Pressure-induced physical and chemical transformations of sodium cyanide (NaCN) have been studied up to 50 GPa in diamond-anvil cells, using micro-Raman spectroscopy and angle-resolved synchrotron x-ray diffraction. We observe three phase transitions in this pressure range: NaCN-IIA (orthorhombic, ), to NaCN-IIB (orthorhombic, ) at 4 GPa, to NaCN-III (monoclinic, ) at 8 GPa, and to NaCN-IV (tetragonal, ) at 15 GPa, which is stable to 25 GPa. At higher pressures, NaCN-IV undergoes an irreversible chemical change, which occurs over a large pressure range between 25 and 34 GPa. The new material exhibits a broad yet strong Raman band at around , indicating the formation of bonds in a similar configuration of carbon graphite. The absence of sharp diffraction lines in this material suggests an amorphous nature of CN polymer products.
REFERENCES
1.
N.
Elliott
and J.
Hastings
, Acta Crystallogr.
14
, 1018
(1961
).2.
W.
Dultz
and H.
Krause
, Phys. Rev. B
18
, 394
(1978
).3.
D. L.
Decker
, R. A.
Beyerlein
, G.
Roult
, and T. G.
Worlton
, Phys. Rev. B
10
, 3584
(1974
).4.
W.
Dultz
, H. H.
Otto
, H.
Krause
, and J. L.
Buevoz
, Phys. Rev. B
24
, 1287
(1981
).5.
H. T.
Stokes
, D. L.
Decker
, H. M.
Nelson
, and J. D.
Jorgensen
, Phys. Rev. B
47
, 11082
(1993
).6.
J. W.
Heckathorn
, M. B.
Kruger
, D.
Gerlich
, and R.
Jeanloz
, Phys. Rev. B
60
, 979
(1999
).7.
J. M.
Rowe
, J. J.
Rush
, and F.
Luty
, Phys. Rev. B
29
, 2168
(1984
).8.
K.
Strössner
, H. D.
Hochheimer
, W.
Hönie
, and W.
Werner
, J. Chem. Phys.
83
, 2435
(1985
).9.
C. E.
Messer
and W. T.
Ziegler
, J. Am. Chem. Soc.
63
, 2703
(1941
).10.
T.
Schrader
, A.
Loidl
, and T.
Vogt
, Phys. Rev. B
39
, 6186
(1989
).11.
T.
Schrader
, A.
Loidl
, and T.
Vogt
, Z. Phys. B: Condens. Matter
79
, 423
(1990
).12.
M.
Sugisaki
, T.
Matsuo
, and H.
Suga
, Bull. Chem. Soc. Jpn.
41
, 1747
(1968
).13.
M.
Rivers
, V. B.
Prakapenka
, A.
Kubo
, C.
Pullins
, C. M.
Holl
, and S. D.
Jacobsen
, High Press. Res.
28
, 273
(2008
).14.
K.
Mao
, J.
Xu
, and P. M.
Bell
, J. Geophys. Res.
91
, 4673
, doi:10.1029/JB091iB05p04673 (1986
).15.
A. P.
Hemmersley
, ESRF Report No. 98HA01T, FIT2D V9.129 Reference Manual V3.1, 1998
.16.
S.
Desgreniers
and K.
Lagarec
, J. Appl. Crystallogr.
27
, 432
(1994
);Also, other related x-ray softwares obtained from CCP14 web sites (see, http://ccp14.sims.nrc.ca/mirror/mirror.htm).
17.
S.
Reich
and C.
Thomsen
, Philos. Trans. R. Soc. London, Ser. A
362
, 2271
(2004
).18.
T. L.
Schindler
and Y. K.
Vohra
, J. Phys.: Condens. Matter
7
, L637
(1995
).19.
M.
Hanfland
, H.
Beister
, and K.
Syassen
, Phys. Rev. B
39
, 12598
(1989
).20.
L. A.
Leitas
and S. S.
Bukalov
, J. Raman Spectrosc.
34
, 413
(2001
).21.
M.
Rumi
, G.
Zerbi
, K.
Mullen
, G.
Muller
, and M.
Rehahn
, J. Chem. Phys.
106
, 24
(1997
).22.
J. D.
Dunitz
, X-Ray Analysis and the Structure of Organic Molecules
(Cornell University Press
, Itaca
, 1979
), p. 43
.23.
D.
Tabor
, Gases, Liquids, and Solids: And Other States of Matter
(Cambridge University Press
, Cambridge
, 1991
), p. 782
.24.
H. T.
Stokes
, D. C.
Ailion
, and T. A.
Case
, Phys. Rev. B
30
, 4925
(1984
).25.
P.
Preu
and S.
Haussuhl
, J. Phys. Chem. Solids
46
, 265
(1985
).26.
H. T.
Stokes
and R. D.
Swinney
, Phys. Rev. B
31
, 7133
(1985
).27.
A.
Buljan
, P.
Alemany
, and E.
Ruiz
, J. Phys. Chem. A
101
, 1393
(1997
).28.
R.
LeSar
and R. G.
Gordon
, J. Chem. Phys.
77
, 3682
(1982
).29.
D. M.
Clatterbuck
, D. C.
Chrzan
, and J. W.
Morris
, Jr., Acta Mater.
51
, 2271
(2003
).30.
M. S.
Dresselhaus
and G.
Dresselhaus
, Adv. Phys.
30
, 139
(1981
);M. S.
Dresselhaus
and G.
Dresselhaus
, Adv. Phys.
51
, 1
(2002
).31.
S. A.
Solin
and N.
Caswell
, J. Raman Spectrosc.
10
, 129
(1981
).32.
L.
Zhenxian
, W. L.
Zhao
, Y. C.
Qilang
, and Z.
Guangtian
, J. Phys. Condens. Matter
2
, 8083
(1990
).33.
Y. X.
Zhao
and I. L.
Spain
, Phys. Rev. B
40
, 993
(1989
).34.
L.
Ciabini
, M.
Santoro
, F. A.
Gorelli
, R.
Bini
, V.
Schettino
, and S.
Raugei
, Nature Mater.
6
, 39
(2007
).35.
C. S.
Yoo
and M.
Nicol
, J. Phys. Chem.
90
, 6726
(1986
);C. S.
Yoo
and M.
Nicol
, J. Phys. Chem.
90
, 6732
(1986
).36.
A. Y.
Liu
and R. M.
Wentzcovitch
, Phys. Rev. B
50
, 10362
(1994
).37.
M.
Terrones
, D.
Golberg
, N.
Grobert
, T.
Seeger
, M.
Reyes-Reyes
, M.
Mayne
, R.
Kamalakaran
, P.
Dorozhkin
, Z. -C.
Dong
, H.
Terrones
, M.
Rühle
, and Y.
Bando
, Adv. Mater. (Weinheim, Ger.)
15
, 1899
(2003
).© 2009 American Institute of Physics.
2009
American Institute of Physics
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