quasiharmonic thermodynamic properties of minerals renata m. m. wentzcovitch department of chemical...
TRANSCRIPT
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Quasiharmonic Thermodynamic Properties of Minerals
Renata M. M. Wentzcovitch
Department of Chemical Engineering and Materials Science Minnesota Supercomputer Institute U. of Minnesota • Motivation
• First Principles Thermodynamic Method How reliable is it?
• Examples MgSiO3- Ilmenite to perovskite phase transition Thermoelasticity of perovskite Crystal structures at high (P,T)
• Summary
•
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The Contribution from Seismology
VP K
4
3G
VS G
Longitudinal (P) waves
Transverse (S) wave
from free oscillations
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“660 km” topographyJ. M. Kendall, 2000
Seismic Discontinuities and Phase Transitions
PREM Dziewonski and Anderson, 1981
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Methods
• Local Density Approximation
• Soft norm-conserving pseudopotentials
• Born-Oppenheimer variable cell shape molecular dynamics
• Density functional perturbation theory for phonons
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Thermodynamic Method
qj B
qjB
qj
qj
Tk
VTk
VVUTVF
)(exp1ln
2
)()(),(
• VDoS and F(T,V) within the QHA
PVTSFG TV
FP
VT
FS
N-th (N=3,4,5…) order isothermal (eulerian or logarithm) finite strain EoS
IMPORTANT: structural parameters and phonon frequencies depend on volume alone!!….
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equilibrium structure
i
re-optimize
(Thermo) Elastic constant tensor
ji
Tij
GPTc
2
),(
V
jiTij
Sij C
VTPTcPTc
),(),(
Tii
S
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Zero Point Motion Effect
Volume (Å3)
F (
Ry)
MgO
Static 300K Exp (Fei 1999)V (Å3) 18.5 18.8 18.7K (GPa) 169 159 160K´ 4.18 4.30 4.15K´´(GPa-1) -0.025 -0.030
-
-
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Elasticity of MgO
(Karki et al., Science 1999)
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MgSiO3-Akimotoite to perovskite transition
From Fukao et al., Rev. Geophys. (2001)
dS
dV
dP
dT
Clapeyron equation:
00 dP
dTdS
P
T
Tc
Pc
Ak
Pv
T<Tc
P>Pc
Akimotoite bearing slab
Transformation inhibited in cold regions!!
23 GPa1980 K
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MgSiO3-ilmenite (Akimotoite)
Si2O3 layer
Mg2O3 layer1.77 A < Si-O < 1.83 A
1.99 A < Mg-O < 2.16 A
oo
o o
corundum
ilmenite
LiNbO3
Mg Si
Al
SiMgR3
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MgSiO3-perovskite (Pbnm)
SiO3 octahedra
1.78 A < Si-O < 1.80 A
2.01 A < Mg-O < 3.12 Ao o
o o
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Phonon dispersion of MgSiO3-ilmenite and perovskite
Calc Exp
Calc Exp
Pv: Raman [Durben and Wolf 1992] Infrared [Lu et al. 1994]
0 GPa
Calc Exp
Aaaaa
Aaaaaaa
Ak: Raman [Reynard and Rubie, 1996] Infrared [Madon and Price, 1989]
Octahedraldeformation
Octahedraldeformation
Mg displacement
Mg displacement
Octahedral rotation
NEW!
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30
25
20
15
10
5
0
Pre
ssur
e (G
Pa)
2000150010005000
Temperature (K)
akimotoite
perovskite
MgSiO3
Theory
Experiment
Static
Pre
ssur
e (G
Pa)
Temperature (K)
MgSiO3
akimotoite
perovskiteStatic
Experiment
Theory
Thermodynamic phase boundary
Issue I: Change in PT after inclusion of zero point motion energy (Ezp)
Issue II: discrepancy between theory and experiments
Exp:Ito & Takahashi (1996)
Gil(P,T) X Gpv(P,T)
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“…Useful rule…”
•Issue I
ix
iB
xB i
i
e
xkekTVS
11ln),(
00 zpEdP
dT
dV
dSPc decreases
F(V
,T)
V
pv
ak
Ezp shiftsPc
Tkx
B
ii
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30
25
20
15
10
5
0
Pre
ssur
e (G
Pa)
2000150010005000
Temperature (K)
akimotoite
perovskite
MgSiO3
Theory
Experiment
Static
Pre
ssur
e (G
Pa)
Temperature (K)
MgSiO3
akimotoite
perovskiteStatic
Experiment
Theory
Thermodynamic phase boundary
Issue I: Change in PT after inclusion of zero point motion energy (Ezp)
Issue II: discrepancy between theory and experiments
Exp:Ito & Takahashi (1996)
Gil(P,T) X Gpv(P,T)
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…a posteriori criterion for the validity of the QHA
(
10-5 K
-1)
MgSiO3
Karki et al, GRL (2001)
Issue II…
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30
25
20
15
10
5
0
Pre
ssur
e (G
Pa)
2000150010005000
Temperature (K)
akimotoite
perovskite
MgSiO3
Theory
Experiment
Static
Pre
ssur
e (G
Pa)
Temperature (K)
MgSiO3
akimotoite
Static
Experiment
Theory
Exp:Ito & Takahashi (1996)
perovskite
Not OK!!
