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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.

Answer & Explanation Solved by verified expert
4.1 Ratings (772 Votes)
Element Ionic Radius in Ar thn ionic radius ratio rrO2 O2 rO2 132 rrO2 100 For Si4 ZSi4 rZ 030 the ratio rZrO2 023 Find the radius ratio from the range 02250414 this is a tetrahedral shape with    See Answer
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