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Shannon has about 164 publications that, together, have received over 77 thousand citations. [8] His work on ionic radii of ions has drawn particularly wide attention. In a 2014 Nature paper [9] his 1976 work on the ionic radii of ions [10] was recognized as the 22d most cited paper in all of
To be consistent with Pauling's radii, Shannon has used a value of r ion (O 2−) = 140 pm; data using that value are referred to as "effective" ionic radii. However, Shannon also includes data based on r ion (O 2−) = 126 pm; data using that value are referred to as "crystal" ionic radii. Shannon states that "it is felt that crystal radii ...
The strength of the M-O bond tends to increase with the charge and decrease as the size of the metal ion increases. In fact there is a very good linear correlation between hydration enthalpy and the ratio of charge squared to ionic radius, z 2 /r. [4] For ions in solution Shannon's "effective ionic radius" is the measure most often used. [5]
It makes no sense to list numbers without stating the charge of every ion listed. There is nothing like "ionic radius" of iron, osmium, etc. Who will guess it is Shannon radius calculated for six-coordinate high-spin Fe(3+) and e.g. not for Fe(2+)? The same for most elements. And one should not compare atomic radii obtained with different methods.
He moved to DuPont Central Research Laboratory in Wilmington, Delaware, where he worked with Robert D. Shannon to compile the effective ionic radii, [2] which became an important foundation of modern crystal chemistry.
For typical ionic solids, the cations are smaller than the anions, and each cation is surrounded by coordinated anions which form a polyhedron.The sum of the ionic radii determines the cation-anion distance, while the cation-anion radius ratio + / (or /) determines the coordination number (C.N.) of the cation, as well as the shape of the coordinated polyhedron of anions.
The second didn’t match anyone in the national database. Cabanillas’ conviction was thrown out. He was freed in 2023 – four years after testing was approved and 28 years after he was first ...
The effective radius of the polonide ion (Po 2−) can be calculated from the Shannon (1976) ionic radii of the cations: [8] 216 pm for 4-coordination, 223 pm for 6-coordination, 225 pm for 8-coordination. The effect of the lanthanide contraction is clear, in that the 6-coordinate telluride ion (Te 2−) has an ionic radius of 221 pm. [8]