Cited by 95High-pressure geophysics and materialsThermal properties of materialsGeological and Geochemical Analysis

Thermal diffusivity of Mg2SiO4, Fe2SiO4, and NaCl at high pressures and temperatures

Fujisawa, Hideyuki, Fujii, Naoyuki, Mizutani, Hitoshi, Kanamori, Hiroo, Akimoto, Syun-iti·1968·Journal of Geophysical Research

Abstract

The pressure and temperature variations of thermal diffusivity of poly crystalline Mg2SiO4 have been measured for the range 24 to 50 kb and 400° to 1300°K. Effect of the olivine-spinel phase transition on thermal diffusivity of Fe2SiO4 was studied at 48.5 kb for the temperature range 350° to 650°K. Synthetic samples with grain size 1 to 5 microns were used. For the pressure range studied, the reciprocal of thermal diffusivity 1/κ of Mg2SiO4 increases almost linearly with temperature up to about 1200°K, as expected from the theory of phonon conduction, but is nearly constant above that temperature. The 1/κ versus temperature curve of Fe2SiO4 (olivine) is nearly straight up to 700°K, where it becomes slightly convex. The thermal diffusivity of NaCl is measured under similar conditions for comparison with Bridgman's data. The agreement is reasonably good. The pressure derivative ∂κ/∂P, at P = 40 kb is 1.8 × 10−4 cm2/sec kb (at 700°K) and 0.8 × 10−4 cm2/sec kb (at 1100°K) for Mg2SiO4, and 4.7 × 10−4 cm2/sec kb (at 700°K) for NaCl. This pressure dependence can be explained by the theory of phonon conduction. The thermal diffusivity of Fe2SiO4 (spinel) is about 1.5 times that of Fe2SiO4 (olivine) over the range 350° to 650°K. The effect of radiative heat transfer in Mg2SiO4 is discussed. The photon mean free path is estimated to be 0.3 mm at 1400°K.

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Crossref · 10.1029/jb073i014p04727

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  • Measurements of thermal conductivity of rocks likely to form the mantle by Fujisawa et al. (1968) and Schatz & Simmons (1972) showed only small variations in conductivity with temperature.

    “measurements of the thermal conductivity of rocks likely to form the mantle by Fujisawa et al. (1968) and more recently by Schatz & Simmons (1972) showed only small variations in conductivity with temperature.”

    From Speculations on the Thermal and Tectonic History of the Earth (2007) · cites this paper as Fujisawa et al. (1968)

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Authors
Fujisawa, H., Fujii, N., Mizutani, H., Kanamori, H., & Akimoto, S.-I.
Affiliations
The Institute for Solid State Physics, The University of Tokyo (JP)
Venue
Journal of Geophysical Research
Published
1968-07-15
Volume
73
Issue
14
Pages
4727-4733
ISSN
0148-0227 (ISSN-L)
OpenAlex
W2046613261
Cited by
95
References
21
Citations by year
2026: 2 · 2024: 1 · 2023: 1 · 2022: 1 · 2021: 2 · 2019: 5 · 2018: 2 · 2017: 1 · 2015: 1 · 2012: 3
FWCI
1.53
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Geophysical Research Atmospheres (publishedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › High-pressure geophysics and materials
  • Physical Sciences › Materials Science › Materials Chemistry › Thermal properties of materials
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
Keywords
thermal diffusivity, forsterite, fayalite, sodium chloride, high pressure, high temperature, phonon transport, pressure derivative, radiative transfer, photon mean free path, silicate minerals

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