By Alexandra Navrotsky, Donald J. Weidner

ISBN-10: 0875900712

ISBN-13: 9780875900711

ISBN-10: 1118664183

ISBN-13: 9781118664186

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Published by means of the yank Geophysical Union as a part of the Geophysical Monograph Series.


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Additional resources for Perovskite: A Structure of Great Interest to Geophysics and Materials Science

Sample text

In both Table 7 and Figure 3 we note that, the pressure and temperature dependence of the bulk modulus which is required to match the seismic data are very similar to what would be expected on the basis of behavior of other silicates. On the other hand, the required magnitude of the temperature derivative of the shear modulus of perovskite is several times greater than is normally observed. We speculate that such a large negative value results only if the mantle temperature is sufficiently close to that required for a paraelastic-ferroelastic phase transformation as to induce significant transverse mode softening.

The psuedobinary diagram of the system MgSiO 3 -FeSiO 3 at 1100 °C made by Ito and Yamada [1982] is reproduced in Fig. 1. The pressures were Fig. 1 Pseudobinary diagram of the system MgSiO 3 Pv: after Ito and Yamada(1982). -FeSiO - 3 perovskite; I: ilmenite; Mw: magnesiowbstite; Sp: spinel; St: stishovite. Geophysical Monograph Series Perovskite: A Structure of Great Interest to Geophysics and Materials Science Vol. 45 29 ITO reduced by about 1 GPa, consistent with our cur rent calibration [Ito and Takahashi, 1988], and the three - phase field of perovskite + magnesiowustLte + stishovite has been shifted slightly towards magnesium - rich compositions, taking more recent results into account.

M. Vaughan, M. , and J. D. Bass, SingleH. Manghnani and Y. Syono, Terra. crystal elastic properties of Sci. , Tokyo; American protoenstatite: A comparison with Geophysical Union, Washington, D. C. orthoenstatite, J. Phys. Chem. ,315-331, 1987. Minerals, 10, 62-68, 1983. , H-K. Mao, and M. , Soft modes and structural phase transitions, Bull. type MgSiO 3 , in Advances in Physical Matt. , 1, 129-163, 1979. Geochemistry, 2 ed. Saxena, pp. 317Walck, M. , The P wave upper mantle 325, Springer-Verlag, New York, 1982.

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Perovskite: A Structure of Great Interest to Geophysics and Materials Science by Alexandra Navrotsky, Donald J. Weidner

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