Physics
Scientific paper
Dec 1968
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968pepi....1..498a&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 1, Issue 7, p. 498-504.
Physics
13
Scientific paper
Stability relations of Co2SiO4 have been studied sover the temperature range 715° to 1530 °C in the pressure range s59 to 93 kb with the aid of a tetrahedral anvil type of high-pressure sapparatus. It was found that at temperatures below about 930 °C the solivine polymorph of Co2SiO4 s(Co2SiO4 I) transformed directly to the spinel spolymorph (Co2SiO4 III) at high pressures. At the shigher temperatures, however, a new high-pressure polymorph with sorthorhombic structure (Co2SiO4 II) was observed sin the pressure range intermediate between the olivine and the spinel sfield. The triple point in the system Co2SiO4 I s(olivine) - Co2SiO4 II - sCo2SiO4 III (spinel) was approximately determined sto be at 930 °C and 68 kb. Density increases associated with the sCo2SiO4 I - Co2SiO4 II stransformation and the Co2SiO4 II - sCo2SiO4 III transformation were estimated to be s7.1% and 2.5%. It is suggested that the analogous stepwise phase stransformation from olivine to spinel through an intermediate sorthorhombic phase might be excepted in the mantle olivine.
Akimoto Syun-Iti
Sato Yosiko
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