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Among multifunctional double perovskite oxides, La2NiMnO6 has recently drawnsignificant attention due to its importance both in terms of understanding offundamental physics and potential for device applications. The relativealteration in Ni:Mn ratio strongly influences the structural, magnetic andelectrical properties of La2NiMnO6. In the present study, La2Ni1.5Mn0.5O6sample with Ni:Mn = 3:1 ratio has been prepared using sol-gel method andmodifications of the above physical properties from that of a stiochiometricsample of La2NiMnO6 are discussed. Rietveld analysis of X-ray diffraction datashows that La2Ni1.5Mn0.5O6 samples belong to a major monoclinic structuralphase (P21/n), with partially disordered arrangement of Ni and Mn ions.Magnetic characterization and X-ray absorption near edge structure analysisreveal ferromagnetic ordering around 260 K between Ni2+ and Mn4+ ions whilespin glass like behavior is revealed at ~45 K. Semiconducting nature of thesample was confirmed from temperature dependent resistivity measurements aswell as from the I-V characteristics measured at room temperature.

Structural, Electrical, and Magnetic Properties of La2Ni1.5Mn0.5O6 double perovskites