DOI: 10.1126/science.249.4974.1275. Negative Pressure-Temperature Slopes for Reactions Formign MgSiO <sub>3</sub> Perovskite from Calorimetry

Negative Pressure-Temperature Slopes for Reactions Formign MgSiO 3 Perovskite from Calorimetry

10.1126/science.249.4974.1275

Crossref journal-article

American Association for the Advancement of Science (AAAS)

Science (221)

Abstract

A new and sensitive differential drop solution calorimetric technique was developed for very small samples. A single experiment using one 5.18-milligram sample of perovskite, synthesized at 25 gigapascals and 1873 Kelvin, gave 110.1 ± 4.1 kilojoules per mole for the enthalpy of the ilmenite-perovskite transition in MgSiO 3 . The thermodynamics of the reaction of MgSiO 3 (ilmenite) to MgSiO 3 (perovskite) and of Mg 2 SiO 4 (spinel) to MgSiO 3 (perovskite) and MgO (periclase) were assessed. Despite uncertainties in heat capacity and molar volume at high pressure and temperature, both reactions clearly have negative pressure-temperature slopes, -0.005 ± 0.002 and -0.004 ± 0.002 gigapascals per Kelvin, respectively. The latter may be insufficiently negative to preclude whole-mantle convection.

Bibliography

Ito, E., Akaogi, M., Topor, L., & Navrotsky, A. (1990). Negative Pressure-Temperature Slopes for Reactions Formign MgSiO 3 Perovskite from Calorimetry. Science, 249(4974), 1275â1278.

