A trioxide is a compound with three oxygen atoms. For metals with the M2O3 formula there are several common structures. Al2O3, Cr2O3, Fe2O3, and V2O3 adopt the corundum structure. Many rare earth oxides adopt the "A-type rare earth structure" which is hexagonal. Several others plus indium oxide adopt the "C-type rare earth structure", also called "bixbyite", which is cubic and related to the fluorite structure.[1]

List of trioxides

MO3

M2O3

Other trioxides

References

  1. Jaffe, Howard W. (1996). Crystal Chemistry and Refractivity. Courier Dover Publications. pp. 266–272. ISBN 978-0-486-69173-2.
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