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Electronic structure and electrical transport properties of LaCo1−xNixO3 (0 ≤ x ≤0.5)
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10.1063/1.4818448
/content/aip/journal/jap/114/7/10.1063/1.4818448
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/7/10.1063/1.4818448

Figures

Image of FIG. 1.
FIG. 1.

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

Image of FIG. 2.
FIG. 2.

Schematic presentation of LaCo(Ni)O unit cell.

Image of FIG. 3.
FIG. 3.

(a). The electrical resistivity of LaCoNiO (0 ≤ x ≤ 0.5), (b) plots of ln T. The inset shows a plot of ln vs T for x = 0 and 0.1.

Image of FIG. 4.
FIG. 4.

(a) The hybridization of d-levels of the TM ions and p-levels of the ligand leading to the repulsion of levels and splitting of t and e-levels, (b) the system is insulating (top) as long as the Fermi energy (E) lies within the localized states (shaded regions), when the mobility edge passes the Fermi energy (centre), the system shows metallic behaviour (bottom).

Image of FIG. 5.
FIG. 5.

XANES spectra for the O K-edge of LaCoNiO (0 ≤ x ≤ 0.5). The arrows depict the continuous increase in intensity of feature “a” and simultaneous decrease in that of “b” with substitution.

Image of FIG. 6.
FIG. 6.

XANES spectra for the Co K-edge of LaCoNiO (0 ≤ x ≤ 0.5). No edge shift observed indicating +3 valance state of Co in all compositions.

Image of FIG. 7.
FIG. 7.

XANES spectra for the Ni K-edge of LaCoNiO (0.1 ≤ x ≤ 0.5). No edge shift observed indicating +3 valance state of the Ni in all compositions.

Image of FIG. 8.
FIG. 8.

XANES spectra at the La M edge of LaCoNiO (0.1 ≤ x ≤ 0.5). Spectra confirm +3 valance state of La in all compositions.

Tables

Generic image for table
Table I.

Unit cell and electrical transport parameters for LaCoNiO (0 ≤ x ≤ 0.5) samples.

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/content/aip/journal/jap/114/7/10.1063/1.4818448
2013-08-16
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electronic structure and electrical transport properties of LaCo1−xNixO3 (0 ≤ x ≤0.5)
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/7/10.1063/1.4818448
10.1063/1.4818448
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