Physics and Chemistry of Minerals

, Volume 17, Issue 2, pp 168-172

First online:

High-temperature X-ray diffraction study of Co3O4: Transition from normal to disordered spinel

  • Xing LiuAffiliated withDepartment of Earth and Space Sciences, State University of New York
  • , Charles T. PrewittAffiliated withGeophysical Laboratory, Carnegie Institution of Washington

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A high-temperature x-ray powder diffraction structural refinement indicates that the room-temperature normal spinel, Co2+[Co 2 3+ ]O4, transforms to a disordered spinel at temperatures above 1150±30 K, as shown by the decrease of the oxygen u parameter. It is also shown that this transition between normal and disordered spinel is a high order one, where the degree of disordering increases with increasing temperature up to the highest temperature of this study, 1201 K.