The pseudobinary system LaLuO3-LaScO3 was explored in hopes of discovering new perovskite-type substrates with pseudocubic lattice parameters above 4 A. A complete solid solution of the type (LaLuO3)(1-x)(LaScO3)(x) forms between the end members LaLuO3 and LaScO3, enabling large single crystals of (LaLuO3)(1-x)(LaScO3)(x) to be grown from the melt. A single crystal with x approximate to 0.34 was demonstrated. Considering the maximum thermal load of the iridium crucibles appropriate for Czochralski growth of this solid solution, the theoretically maximum achievable x -value is similar to 0.67. Based on the phase diagram determined, it is anticipated that single crystals with pseudocubic lattice constants between 4.09 and 4.18 angstrom can be grown in this system by the Czochralski method. (C) 2016 Elsevier B.V. All rights reserved.