Rietveld analysis results of x-ray diffraction patterns for Nd2NiMnO6 (a) and Sm2NiMnO6 (b). (c) Crystal structure of Ln2NiMnO6 (Ln = Nd and Sm). Gray and purple octahedrons are corresponded to NiO6 and MnO6, respectively. (d) and (e) are local structure of NiO6 and MnO6 octahedrons in the Nd2NiMnO6 and Sm2NiMnO6, respectively. The bond lengths (Å) are shown in the NiO6 and MnO6 octahedrons.
Evolution of the unit-cell parameters and cell volume with the lanthanide ionic radius (RLn). The data for La2NiMnO6 are extracted from Ref. 30.
SEM micrographs of the as-sintered surfaces of Nd2NiMnO6 (a) and Sm2NiMnO6 (b) ceramics.
Temperature dependence of field cooled and zero field cooled magnetization for Nd2NiMnO6 (a) and Sm2NiMnO6 (c). The insets show inverse susceptibility and fits to the high temperature using Curie-Weiss law. Magnetic hysteresis loops of Nd2NiMnO6 (b) and Sm2NiMnO6 (d) measured at various temperatures.
Temperature dependence of dielectric properties for Nd2NiMnO6 (a) and (b) and Sm2NiMnO6 (c) and (d).
Frequency dependence of dielectric constant for Nd2NiMnO6 (a) and Sm2NiMnO6 (c). The solid lines are fitting results according to the modified Debye equation. The natural logarithm of the relaxation time τ vs. 1/T for Nd2NiMnO6 (b) and Sm2NiMnO6 (d). The solid lines are the Arrhenius fitting. Insets show the temperature dependence of α value.
Evolution of the magnetic transition temperature (TC ) and dielectric constant (ε′) with the lanthanide ionic radius (R Ln). The values of La2NiMnO6 are extracted from Ref. 21.
Structural refinement parameters for Ln2NiMnO6 (Ln = La, Nd, and Sm) ceramics.
Selected structural parameters and magnetic properties for Ln2NiMnO6 (Ln = La, Nd, and Sm) ceramics.
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