2006
DOI: 10.1002/jrs.1484
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Raman spectroscopy on cubic and hexagonal SrMnO3

Abstract: We report on the first optical characterization of both cubic and hexagonal SrMnO3. Room-temperature Raman spectra collected by means of a micro-Raman spectrometer are shown. The spectrum of the cubic compound is characterized by weak and broad bands in agreement with group theory which predicts no Raman-active phonons for this compound. On the other hand, the spectrum of the hexagonal compound shows six narrow peaks ascribed to one-phonon processes. A complete polarization analysis of the spectra collected fr… Show more

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Cited by 35 publications
(17 citation statements)
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“…The SMO catalyst was synthesized by the polymerized complex method (see details given in the Experimental Section) . The powder X‐ray diffraction (XRD) pattern for SMO is shown in Figure b, which is in good agreement with that for the reported hexagonal SrMnO 3 phase [space group P 63/ mmc ] . Impurity phases of other manganese oxides and SrCO 3 were not observed (Figure S1).…”
Section: Resultssupporting
confidence: 69%
“…The SMO catalyst was synthesized by the polymerized complex method (see details given in the Experimental Section) . The powder X‐ray diffraction (XRD) pattern for SMO is shown in Figure b, which is in good agreement with that for the reported hexagonal SrMnO 3 phase [space group P 63/ mmc ] . Impurity phases of other manganese oxides and SrCO 3 were not observed (Figure S1).…”
Section: Resultssupporting
confidence: 69%
“…3) we assign them respectively to E 2g and breathing A 1g modes of SbO 6 corner-sharing octahedra. A number of wide overlapping bands is observed in 500-650 cm −1 range, where we expect stretching vibrations of the "inner" oxygens O2 14,18,19 which have larger line width. In spectra of (x x ) polarization below 200 K (Fig.…”
Section: A Room Temperaturementioning
confidence: 73%
“…The newly activated Raman modes cannot come from a secondary hexagonal phase, because the hexagonal phase does not have any phonons above 800 cm −1 and our low-frequency modes also do not correspond to phonons of hexagonal SrMnO 3 [17,23]. Moreover, 4H hexagonal SrMnO 3 exhibits structural and magnetic phase transitions already around 380 K and 280 K, respectively [24].…”
Section: B Raman Spectroscopy Studiesmentioning
confidence: 75%