“…24 So, the first issue needed to be confirmed is whether a stable crystal structure with numerous ions can be formed. For perovskite oxides (ABO 3 ), the stability of structure can be evaluated via the Goldschmidt tolerance factor ( t ) according to equation: 1,21,25,26
where R A , R B , and R O are the average ionic radii for A-site, B-site, and oxygen ions obtained from the works of R. D. Shannon (Table S1†). 27 Materials with ideal perovskite structure show a t value of 1.…”