Fig. 2: Tolerance factor t versus average ionic radius of A-site for simple perovskites ATiO3 and A-site-ordered perovskites AA′3Ti4O12.
From: A combinatory ferroelectric compound bridging simple ABO3 and A-site-ordered quadruple perovskite
Upper right panel is the area for simple ATiO3 perovskites; Lower left panel is the area for AA′3Ti4O12 perovskites; The middle point is PHTO.
