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Thermal Expansion of MgFe 2 O 4 , FeO, and MgO·2FeO
Author(s) -
CARTER R. E.
Publication year - 1959
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1959.tb14317.x
Subject(s) - wüstite , thermal expansion , ferrite (magnet) , materials science , thermal , magnesium , metallurgy , mineralogy , thermodynamics , crystallography , chemistry , composite material , magnetite , physics
The thermal expansion of magnesium ferrite, wüstite, and magnesio‐wüstite has been measured up to 1000°C. Good agreement has been found with published data obtained at lower temperatures, but the reported extrapolations have been shown to be low. The thermal expansion of MgFe 2 O 4 has been interpreted to support Gilleo's hypothesis that the super‐exchange energy for Fe 3+ ‐O 2‐ ‐Fe 3+ linkages is independent of the Fe 3+ ‐O 2‐ distance. This conclusion is supported by the fact that the energy per linkage is the same as that for Fe 3+ ‐O 2‐ Fe 3+ linkages in a variety of crystal structures.