Energy dispersive X-ray spectroscopy (EDS) spectrum for single crystal of La0.7Ca0.3MnO3.
Observed (symbols), calculated (lines), and difference (lower lines) XRD profiles for single crystal of La0.7Ca0.3MnO3: (a) Pnma phase at 297 K and (b) phase at 733 K. Reliability factors of the refinements are: Rwp = 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.
The same as in Fig. 2 for La0.7Ca0.3MnO3 ceramics. Rwp = 6.44% and 5.66% for respective (a) and (b) Rietveld fits.
XRD profile for La0.7Ca0.3MnO3 ceramics at T = 688 K, showing coexistence of Pnma and phases. Upper ticks indicate the expected Bragg-peak positions of the orthorhombic phase, whereas lower ones—those of the rhombohedral phase. Rwp = 5.8% for this Rietveld fit.
XRD profiles, observed at T-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 La0.7Ca0.3MnO3 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.
Temperature dependences of the rhombohedral phase fraction from Rietveld refinements for La0.7Ca0.3MnO3 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 (T O-R).
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