Authors 4

E. Ito (first)
M. Akaogi (additional)
L. Topor (additional)
A. Navrotsky (additional)

References 23 Referenced 174

AKAOGI, M, OLIVINE-MODIFIED SPINEL-SPINEL TRANSITIONS IN THE SYSTEM MG2SIO4-FE2SIO4 - CALORIMETRIC MEASUREMENTS, THERMOCHEMICAL CALCULATION, AND GEOPHYSICAL APPLICATION, JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS 94: 15671 (1989). (10.1029/JB094iB11p15671) / JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS (1989)
ASHIDA, T, MGSIO3 ILMENITE - HEAT-CAPACITY, THERMAL EXPANSIVITY, AND ENTHALPY OF TRANSFORMATION, PHYSICS AND CHEMISTRY OF MINERALS 16: 239 (1988). / PHYSICS AND CHEMISTRY OF MINERALS (1988)
CHARLU, T.V., ENTHALPIES OF FORMATION AT 970 K OF COMPOUNDS IN SYSTEM MGO-AL2O3-SIO2 FROM HIGH-TEMPERATURE SOLUTION CALORIMETRY, GEOCHIMICA ET COSMOCHIMICA ACTA 39: 1487 (1975). (10.1016/0016-7037(75)90150-7) / GEOCHIMICA ET COSMOCHIMICA ACTA (1975)
CHRISTENSEN, U.R., THE INTERACTION OF A SUBDUCTING LITHOSPHERIC SLAB WITH A CHEMICAL OR PHASE-BOUNDARY, JOURNAL OF GEOPHYSICAL RESEARCH 89: 4389 (1984). (10.1029/JB089iB06p04389) / JOURNAL OF GEOPHYSICAL RESEARCH (1984)
FEI, Y, INTERNALLY CONSISTENT THERMODYNAMIC DATA AND EQUILIBRIUM PHASE-RELATIONS FOR COMPOUNDS IN THE SYSTEM MGO-SIO2 AT HIGH-PRESSURE AND HIGH-PRESSURE AND HIGH-TEMPERATURE, JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS 95: 6915 (1990). (10.1029/JB095iB05p06915) / JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS (1990)
ITO, E, THE MINERALOGY AND CHEMISTRY OF THE LOWER MANTLE - AN IMPLICATION OF THE ULTRAHIGH-PRESSURE PHASE-RELATIONS IN THE SYSTEM MGO-FEO-SIO2, EARTH AND PLANETARY SCIENCE LETTERS 67: 238 (1984). (10.1016/0012-821X(84)90119-5) / EARTH AND PLANETARY SCIENCE LETTERS (1984)
Ito, E, High-Pressure Research in GeophysicsL 405 (1982). / High-Pressure Research in Geophysics (1982)
ITO, E, POSTSPINEL TRANSFORMATIONS IN THE SYSTEM MG2SIO4-FE2SIO4 AND SOME GEOPHYSICAL IMPLICATIONS, JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS 94: 10637 (1989). (10.1029/JB094iB08p10637) / JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS (1989)
JACKSON, I, SOME GEOPHYSICAL CONSTRAINTS ON THE CHEMICAL-COMPOSITION OF THE EARTHS LOWER MANTLE, EARTH AND PLANETARY SCIENCE LETTERS 62: 91 (1983). (10.1016/0012-821X(83)90073-0) / EARTH AND PLANETARY SCIENCE LETTERS (1983)
KNITTLE, E, THERMAL-EXPANSION OF SILICATE PEROVSKITE AND STRATIFICATION OF THE EARTHS MANTLE, NATURE 319: 214 (1986). (10.1038/319214a0) / NATURE (1986)
Navrotsky, A., High-Pressure Research in Mineral Physics: 261 (1987). / High-Pressure Research in Mineral Physics (1987)
NAVROTSKY, A, PEROVSKITE STRUCTURE: 67 (1989). / PEROVSKITE STRUCTURE (1989)
NAVROTSKY, A, PROGRESS AND NEW DIRECTIONS IN HIGH-TEMPERATURE CALORIMETRY, PHYSICS AND CHEMISTRY OF MINERALS 2: 89 (1977). (10.1007/BF00307526) / PHYSICS AND CHEMISTRY OF MINERALS (1977)
NAVROTSKY, A, CALORIMETRIC STUDY OF THE STABILITY OF HIGH-PRESSURE PHASES IN THE SYSTEMS COO-SIO2 AND FEO-SIO2, AND CALCULATION OF PHASE-DIAGRAMS IN MO-SIO2 SYSTEMS, PHYSICS OF THE EARTH AND PLANETARY INTERIORS 19: 275 (1979). (10.1016/0031-9201(79)90001-3) / PHYSICS OF THE EARTH AND PLANETARY INTERIORS (1979)
NAVROTSKY, A, HIGH-PRESSURE TRANSITIONS IN SILICATES, PROGRESS IN SOLID STATE CHEMISTRY 17: 53 (1987). (10.1016/0079-6786(87)90001-X) / PROGRESS IN SOLID STATE CHEMISTRY (1987)
ROSS, N.L., SINGLE-CRYSTAL X-RAY-DIFFRACTION STUDY OF MGSIO3 PEROVSKITE FROM 77-K TO 400-K, PHYSICS AND CHEMISTRY OF MINERALS 16: 415 (1989). / PHYSICS AND CHEMISTRY OF MINERALS (1989)
SUMINO, Y, CRC HDB PHYSICAL PRO 3: 39 (1984). / CRC HDB PHYSICAL PRO (1984)
SUZUKI, I, JOURNAL OF PHYSICS OF THE EARTH 27: 53 (1979). (10.4294/jpe1952.27.53) / JOURNAL OF PHYSICS OF THE EARTH (1979)
TAKEI, H, MAT SCI EARTH INTERI: 107 (1984). / MAT SCI EARTH INTERI (1984)
VERHOOGEN, J, PHYSICS OF CONVECTION CURRENTS IN EARTHS MANTLE .22. PHASE CHANGES AND CONVECTION IN EARTHS MANTLE, PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES 258: 276 (1965). / PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES (1965)
WEIDNER, D.J., SINGLE-CRYSTAL ELASTIC PROPERTIES OF THE SPINEL PHASE OF MG2SIO4, JOURNAL OF GEOPHYSICAL RESEARCH 89: 7852 (1984). (10.1029/JB089iB09p07852) / JOURNAL OF GEOPHYSICAL RESEARCH (1984)
WEIDNER, D.J., ELASTICITY OF MGSIO3 IN THE ILMENITE PHASE, PHYSICS OF THE EARTH AND PLANETARY INTERIORS 40: 65 (1985). (10.1016/0031-9201(85)90006-8) / PHYSICS OF THE EARTH AND PLANETARY INTERIORS (1985)
10.1126/science.243.4892.787

Dates

Type	When
Created	18 years, 10 months ago (Oct. 5, 2006, 6:10 p.m.)
Deposited	1 year, 7 months ago (Jan. 12, 2024, 11:17 a.m.)
Indexed	2 months, 4 weeks ago (May 29, 2025, 11:06 a.m.)
Issued	34 years, 11 months ago (Sept. 14, 1990)
Published	34 years, 11 months ago (Sept. 14, 1990)
Published Print	34 years, 11 months ago (Sept. 14, 1990)

Funders 0

None

BibTeX

@article{Ito_1990, title={Negative Pressure-Temperature Slopes for Reactions Formign MgSiO 3 Perovskite from Calorimetry}, volume={249}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.249.4974.1275}, DOI={10.1126/science.249.4974.1275}, number={4974}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Ito, E. and Akaogi, M. and Topor, L. and Navrotsky, A.}, year={1990}, month=sep, pages={1275–1278} }

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