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Structure, magnetic, and dielectric characteristics of Ln2NiMnO6 (Ln = Nd and Sm) ceramics
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10.1063/1.4752262
/content/aip/journal/jap/112/6/10.1063/1.4752262
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/6/10.1063/1.4752262

Figures

Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

Evolution of the unit-cell parameters and cell volume with the lanthanide ionic radius (RLn). The data for La2NiMnO6 are extracted from Ref. 30.

Image of FIG. 3.
FIG. 3.

SEM micrographs of the as-sintered surfaces of Nd2NiMnO6 (a) and Sm2NiMnO6 (b) ceramics.

Image of FIG. 4.
FIG. 4.

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.

Image of FIG. 5.
FIG. 5.

Temperature dependence of dielectric properties for Nd2NiMnO6 (a) and (b) and Sm2NiMnO6 (c) and (d).

Image of FIG. 6.
FIG. 6.

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.

Image of FIG. 7.
FIG. 7.

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.

Tables

Generic image for table
Table I.

Structural refinement parameters for Ln2NiMnO6 (Ln = La, Nd, and Sm) ceramics.

Generic image for table
Table II.

Selected structural parameters and magnetic properties for Ln2NiMnO6 (Ln = La, Nd, and Sm) ceramics.

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/content/aip/journal/jap/112/6/10.1063/1.4752262
2012-09-17
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Structure, magnetic, and dielectric characteristics of Ln2NiMnO6 (Ln = Nd and Sm) ceramics
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/6/10.1063/1.4752262
10.1063/1.4752262
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