The stability of hercynite at high pressures and temperatures
The stability of hercynite at high pressures and temperatures
复制标题
铁铝尖晶石在高压和高温下的稳定性
DOI:
10.1007/s00269-009-0317-z
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发表时间:
2009
影响因子:
1.4
通讯作者:
Frost DJ
中科院分区:
文献类型:
--
作者:
Schollenbruch;Woodland AB;Frost DJ
The stability of hercynite (FeAl2O4) has been investigated experimentally between 7 and 24 GPa and 900 and 1,700°C. Hercynite breaks down to its constituent oxides at 7–8.5 GPa and temperatures >1,000°C. The incorporation of a small magnetite component in the hercynite necessitated a small correction to fix the location of the endmember reaction: FeAl2O4= Al2O3+ FeO inP–Tspace. After making this correction, the position of the phase boundary was used to evaluate thermodynamic data for hercynite. Our results support a relatively largeS298°for hercynite, on the order of 115 J mol−1K−1. Experiments up to 24 GPa and 1,400°C failed to detect any high-pressure polymorph of FeAl2O4; only corundum + wüstite were detected. This behaviour contrasts with that observed for the analogous MgAl2O4system where the constituent oxides recombine at high pressure to produce “post-spinel” phases with CaFe2O4-type and CaTi2O4-type structures.
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DOI:
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发表时间:
1975
期刊:
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Lin‐gun Liu
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