Ferrimagnetic Ordering and Spin-Glass State in Diluted GdFeO(3)-Type Perovskites (Lu(0.5)Mn(0.5))(Mn(1−x)Ti(x))O(3) with x = 0.25, 0.50, and 0.75

ABO(3) perovskite materials with small cations at the A site, especially those with ordered cation arrangements, have attracted a great deal of interest because they show unusual physical properties and deviations from the general characteristics of perovskites. In this work, perovskite solid solutions (Lu(0.5)Mn(0.5))(Mn(1−x)Ti(x))O(3) with x = 0.25, 0.50, and 0.75 were synthesized by means of a high-pressure, high-temperature method at approximately 6 GPa and approximately 1550 K. All the samples crystallize in the GdFeO(3)-type perovskite structure (space group Pnma) and have random distributions of the small Lu(3+) and Mn(2+) cations at the A site and Mn(4+/3+/2+) and Ti(4+) cations at the B site, as determined by Rietveld analysis of high-quality synchrotron X-ray powder diffraction data. Lattice parameters are a = 5.4431 Å, b = 7.4358 Å, c = 5.1872 Å (for x = 0.25); a = 5.4872 Å, b = 7.4863 Å, c = 5.2027 Å (for x = 0.50); and a = 5.4772 Å, b = 7.6027 Å, c = 5.2340 Å (for x = 0.75). Despite a significant dilution of the A and B sublattices by non-magnetic Ti(4+) cations, the x = 0.25 and 0.50 samples show long-range ferrimagnetic order below T(C) = 89 K and 36 K, respectively. Mn cations at both A and B sublattices are involved in the long-range magnetic order. The x = 0.75 sample shows a spin-glass transition at T(SG) = 6 K and a large frustration index of approximately 22. A temperature-independent dielectric constant was observed for x = 0.50 (approximately 32 between 5 and 150 K) and for x = 0.75 (approximately 50 between 5 and 250 K).