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Chemical disorder effect on orthorhombic-rhombohedral structural transition in La0.7Ca0.3MnO3
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View: Figures


Image of FIG. 1.
FIG. 1.

Energy dispersive X-ray spectroscopy (EDS) spectrum for single crystal of LaCaMnO.

Image of FIG. 2.
FIG. 2.

Observed (symbols), calculated (lines), and difference (lower lines) XRD profiles for single crystal of LaCaMnO: (a) nma phase at 297 K and (b) phase at 733 K. Reliability factors of the refinements are: R = 7.3% and 8.6% for respective (a) and (b) Rietveld fits. Tick marks below the patterns indicate the expected Bragg-peak positions. The insets show in detail a selected angular region of the patterns.

Image of FIG. 3.
FIG. 3.

The same as in Fig. 2 for LaCaMnO ceramics. R = 6.44% and 5.66% for respective (a) and (b) Rietveld fits.

Image of FIG. 4.
FIG. 4.

XRD profile for LaCaMnO ceramics at  = 688 K, showing coexistence of nma and phases. Upper ticks indicate the expected Bragg-peak positions of the orthorhombic phase, whereas lower ones—those of the rhombohedral phase. R = 5.8% for this Rietveld fit.

Image of FIG. 5.
FIG. 5.

XRD profiles, observed at -range of 653–713 K; 2θ interval of 57–59.5° only is chosen for clarity. The left and right columns show the change of XRD spectra upon heating and cooling procedures for LaCaMnO single crystal (a) and ceramics (b). Upper and lower rows of ticks in (a) and (b) indicate the Bragg-peak positions of the rhombohedral and orthorhombic phases, respectively.

Image of FIG. 6.
FIG. 6.

Temperature dependences of the rhombohedral phase fraction from Rietveld refinements for LaCaMnO single crystal (a) and ceramics (b). Data were taken during heating (solid symbols) and cooling (open symbols); arrows mark extracted temperatures of the structural O-R phase transition ( ).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Chemical disorder effect on orthorhombic-rhombohedral structural transition in La0.7Ca0.3MnO3