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Single-phase mixed aluminates-titanates Pr 1− x  Sr  x  Al 1− x  Ti  x  O 3  ( x  = 0.1, 0.2, 0.3, 0.5, 0.7) with rhombohedral perovskite structure were prepared by solid-state reaction technique at 1823–1873 K. Morphotropic rhombohedral-to-cubic phase transition in Pr 1− x  Sr  x  Al 1− x  Ti  x  O 3  series is predicted to occur at  x  = 0.88. The temperature-induced structural phase transition  R      \documentclass[12pt]{minimal} 				\usepackage{amsmath} 				\usepackage{wasysym}  				\usepackage{amsfonts}  				\usepackage{amssymb}  				\usepackage{amsbsy} 				\usepackage{mathrsfs} 				\usepackage{upgreek} 				\setlength{\oddsidemargin}{-69pt} 				\begin{document}$$ \overline{3} $$\end{document}    3  ¯   с  −  Pm    \documentclass[12pt]{minimal} 				\usepackage{amsmath} 				\usepackage{wasysym}  				\usepackage{amsfonts}  				\usepackage{amssymb}  				\usepackage{amsbsy} 				\usepackage{mathrsfs} 				\usepackage{upgreek} 				\setlength{\oddsidemargin}{-69pt} 				\begin{document}$$ \overline{3} $$\end{document}    3  ¯   m  in Pr 0.5 Sr 0.5 Al 0.5 Ti 0.5 O 3 , detected at 930 K by in situ high-temperature X-ray synchrotron powder diffraction, occurs at considerably lower temperature as the corresponding transformation in the parent compound PrAlO 3  (1770 K). Such remarkable drop of the transition temperature is explained by gradual decrease of the perovskite structure deformation in the Pr 1− x  Sr  x  Al 1− x  Ti  x  O 3  series with increasing Sr and Ti contents as a consequence of the increasing Goldschmidt tolerance factor. For Pr 0.3 Sr 0.7 Al 0.3 Ti 0.7 O 3  phase, a sequence of the low-temperature phase transformation  R      \documentclass[12pt]{minimal} 				\usepackage{amsmath} 				\usepackage{wasysym}  				\usepackage{amsfonts}  				\usepackage{amssymb}  				\usepackage{amsbsy} 				\usepackage{mathrsfs} 				\usepackage{upgreek} 				\setlength{\oddsidemargin}{-69pt} 				\begin{document}$$ \overline{3} $$\end{document}    3  ¯   с − Immb ( C 2/ m )  − I 4/ mcm  was detected.

Concentration- and Temperature-Induced Phase Transitions in PrAlO3–SrTiO3 System