Garnet typically has the chemical formula: (Fe2+, Mg2+, Ca 2+, Mn2+)3 Al3+2Si4+3O12 The formula can be broken...

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Chemistry

Garnet typically has the chemical formula: (Fe2+, Mg2+, Ca 2+,Mn2+)3 Al3+2Si4+3O12
The formula can be broken up into structural sites (spaces wherecations of a certain size range can occupy) X3Y2Z3O12 where theX-site is coordinated with 8 oxygen anions, the Y-site iscoordinated with 6 oxygen anions, and the Z-site is coordinatedwith 4 oxygen anions. Using the table of ionic radii, calculate thepredicted coordination number (CN) relative to O2- for each cationin the garnet formula. How do the calculated CNs compare to thosefor real garnet? Explain why they are the same or different.

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4.4 Ratings (854 Votes)

Element Ionic Radius in Ar ionic radius ratio rrO2 O2 rO2 132 rrO2 100 i ZSi4 rZ 030 rZrO2 023 The radius ratio is in the range02250414 giving tetrahedral shape with CN4 This See Answer

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