Physical and chemical changes of hydrogen peroxide under high pressures
0
10
20
1000
30
1200
40
50
Pressure (GPa)
 H2O2 is a strong oxidizer and even explosive, and is often used as IED
4
a
a
H2O2-II
5
10
15
20
25
30
O2 from H2O2 decomposition
us(O2)
Pure O2
1500
10
-1
Raman Shifts (cm )
1575
1525
(b) downloading
19.6%
9.5%
(c)
60
80
100
3
 Phase transition occurs at lower pressure
for4
diluted samples.
 Oxygen clathrates are observed at low
5
6
concentrated mixtures
 O2
(9.5% H2O2)
D-type
H-type
 O2
(19.6% H2O2)
1520
1540
1560
1580
-1
The presence of water stabilizes the H2O2 mixtures by
forming stronger hydrogen bonds
Detonation in Shocked H2O2
Homogenous detonation model
H2O + ½ O2
H2O2-I
14
1600
20
30
H2O2-II
O2
10
8
1700
40
12
50
H2O
6
0
10
Pressure (GPa)
20
30
40
50
P (GPa)
H2O2 decomposition across the melting at 2.5 GPa
H2O2
O2
H2O
2-Stage gas gun
40
water cage
3
25
19
3 GPa
-O2
Synchrotron x-rays
Characterization
Under Dynamic High Pressure at LANL
20
2
16
44

1
water cage
H2+O2
18

1600
O2 in D-type
20
V (cm /mol)
-1
Raman Shift (cm )
H2O2-II
O2 in H-type
Raman Shifts (cm )
EOS comparison of H2O2, H2O, O2
Decomposition
starts
0
Loading H2O2
40
Chemical Decomposition of Compressed H2O2
1500
H2O2 target with stress gauge
35
 Pure H2O2 is chemically stable to pressures 18 GPa
H2O2-I
*
decomposition
CH2O2 (mole %)
 It accompanies a volume collapse of ~ 8.6%
1700
2
0
 Phase transition at 13 GPa from H2O2-I to -II, based on Raman and x-ray data
Under Static High Pressure at WSU
melting
0
Pressure (GPa)
Experimental Approach
90
O2 hydrate clathrates
14
0
Mitigating chemical and shock threats of H2O2 requires understanding
of the stability of H2O2-H2O mixtures at relevant thermal conditions
70
1
Ref: J.Y. Chen and C.S. Yoo, J. Chem. Phys. 132, 214501 (2010)
 Behaviors of highly concentrated H2O2 are not known under static high pressures
3
V=8.6%
 Shock-induced detonation of concentrated H2O2 has been observed at ~13-15 GPa
Confocal micro-Raman
Phase mapping
b
6
12
 Stability and behavior of H2O2 and water mixtures are not known
Diamond anvil cell
Pressurizing
4
c
16
V (cm /mol)
800
orthorhombic
50
H2O2-I
5
3 GPa
880
tetragonal
c
25
16
920
H2O2-II
30
3.3 GPa
8
H2O2-I
10
Intensity (a.u.)
960
10
5
CH2O2 (wt %)
2.6 GPa
44
40
35
32
Lattice Parameters (A)
0
1000
3
-1
Raman Shift (cm )
Transition H O -II
2 2
Zone
H2O2-I
1040
Structural Evidence
(a)
Raman Spectral Evidence
Ref: H. Cynn, S.A. Sheffield & C.S. Yoo, J Chem. Phys. 110, 1999, 6836-6843
Behaviors of Binary Mixtures: H2O + H2O2
1550
Phase Transitions in H2O2
P (GPa)
Motivations and Objectives
9.5%
19.6%
Jing-Yin Chen and Choong-Shik Yoo (PI)
Washington State University, Pullman, Washington 99164
Decomposition of H2O2 is driven by densification and melting
 98 % H2O2 detonates at 6.7 Km/s (13-15 GPa).
 It seems to follow homogenous detonation model based on the spatially
resolved wave profile measurement
 The work has been done in collaboration with D. Dattelbaum and S.
Sheffield In LANL
Is shock-induced detonation different from the static
pressure-induced decomposition ?
The work has been supported by the US DHS under the grant number 2008-ST-061-ED0001. For details, please contact [email protected] or [email protected]