Abstract
A systematic study of the structural and magnetic properties of the diluted perovskite manganite oxides (La 1− y Pr y ) 0.9Na 0.1MnO 3 (0.2≤ y≤0.8) had been carried on. In this study, the average ionic radius 〈 r A〉 of the A cation site was systematically varied while keeping fixed the carrier concentration (Mn 3+/Mn 4+ ratio). X-Ray diffraction investigations showed a structural transition from the rhombohedral to the orthorhombic system for 0.33≤ y≤0.5. The unit cell volume decreases with increasing Pr 3+ content. Magnetic measurements showed that our synthesized samples exhibit a paramagnetic to ferromagnetic transition with decreasing temperature. Neutron diffraction studies show that (La 0.2Pr 0.8) 0.9Na 0.1MnO 3 powder sample crystallizes in the orthorhombic system with Pnma space group at room temperature and at 10 K. The magnetic moment of Pr and Mn atoms are coupled parallel to the b-axis.
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