Gregoryanz
,
L. F.
Lundegaard
,
M. I.
McMahon
,
C.
Guillaume
,
R. J.
Nelmes
, and
M.
Mezouar
,
Science
320
,
1054
(
2008
).
25.
R.
Boehler
and
K.
De Hantsetters
,
High Press. Res.
24
,
391
(
2004
).
26.
M.
Hanfland
,
K.
Syassen
, and
J.
Köhler
,
J. Appl. Phys.
91
,
4143
(
2002
).
27.
A.
Goncharov
and
V.
Struzhkin
,
J. Raman Spectrosc.
34
,
532
(
2003
).
28.
SMART, SAINT, ASTRO, and XPREP, data collection and processing software for the SMART system, Bruker Analytical X-ray Systems, Inc., Madison, Wisconsin,
1995
.
29.
E.
Uemura
,
Y.
Akahama
,
H.
Kawamura
,
T.
Le Bihan
,
T.
Shobu
,
Y.
Noda
, and
O.
Shimomura
,
J. Phys.: Condens. Matter
14
,
10423
(
2002
).
30.
SHELXL-97, a program for single crystal structure refinement,
G. M.
Sheldrick
, University of Göttingen,
1997
.
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