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(1976). A32, 751 Revised Effective Ionic Radii and ...

751 Acta Cryst. (1976). A32, 751 Revised Effective Ionic Radii and Systematic Studies of Interatomie Distances in Halides and Chaleogenides BY R. D. SHANNON Central Research and Development Department, Experimental Station, E. L Du Pont de Nemours and Company, Wilmington, Delaware 19898, (Received 30 October 1975; accepted 9 March 1976) The Effective Ionic Radii of Shannon & Prewitt [Acta Cryst. (1969), B25, 925-945] are Revised to include more unusual oxidation states and coordinations. Revisions are based on new structural data, empirical bond strength-bond length relationships, and plots of (1) Radii vs volume, (2) Radii vs coordination number, and (3) Radii vs oxidation state. Factors which affect Radii additivity are polyhedral distortion, partial occupancy of cation sites, covalence, and metallic character.

rare earth radii in eight- and nine-coordination using accurate cell dimensions for rare earth trifluorides and distances calculated using the structural parameters of YF3 and LaF3. These radii were used in Table 1 after applying small corrections (+ 0.030 ,~ to lXLa3+,

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