QHA OK
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Properties of MgSiO3-perovskite and -ilmenite
(gr/cm-3)
V (A3)
KT
(GPa) d KT/dP d KT
2/dP2
(GPa-1) d KT/dT (Gpa K-1)
10-5 K-1
3.580 18.80 159 4.30 -0.030 -0.014 3.12 Calc. MW
3.601 18.69 160 4.15 ~ -0.0145 3.13 Exp. MW
4.210 164.1 247 4.0 -0.016 -0.031 2.1 Calc. Pv
4.247 162.3 246 | 266
3.7 | 4.0
~ -0.02 | -0.07
1.7 | 2.2
Exp. Pv
Exp.: [Ross & Hazen, 1989; Mao et al., 1991; Wang et al., 1994; Funamori et al., 1996; Chopelas, 1996; Gillet et al., 2000; Fiquet et al., 2000; Weidner & Ito, 1985; Reynard& Rubie, 1996; Hofmeister and Ito, 1992; Chopelas, 1999]
Ak
Ak
1.88
1.67 |2.44
-0.025
~
-0.042
4.8
4.7201
212
176.8
175.2
3.908
3.943
Pv
Pv
(256)
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Ad hoc correction to DFT results…
GPaGPaLDA VV 0
exp0 %1.1
0exp
GPaV
V GPaGPaLDA VV 0
exp5.2
(perovskite)
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Ad hoc correction to DFT results…
GPaGPaLDA VV 0
exp0
GPaGPaLDA KK 0
exp0
%1.10
exp
GPaV
V GPaGPaLDA VV 0
exp5.2
GPaGPaLDA KGPaK 0
exp5.2 257 !!!...
(perovskite)
but…
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Ad hoc correction to DFT results…
GPaGPaLDA VV 0
exp0
GPaGPaLDA KK 0
exp0
%1.10
exp
GPaV
V GPaGPaLDA VV 0
exp5.2
GPaGPaLDA KGPaK 0
exp5.2 257 !!!...
)()( exp VKVKLDA ?!
(perovskite)
but…
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Ad hoc correction to DFT results…
GPaGPaLDA VV 0
exp0
GPaGPaLDA KK 0
exp0
%1.10
exp
GPaV
V GPaGPaLDA VV 0
exp5.2
GPaGPaLDA KGPaK 0
exp5.2 257 !!!...
)()( exp VKVKLDA ?!
CVPVPLDA )()( exp
(perovskite)
but…
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EoS for Perovskite
C = 2.5 GPa
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EoS for Ilmenite
C = 1.9 GPa Exp.:Reynard et al., 1996
Calc.:Karki & Wentzcovitch, 2002.
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Ad hoc correction to Pc…
'5.2)()( CVVFVF pvLDA
pvideal
(ilmenite to perovskite)
''9.1)()( CVVFVF ilLDA
ilideal
Pc at 300K should increase
(not really conclusive…!!)
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cij
(Wentzcovitch, Karki, Cococciono, de Gioroncoli, 2003)
300 K1000K2000K3000 K4000 K
(Oganov et al,2001)
Cij(P,T)
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…IMPORTANT: structural parameters and phonon frequencies depend on volume alone!!
• Structures at high P are determined at T= 0
P(V,0)
• P’(V,T’) within the QHA
• At T 0… V(P’,T’)=V(P,0) structure(P’,T’) = structure(P,0)
Corresponding States
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Comparison with Experiments(Ross & Hazen, 1989)
77 K < T < 400K
0 GPa < P < 12 GPa
o
o
o
Calc.
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Comparison with Experiments(Ross & Hazen, 1989)
77 K < T < 400K
0 GPa < P < 12 GPa
o
o
o
Calc.
LDALDA+ZPExp.
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(Funamori et al., 1996)
300 K < T < 2000 K
21 GPa < P < 29 GPa
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(Fiquet et al., 1998)
300 K < T < 2000 K
26 GPa < P < 58 GPa
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Predictions a,b,c(P,T)
4000 K3000 K2000 K1000 K 300 K
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Summary
LDA + QHA is a good and useful FP method for high P,T thermodynamics (..lots of insights)
The validity criterion based on suggests avoidance of phase boundaries
Prediction of high P,T crystal structures through corresponding states
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Acknowledgements
Bijaya B. Karki (LSU)
Stefano de Gironcoli, Stefano Baroni, Matteo Coccocioni (SISSA, Italy)
NSF-EAR and NSF-COMPRES, SISSA and INFM (Italy)