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- W3036165177 abstract "The spinel/sesquioxide ((A 1-x ,B x ) 3 O 4 /(A 1-y ,B y ) 2 O 3 ) interphase interface can be formed by either an internal reduction or oxidation process. Internal reduction produces a dispersed product phase in the parent matrix instead of a continuous layer of product phase at the surface (external reduction). The kinetics of and thermodynamic criteria for internal reduction have been described. An (Al 1-y Fe y ) 2 O 3 solid solution, where y≤0.1, can be internally reduced at moderately high temperatures (T≥1300°C) and low oxygen partial pressures (p O2 < 10 -8 ) to produce a dispersion of nearly stoichiometric FeAl 2 O 4 in an almost pure matrix of α-Al 2 C 3 as can be seen by referring to a phase diagram of the second kind (p O2 vs. composition) for this system. FeAl 2 O 4 has a cubic spinel structure which is based on a face-centered cubic (fee) arrangement of oxygen anions while α-Al 2 O 3 has the corundum structure which is based on an hexagonal close-packed (hcp) arrangement of the oxygen anions. Alternatively, the spinel/sesquioxide phase boundary can be produced by oxidation, as in the oxidation of Ni l-z Fe 2+z O 4 to α-Fe 2 C 3 (hematite) in a NiFe 2 O 4 matrix." @default.
- W3036165177 created "2020-06-25" @default.
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- W3036165177 date "1987-08-01" @default.
- W3036165177 modified "2023-10-18" @default.
- W3036165177 title "Structure of spinel/sesquioxide phase boundaries" @default.
- W3036165177 cites W2042390474 @default.
- W3036165177 doi "https://doi.org/10.1017/s0424820100126238" @default.
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