"Transition Metal Oxide Structures"

a) Using this periodic table of ionic radii, calculate the Goldschmidt tolerance factor for the following perovskite oxides: SrFeO3 (SFO) and CaTiO3 (CTO). Note: The A-site in the perovskite structure is 12-fold coordinated, the B-site has a different coordination. Make sure you use the ionic radii with the correct coordination for each element.

b) Given the tolerance factors in part (a), write down what you expect the room-temperature crystal structure classes for CTO and SFO to be (i.e., cubic, tetragonal, etc.)

c) For SFO, identify the Fe valence and d-orbital occupation (i.e., FeX+, dY). [1 pt] d) For SFO, draw the high-spin and low-spin electron filling diagrams with octahedral crystal field splitting.