Ionic radii (Shannon) for tetrahedral M(IV) ion

These are Shannon ionic radii.

Units

pm

Notes

The "effective ionic radii" quoted here assume that the ionic radius of F^- is 133 pm and that of O^2- is 140 pm.

Values depend upon the coordination number and for d-block metals whether or not the metal is in a high or low spin state.

Older "crystal ionic radii" are based upon a radius of six-coordinate F^- = 119 pm and are 14-18% larger than effective ionic radii.

You can look at visual representations of the data for different coordination and oxidation numbers using the following links,

M(-III)
- Ionic radii (Shannon) for tetrahedral M(-III) ion
- Ionic radii (Shannon) for octahedral M(-III) ion
M(-II)
M(-I)
M(I)
M(II)
M(II)
M(III)
M(IV)
M(VI)
M(VII)
- Ionic radii (Shannon) for tetrahedral M(VII) ion
- Ionic radii (Shannon) for octahedral M(VII) ion
M(VIII)
- Ionic radii (Shannon) for tetrahedral M(VIII) ion
- Ionic radii (Shannon) for octahedral M(VIII) ion

Literature sources

R.D. Shannon, Acta Cryst., 1976, A32, 751.
R.D. Shannon and C.T. Prewitt, Acta Cryst., 1969, B25, 925.
R.D. Shannon and C.T. Prewitt, Acta Cryst., 1970, B26, 1046.
J.E. Huheey, E.A. Keiter, and R.L. Keiter in Inorganic Chemistry : Principles of Structure and Reactivity, 4th edition, HarperCollins, New York, USA, 1993.

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