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Structural, magnetic and x-ray absorption studies of NdCo1−xNixO3 (0 ≤ x ≤ 0.5)
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Image of FIG. 1.
FIG. 1.

Reitveld refined X-ray diffraction patterns for the samples NdCo1−xNixO3 (0 ≤ x ≤ 0.5). In each panel, solid squares represent observed data, and the line shows the calculated profile. The difference between the observed and the calculated patteren is shown at the bottom.

Image of FIG. 2.
FIG. 2.

XANES spectra for Co K-edge of NdCo1−xNixO3 (0 ≤ x ≤ 0.5). No edge shift is observed on substitution. The enlarged view of pre edge region is shown in inset. The arrows indicate the shift in the spectral response with substitution.

Image of FIG. 3.
FIG. 3.

XANES spectra for Ni K-edge of NdCo1−xNixO3 (0.1 ≤ x ≤ 0.5). Clear indication of +3 valance state of Ni appears in all composition.

Image of FIG. 4.
FIG. 4.

Temperature dependence of dc magnetic susceptibility under different modes at a field of 1 kOe for NdCo1−xNixO3 (0 ≤ x ≤ 0.5). Solid squares represent ZFC, open circles show FCC and open triangles are for FCW mode. A bifurcation in ZFC and FC curves appears after x = 0.2, which shows a composition dependent magnetic behaviour at low temperature.

Image of FIG. 5.
FIG. 5.

The variation of AC magnetic susceptibility with temperature at different frequencies for x ≥ 0.3. Tf represents the spin glass freezing temperature. The shifting of peak position to higher temperature with increase in frequency is clearly seen.

Image of FIG. 6.
FIG. 6.

Isothermal Magnetization hysteresis loops (M-H) of NdCo1−xNixO3 (0 ≤ x ≤ 0.5) at 10 K. Change in the shape of the plots with substitution indicates to the coexistence of AFM and FM ordering for samples with x ≥ 0.3.


Generic image for table
Table I.

Reitveld refined unit cell parameters for NdCo1−xNixO3 (0 ≤ x ≤ 0.5).

Generic image for table
Table II.

Parameters viz. effective magnetic moment μeff and Weiss constant (θ) calculated for NdCo1−xNixO3 (0 ≤ x ≤ 0.5) from Curie Weiss fit of magnetization data measured at 1000 Oe of applied field.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Structural, magnetic and x-ray absorption studies of NdCo1−xNixO3 (0 ≤ x ≤ 0.5)