Laser Induced Structural Phase Transformation of Cobalt Oxides Nanostructures

Ravindra, A. V.; Behera, B. C.; Padhan, P.

doi:10.1166/jnn.2014.9023

Cited by 65 publications

(59 citation statements)

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“…With respect to laser‐induced material transformation, the local temperature is definitely a key parameter. In the papers addressing the issue of laser‐induced heating we cite here, local temperatures were actually not determined . This is likely due to technical limitations of spectrometers available.…”

Section: Resultsmentioning

confidence: 99%

“…The heating of Fe 3 O 4 or MgFe 2 O 4 under air can induce phase transformation in hematite (α‐Fe 2 O 4 ) . Finally, CoO nanoparticles were shown to transform into Co 3 O 4 under laser illumination . In the case of partially inverse spinel such as CoFe 2 O 4 , heating can also have a strong impact on cation distribution between tetrahedral and octahedral sites, leading to changes in the Raman spectra .…”

Section: Introductionmentioning

confidence: 99%

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Raman study of Ming porcelain dark spots: Probing Mn‐rich spinels

Pinto

Sciau

Zhu

et al. 2019

J Raman Spectroscopy

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We report on the analysis of dendritic crystals present in the dark spot areas of blue‐and‐white Ming porcelains. Using Raman spectroscopy and scanning electron microscopy equipped with energy dispersive spectrometer, we were able to evidence Mn‐rich spinels. Small Mn‐based spinel crystals being highly sensitive to laser‐induced heating, we identified proper working conditions, avoiding excessive heating and damage. Local temperatures during Raman measurements were deduced from Stokes/anti‐Stokes intensity ratios. By analysing the behaviour of the A1g mode of Mn‐rich spinels, we were able to identify phases ranging from jacobsite‐like to hausmannite‐like compounds. Polarized Raman scattering was shown to provide a convenient means of discriminating between these two types of phases, as they display different symmetries. Inhomogeneities within the dendritic network, as evidenced by micro‐Raman measurements, highlight its gradual formation during the cooling phase of firing, depending of Fe3+ and Mn3+ availability. The presence of Mn‐based spinels is consistent with the use of a local Chinese Mn‐rich cobalt ore during the middle Ming Dynasty.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Raman study of Ming porcelain dark spots: Probing Mn‐rich spinels

Pinto

Sciau

Zhu

et al. 2019

J Raman Spectroscopy

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“…The more stable crystalline structure of this material is the fcc structure (rock salt, space group Fm‐3 m ). The wurtzite phase (hexagonal close‐packed structure) with space group P6 3 mc is 0.27 eV per CoO more unstable than the fcc one, according to lattice energy calculations …”

Section: Resultsmentioning

confidence: 99%

“…have reported the Raman measurement in a standard piece of CoO, registering three peaks, at 515 and 555 cm −1 and a weak one at 683 cm −1 . Ravindra et al have shown on the other hand that fcc CoO nanocrystals show Raman bands around 540 cm −1 (broad band with two maxima at 489 and 540 cm −1 ) and at 690 cm −1 , using in this case a 488 nm emission line. These results are in good agreement to the ones obtained in this work using the 532 and 633 nm laser wavelengths, with the broad bands observed in both cases and associated with nanometer size effects.…”

Section: Resultsmentioning

confidence: 99%

“…Although Raman is a non‐destructible technique, in the case of the face‐centered cubic (fcc) cobalt(II) oxide (CoO), discrepancies in Raman spectroscopy analysis have been reported . These discrepancies can stem from the difficulty in the assignments of the registered Raman bands, for example, due to the ease of this material to be transformed in the oxidized Co 3 O 4 , with spinel crystalline structure, and induced by the Raman laser power itself …”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic CoO–Co₃O₄ crossover using Raman spectroscopy in magnetic octahedron‐shaped nanocrystals

Rivas‐Murias

Salgueiriño

2017

J Raman Spectroscopy

247

152

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This work describes the effect of the laser power and the exposure time on a sample of octahedron‐shaped nanocrystals of cobalt(II) oxide using Raman spectroscopy. Above a certain value of the laser power and exposure time, CoO rock salt sample evolves clearly to the oxidized Co3O4 normal spinel material because of the energy transfer and consequent local heating induced by the applied laser. The analysis of this thermodynamic CoO–Co3O4 crossover in octahedron‐shaped nanocrystals by means of the Raman spectroscopy has been performed. Copyright © 2017 John Wiley & Sons, Ltd.

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Anomalous Thermal Decomposition Behavior of Polycrystalline LiNi_0.8Mn_0.1Co_0.1O₂ in PEO‐Based Solid Polymer Electrolyte

Yang

Zhang

Xue

et al. 2022

Adv Funct Materials

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Replacing liquid electrolytes (LEs) with polymer electrolytes has been considered a promising approach to developing next‐generation lithium‐ion batteries (LIBs) with high energy density and superior safety. Nevertheless, compared with the extensive research on the electrochemical stability of the cathode/polymer electrolyte interfaces, reports on their thermal behaviors are rare to date. Herein, this work systematically investigates the thermal stability of two typical layered oxide cathodes, LiCoO2 (LCO) and LiNi0.8Mn0.1Co0.1O2 (NMC811), with poly(ethylene oxide) (PEO) electrolyte and with carbonate LEs, respectively. It is found that the oxygen release from the cathodes plays a central role in thermal runaway. Replacing the LE with PEO electrolyte can considerably improve the thermal stability of LCO, but surprisingly, deteriorate that of NMC811. The reason is that the surface of single‐crystalline LCO particles can be effectively passivated by the PEO electrolyte during heating, but PEO cannot sufficiently passivate all the primary particles of NMC811 owing to insufficient interface wettability of PEO electrolyte within the polycrystalline secondary NMC811 particles. The findings in this work collectively formulate valuable guidance for improving the safety of polymer‐electrolyte‐based as well as other types of all‐solid‐state lithium‐ion batteries.

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Laser Induced Structural Phase Transformation of Cobalt Oxides Nanostructures

Cited by 65 publications

References 0 publications

Raman study of Ming porcelain dark spots: Probing Mn‐rich spinels

Raman study of Ming porcelain dark spots: Probing Mn‐rich spinels

Thermodynamic CoO–Co₃O₄ crossover using Raman spectroscopy in magnetic octahedron‐shaped nanocrystals

Anomalous Thermal Decomposition Behavior of Polycrystalline LiNi_0.8Mn_0.1Co_0.1O₂ in PEO‐Based Solid Polymer Electrolyte

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Laser Induced Structural Phase Transformation of Cobalt Oxides Nanostructures

Cited by 65 publications

References 0 publications

Raman study of Ming porcelain dark spots: Probing Mn‐rich spinels

Raman study of Ming porcelain dark spots: Probing Mn‐rich spinels

Thermodynamic CoO–Co3O4 crossover using Raman spectroscopy in magnetic octahedron‐shaped nanocrystals

Anomalous Thermal Decomposition Behavior of Polycrystalline LiNi0.8Mn0.1Co0.1O2 in PEO‐Based Solid Polymer Electrolyte

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Thermodynamic CoO–Co₃O₄ crossover using Raman spectroscopy in magnetic octahedron‐shaped nanocrystals

Anomalous Thermal Decomposition Behavior of Polycrystalline LiNi_0.8Mn_0.1Co_0.1O₂ in PEO‐Based Solid Polymer Electrolyte