Evidence for a Phase Transition in Silicate Melt at Extreme Pressure and Temperature Conditions

D. K. Spaulding; R. S. McWilliams; R. Jeanloz; J. H. Eggert; P. M. Celliers; D. G. Hicks; G. W. Collins; R. F. Smith

doi:10.1103/PhysRevLett.108.065701

Evidence for a Phase Transition in Silicate Melt at Extreme Pressure and Temperature Conditions

D. K. Spaulding^*, R. S. McWilliams, R. Jeanloz, J. H. Eggert, P. M. Celliers, D. G. Hicks, G. W. Collins, R. F. Smith

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

Laser-driven shock compression experiments reveal the presence of a phase transition in MgSiO3 over the pressure-temperature range 300-400 GPa and 10 000-16 000 K, with a positive Clapeyron slope and a volume change of similar to 6.3 (+/- 2.0) percent. The observations are most readily interpreted as an abrupt liquid-liquid transition in a silicate composition representative of terrestrial planetary mantles, implying potentially significant consequences for the thermal-chemical evolution of extrasolar planetary interiors. In addition, the present results extend the Hugoniot equation of state of MgSiO3 single crystal and glass to 950 GPa.

Original language	English
Article number	065701
Number of pages	4
Journal	Physical Review Letters
Volume	108
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.108.065701
Publication status	Published - 8 Feb 2012

Keywords / Materials (for Non-textual outputs)

LOWER MANTLE
MGSIO3 PEROVSKITE
LIQUID-PHASE
LASER
DIAGNOSTICS
PHOSPHORUS
CONVECTION
STATE

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10.1103/PhysRevLett.108.065701

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title = "Evidence for a Phase Transition in Silicate Melt at Extreme Pressure and Temperature Conditions",

abstract = "Laser-driven shock compression experiments reveal the presence of a phase transition in MgSiO3 over the pressure-temperature range 300-400 GPa and 10 000-16 000 K, with a positive Clapeyron slope and a volume change of similar to 6.3 (+/- 2.0) percent. The observations are most readily interpreted as an abrupt liquid-liquid transition in a silicate composition representative of terrestrial planetary mantles, implying potentially significant consequences for the thermal-chemical evolution of extrasolar planetary interiors. In addition, the present results extend the Hugoniot equation of state of MgSiO3 single crystal and glass to 950 GPa.",

keywords = "LOWER MANTLE, MGSIO3 PEROVSKITE, LIQUID-PHASE, LASER, DIAGNOSTICS, PHOSPHORUS, CONVECTION, STATE",

author = "Spaulding, {D. K.} and McWilliams, {R. S.} and R. Jeanloz and Eggert, {J. H.} and Celliers, {P. M.} and Hicks, {D. G.} and Collins, {G. W.} and Smith, {R. F.}",

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doi = "10.1103/PhysRevLett.108.065701",

language = "English",

volume = "108",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

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TY - JOUR

T1 - Evidence for a Phase Transition in Silicate Melt at Extreme Pressure and Temperature Conditions

AU - Spaulding, D. K.

AU - McWilliams, R. S.

AU - Jeanloz, R.

AU - Eggert, J. H.

AU - Celliers, P. M.

AU - Hicks, D. G.

AU - Collins, G. W.

AU - Smith, R. F.

PY - 2012/2/8

Y1 - 2012/2/8

N2 - Laser-driven shock compression experiments reveal the presence of a phase transition in MgSiO3 over the pressure-temperature range 300-400 GPa and 10 000-16 000 K, with a positive Clapeyron slope and a volume change of similar to 6.3 (+/- 2.0) percent. The observations are most readily interpreted as an abrupt liquid-liquid transition in a silicate composition representative of terrestrial planetary mantles, implying potentially significant consequences for the thermal-chemical evolution of extrasolar planetary interiors. In addition, the present results extend the Hugoniot equation of state of MgSiO3 single crystal and glass to 950 GPa.

AB - Laser-driven shock compression experiments reveal the presence of a phase transition in MgSiO3 over the pressure-temperature range 300-400 GPa and 10 000-16 000 K, with a positive Clapeyron slope and a volume change of similar to 6.3 (+/- 2.0) percent. The observations are most readily interpreted as an abrupt liquid-liquid transition in a silicate composition representative of terrestrial planetary mantles, implying potentially significant consequences for the thermal-chemical evolution of extrasolar planetary interiors. In addition, the present results extend the Hugoniot equation of state of MgSiO3 single crystal and glass to 950 GPa.

KW - LOWER MANTLE

KW - MGSIO3 PEROVSKITE

KW - LIQUID-PHASE

KW - LASER

KW - DIAGNOSTICS

KW - PHOSPHORUS

KW - CONVECTION

KW - STATE

U2 - 10.1103/PhysRevLett.108.065701

DO - 10.1103/PhysRevLett.108.065701

M3 - Article

SN - 0031-9007

VL - 108

JO - Physical Review Letters

JF - Physical Review Letters

IS - 6

M1 - 065701

ER -

Evidence for a Phase Transition in Silicate Melt at Extreme Pressure and Temperature Conditions

Abstract

Keywords / Materials (for Non-textual outputs)

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