vector mechanics

Aug 16th, 2016
Studypool Tutor
Price: $5 USD

Tutor description

Word Count: 444
Showing Page: 1/22
CYL 100 General ChemistryInorganic PartByS. NagendranSNdDepartment of ChemistryIIT DelhiLecture-03SpinelsThe site preference in spinels can be accounted through CFTSpinels are crystalline materials of general formula AB2O4SpinelsAGroup IIA metalGt l ((or))Transition metal in +2 oxidation stateBGroup IIIA metal (or)Transition metal in +3 oxidation stateOxide ions form cubic close-packed latticeFor one unit of AB2O4 there are 8 Td and 4 Oh holesA2+ ions occupy 1/8 Td holesB3+ ions occupy 1/2 of the Oh holesNormal SpinelA2+ and one-half of the B3+ ionsoccupy Oh holesThe other one-halfone half of B3+ ions occupyTd holesIInversee e Spinelpi eSpinelsTo find out the structure of spinel (normal or inverse), find out thedifference in CFSE for the particular metal ion in Oh and TdenvironmentsThis difference is called as Octahedral Site Stabilization (or) SplittingEnergy (OSSE)As the o values for several hexa-aqua complexes are known, for thecalculation of OSSE it can be assumed that the strengthg of oxide ionsand aqua ligands are almost similarSpinelsExperimental values forhexa-aqua complexesCalculatedCl l d usingit 4/9 oSpinelsMn3O4 (Mn2+Mn3+2 O4)NiFe2O4 (Ni2+Fe3+2 O4)Mn2 + d5 t2g3eg2 CFSE = 0(Oh and Td)Ni2 + d8 e4t24 (td) CFSE =0.8 t = 0.4 oMn3+ d4 t2g3eg1 CFSE = 0.6oNi2 + d8 t2g6eg2 (Oh) CFSE =1.2 oNormal spinel

Review from student

Studypool Student
" Goes above and beyond expectations ! "
Ask your homework questions. Receive quality answers!

Type your question here (or upload an image)

1829 tutors are online

Brown University





1271 Tutors

California Institute of Technology




2131 Tutors

Carnegie Mellon University




982 Tutors

Columbia University





1256 Tutors

Dartmouth University





2113 Tutors

Emory University





2279 Tutors

Harvard University





599 Tutors

Massachusetts Institute of Technology



2319 Tutors

New York University





1645 Tutors

Notre Dam University





1911 Tutors

Oklahoma University





2122 Tutors

Pennsylvania State University





932 Tutors

Princeton University





1211 Tutors

Stanford University





983 Tutors

University of California





1282 Tutors

Oxford University





123 Tutors

Yale University





2325 Tutors