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The effect of cationic size mismatch at the A site at constant manganesevalence on the structural and magnetic properties of a perovskite-typerare-earth manganate was investigated in the Pr0.9(Na1-xKx)0.1MnO3 solidsolution system (0 <= x < 1). All members of this solid solution series areorthorhombic at room temperature, space group Pbnm. Structural refinementsusing the Rietveld method show that the cell volume increases and the staticJahn-Teller distortion decreases with increasing potassium content x. Magneticproperties are characterized by strong positive \theta p values, and areascribed to a canted ferromagnetic arrangement. The high Curie constant valuesin the paramagnetic regime can be explained by a magnetic cluster model of 2-3Mn ions.

Effect of mixed alkali-element substitution on structural and magnetic properties of praseodymium manganites Pr0.9(Na1-xKx)0.1MnO3