Q1: (25') (Lecture 2) (1) By using the table below (reference: transition metal compounds), can you please calculate the

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Q1 25 Lecture 2 1 By Using The Table Below Reference Transition Metal Compounds Can You Please Calculate The 1 (75.04 KiB) Viewed 34 times

Q1: (25') (Lecture 2) (1) By using the table below (reference: transition metal compounds), can you please calculate the tolerance factor t of BaTiO3, SrTiO3, BaMnO3, SrMnO3 and LaMnOz? (assuming the ionic radius of O2 is 1.40) (2) Can you predict which compound is most likely not perovskite? Why? (3) In recent years, several theoretical studies have predicted interesting properties in perovskite SrMnO3. However, the perovskite phase is very difficult to synthesis, and second phase has usually been observed. Based on the results above, can you explain why is it difficult to synthesize perovskite SrMnO3? 80 Transition metal ions in crystals Table 3.1 Ionic radii of some important ions in A. from Shannon (1976) Element Tonic radius Element T;3+ Ti++ V3+ 14+ Br 1 Mg2+ Zn2+ Cd2+ 1.35-1.42 1.28-1.33 1.81 1.96 2.20 0.57 (IV): 0.72 (VI) 0.60 (IV): 0.74 (VI) 0.78 (IV): 1.31 (XII) 1.34 (XII) 1.44 (XII) 1.61 (XII) 1.36 (XII) Cr+ Mn + Mn+ Mn++ Fe2+. LS Tonic radius (coordination VI 0.67 0.60 0.64 0.58 0.615 0.83 0.645 0.53 0.61 0.78 0.645 0.745 0.545 0.61 0.53 0.57–0.73 (different coordinations) Ca2+ HS Fe3+ HS Sp+ Ba2+ Co2+ La3+ Cot. Ls HS Gd+ Lu+ CO4+ 0.95-1.1 0.9-1.0