Synchrotron X-ray absorption of LaCoO3 perovskite

Haas, O.; Struis, Rudolf Paul Wilhelm Jozef; McBreen, J.

doi:10.1016/j.jssc.2003.10.004

Cited by 128 publications

(100 citation statements)

References 48 publications

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“…The quantitative analysis based on the calibration using Pr The pre-edge peak, shown in more detail in the inset of Fig.11, exhibits also little change with decreasing temperature. Compared to the spectra of LnCoO 3 , that allow a decomposition to t 2g and e g components and the temperature induced spin states can be readily probed [21,22], the pre-edge peak in mixed-valent cobaltites is much broader and rather featureless. The same vague shape applies also for the pre-edge peak of present Pr 0.63 Y 0.07 Ca 0.3 CoO 3 sample.…”

Section: Schottky-like Anomaly Is Calculated As [(∆Ementioning

confidence: 99%

Phase transition in Pr0.5Ca0.5CoO3 and related cobaltites

et al. 2013

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We present an extensive investigation (magnetic, electric and thermal measurements and X-ray absorption spectroscopy) of the Pr 0.5 Ca 0.5 CoO 3 and (Pr 1-y Y y ) 0.7 Ca 0.3 CoO 3 (y = 0.0625 -0.15) perovskites, in which a peculiar metal-insulator (M-I) transition, accompanied with pronounced structural and magnetic anomalies, occurs at 76 K and 40 -132 K, respectively. The inspection of the M-I transition using the XANES data of Pr

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Section: Schottky-like Anomaly Is Calculated As [(∆Ementioning

confidence: 99%

Phase transition in Pr0.5Ca0.5CoO3 and related cobaltites

et al. 2013

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“…However, an accurate description of the reached magnetic state is still an object of debate. [5][6][7][8][9][10][11][12] Whereas a set of experiments were considered indicative of an intermediate spin (IS, t 2g 5 e g 1 and S = 1) lowest excited state, [5][6][7][8][9] other results suggest a LS-high spin (HS, t 2g 4 e g 2 and S = 2) scenario for the low temperature transition. 10,11 The first possibility would permit the existence of Co 3+ Jahn-Teller (JT) active ions, which could be a source of enhanced electron-phonon coupling due to correlations with mobile charges.…”

Section: Introductionmentioning

confidence: 99%

“…The possible presence of these local distortions and small JT polarons has been addressed by theory and different experimental techniques. [7][8][9]12 In summary, whether the magnetic activated state is due to IS or HS configuration remains controversial for LaCoO 3 , highlighting the need for more conclusive investigations.…”

Section: Introductionmentioning

confidence: 99%

Spin-state transition in Pr0.5Ca0.5CoO3analyzed by x-ray absorpt

et al. 2012

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We present a study of the Co spin-state changes in Pr 0.5 Ca 0.5 CoO 3 across the metal-insulator transition by means of the analysis of two complementary synchrotron x-ray spectroscopic techniques. Recorded experimental and charge transfer multiplet-based calculated Co L 2,3 absorption spectra, in combination with Co Kβ main emission lines, indicate that Co 3+ ion spin state evolves from low in the insulating phase to a low:high mixed state in the metallic regime, close to a 1:1 ratio at ambient temperature. A pure high spin state can be discarded, while the occurrence of an intermediate state is also questioned.

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“…Among the perovskite-based materials, LaCoO 3 has shown good sensitivity in CO detection [3]. Catalytic activity also has been detected in LaCoO 3 , for example, in the decomposition of NO x , the combustion of methane and propane, and the oxidation of CO [6]- [8].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Nanocrystalline LaMO3 (M = Co, Al) Perovskite Oxide Prepared by Co-Precipitation Method

Haron¹,

Wisitsoraat²,

Wongnawa³

2014

IJCEA

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Abstract-Nanostructured perovskites with formula LaMO 3 (M = Co, Al) were synthesized by the co-precipitation method and characterized with X-ray Diffraction (XRD), Energy Dispersive X-ray Spectrometry (EDX), X-ray Fluorescence spectrometry (XRF) and Scanning Electron Microscopy (SEM) techniques. The XRD pattern confirmed that all samples are perovskite oxide. Elemental compositions of LaMO 3 were investigated by EDX. The EDX pattern of LaCoO 3 showed the presence of La, Co, and O while La, Al, O and K (as impurity) were detected in LaAlO 3 . SEM micrographs indicated that all perovskite samples were nanosized particles having difference morphologies.

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Synchrotron X-ray absorption of LaCoO3 perovskite

Cited by 128 publications

References 48 publications

Phase transition in Pr0.5Ca0.5CoO3 and related cobaltites

Phase transition in Pr0.5Ca0.5CoO3 and related cobaltites

Spin-state transition in Pr0.5Ca0.5CoO3analyzed by x-ray absorpt

Comparison of Nanocrystalline LaMO3 (M = Co, Al) Perovskite Oxide Prepared by Co-Precipitation Method

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