Perovskites: "Effective" Temperature and Coordination Dependence of 38 Ionic Radii

The lattice parameters of thirty-one temperature dependent and six single temperature Pm (3) over barm Perovskites have been utilized within the simple ideal Perovskite planar and volume constrained ionic radii structural model to evaluate the effective ionic radii values and ionic radii thermal expansion coefficients of: (i) 12-fold coordinated A-site ions, where A is Ag1+, Cs1+, Na1+, K1+, Rb1+, Ba2+, Ca2+, Eu2+, Pb2+, Sr2+, Ce3+, and La3+; (ii) 6-fold coordinated B-site ions, where B is Ca2+, Mg2+, Mn2+, Pb2+, Al3+, Ce4+, Cr4+, Hf4+, Mo4+, Os4+, Pb4+, Pr4+, Ru4+, Sn4+,Tb4+, Tc4+, Ti4+, U4+, Zr4+, Nb5+, Ta5+, and U5+; and: (iii) 6-fold coordinated C-site anions, where C is, F1-, H1-, I1- and O2-. The determined effective ionic radii values with thermal expansion coefficients are shown to provide fidelity of temperature dependent lattice parameters of at least thirty-one temperature dependent, six single temperature, and, through use of Vegard's Law, twenty-three simply mixed solid solution Pm (3) over barm materials.