chapter 10 physics of highly compressed matter. 9.1 equation of state of matter in high pressure
TRANSCRIPT
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Chapter 10 Physics of Highly Compressed Matter
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9.1 Equation of State of Matter in High Pressure
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1. The pressure is equal to zero at the solid density and the experimental bulk modulus is reproduced.
2. The cold pressure at the density less than the solid density should be negative (tensile force).
3. The Fermi pressure of electron is reproduced to be a dominant term at high density in the limit of eF >> Te, when eF is the Fermi energy of electron.
4. The ideal gas EOS should be reproduced at high temperature Te >> eF .
5. The effective charge Z* is determined not only by the thermal ionization, but also by the pressure ionization.
More’s QEOS
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F Fi , Ti Fe ,Te Fb
e Fe TeFe
Te
Pe 2 Fe
Se
Fe
Te
Pi
i
Ti
Pi
Ti
Formula of Equation of State Applicable to Wide Range of T and n
Total Free Energy
Thermodynamic Consistency
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1. 0 < Ti < D (low-temperature solid phase)2. D < Ti < Tm (high-temperature solid phase)3. Tm < Ti (fluid phase)
Ion Equation of State (Cowan Model by More)
w Tm / Ti
i 3
2
Ti
Amp1w1/ 3
Pi Ti
Amp1Fw1/ 3
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Pi 3sTi
Amp
Tm 0.322 b
10
3 / 1 4 (eV)
b 0.6Z1/ 9
/refref A / 9Z0.3 g / cm3
s b 2 / 1 F 3s 1
Melting Temperature
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Electron Equation of State based on Thomas-Fermi Model
H
AZ, Te
H Te
Z4 / 3
Z* Z Z*,H
Pe Z10 / 3PeH e
Z7 / 3
Ae
H
Z*,H Z0*, H Zth
*,H
PeH Pe,0
H Pe,thH
eH e ,0
H e,thH
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Z0*,H
1
Pe,0H 0.41 Z0
*,H 5/ 3Mbar
e,0H 4.2 1012 2 6 9
1 2 /3 U0 erg / g
H /0 1/ 2
0 0.148 g / cm 3
e,0H
1
2 Pe,0H d
Thomas Fermi ModelTakabe-Takami model,
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Z th*,H 1 Z0
*,H Y
Pe,thH Z*,H 2
F
H H
mp
e,thH Z*,H
3
22
F
H
mp
Y 1/ 1 T0H / Te
H 1/ 2
T0H 0.0327exp 6.98 H 0.075
eV
F
H 3
5
2
2m
32
mp
2 / 3
H 2 / 315.58 H 2 / 3eV
rH is in the unit of g/cm3
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Te
H
FH
1
2.25H 0.1545
1.23
Pe,thH Z*,H H
mpTe
H
e,thH
3
2
Z*,H
mpTe
H for 1
Pe,thH
Z0*,H
H
mp
TeH 2F
H
e,thH
3
2
Z0*,H 1
mp
TeH 2F
H for 1
Pe,thH e
He ,thH
varies from Ge = 2/3 for >> 1x to Ge = 2/3 g (= 0.821) for x << 1.
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Bonding Correction
Pb Pb0s
2 / 3
exp b 1 R
Rs
b b0 1 exp b 1 R
Rs
B P
at s , Te 0
where Pb0 = eb0brs/3, rs the solid density, R/Rs = (rs / r)1/3. The parameters eb0 and b are determined so that the total pressure is equal to zero at = r rs and Te = 0 and the bulk modulus defined by
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P
BBulk Modulus
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Equation of State of DD
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Image of Atoms in Hot-Dense Plasmas(Pressure Ionization)
10.2 Atomic Physics of Hot Dense Plasam
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En IHZn
n
2
En0
Z n Z n,mPm 1
2mn n,nPn
En0
1
2
e2
rnn,n Pn
e2Pm
rmmn m,n
rn =a0n2 / Zn
Eion
PnEn
Eion IHn Zn / n 2
Average Atom ModelScreened Hydrogen Model
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Pn gn 1 expEn
Te
1
Z*
1
2 2ni
2meTe
2
3/ 2
I1/ 2Te
I1/ 2 x y1/ 2
1 exp x y 0 dy
Z Z* Pnn
0 n i
m,m'm,m' m,m'
n im,m' n ixm 1 xm'
photo excitation cross-section sm,m'
∫fm,m'ndn = 1
xn = Pn / gn
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10.3 Equation of State Experiments and Planetary Physics
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Equation of StateGiant Planet
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