Detection of temperature- and stress-induced modifications of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">La</mml:mi><mml:mi mathvariant="normal">Co</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>by micro-Raman spectroscopy

Orlovskaya, Nina; Steinmetz, David; Yarmolenko, Sergey; Pai, Devdas; Sankar, Jag; Goodenough, John B

doi:10.1103/physrevb.72.014122

Cited by 71 publications

(48 citation statements)

References 36 publications

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“…As we known, it has been reported that LaCoO 3 -based perovskites exhibit a nonlinear stress-strain relationship and inelastic deformation behavior [11][12][13][14][15][16][17]. For our investigated La 0.6 Sr 0.4 Co 1−x Fe x O 3 system, at high temperature, the lattice structure of La 0.6 Sr 0.4 Co 1−x Fe x O 3 system is cubic symmetry.…”

Section: Resultsmentioning

confidence: 88%

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Investigation on the low-frequency mechanical properties of La0.6Sr0.4Co1−xFexO3−δ materials

Cao

Kong

et al. 2011

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 88%

“…Recently, the attention of researchers was concentrated on the ferroelasticity of the LaCoO 3 -based system [11][12][13][14][15][16][17][18]. But till now, its origin is still in discussion.…”

Section: Introductionmentioning

confidence: 98%

Investigation on the low-frequency mechanical properties of La0.6Sr0.4Co1−xFexO3−δ materials

Cao

Kong

et al. 2011

Journal of Alloys and Compounds

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“…In this study we are focusing mainly on the LSCO films, therefore, deep discussions of the LAO vibrational properties are necessary and will be reported in the future. After deposition of 40-nm thick LSCO film on the LAO substrate, we can easily distinguish a Raman mode at 695 cm −1 , which is due to the Co-O bending vibration [17]. The 695 cm −1 peak intensity increases with an increase in the annealing temperature from 800˚C to 1000˚C indicating an improvement of the film crystallinity.…”

Section: Microstructure and Surface Morphology Of The Filmsmentioning

confidence: 80%

Metal-Organic Deposition of Epitaxial La0.7Sr0.3CoO3 Thin Films on LaAlO3 Substrates

Daoudi¹,

Othmen²,

Helali³

et al. 2015

CSTA

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La 0.7 Sr 0.3 CoO 3 (LSCO) thin films were epitaxially grown on (001)-single crystalline LaAlO 3 substrates by metal organic deposition. The evolution of the crystallinity of the films having various thicknesses and obtained at various annealing temperatures is investigated using Raman spectroscopy. The Raman mode associated to the Jahn-Teller distortions in the LSCO films is found to be dependent on the annealing temperature and sensitive to the strain state evolution with film thickness. The microstructure and morphology of the obtained films were investigated using transmission electron microscopy observations on cross-sections and atomic force microscopy. The obtained films are characterized by nanocrystalline morphology, with an average roughness around 5 nm. By increasing the annealing temperature to 1000˚C and the film thickness to 100 nm, the electrical resistivity was decreased by several orders of magnitude. The film resistivity reaches approximately 2.7 × 10 −4 Ω•cm in a wide interval of temperature of 77 -320 K, making this material a promising candidate for a variety of applications.

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“…Comparing with the P0 and P1 peaks, the other three internal friction peaks are much broader in Q -1 (T). It has been reported that LaCoO 3 based perovskites exhibit nonlinear stress-strain behavior and non-elastic deformation behavior [7][8][9][10][11][12][13][14]. At high temperatures, the LaCoO 3 based perovskites have an ideal cubic space group of Pm 3 m, and undergo a transition from a cubic to a rhombohedral phase with a space group of R 3 c at a critical temperature, driven by a rotation and a compression of the CoO 6 -octahedra along one of the four individual body diagonals of the cubic unit cell.…”

Section: Resultsmentioning

confidence: 99%

“…Despite the number of publications on the oxygen permeability of the lanthanum cobaltite based perovskites, just a few concerned the mechanical properties of these materials. Recently, a few publications on the ferroelasticity and elastic hysteresis of these materials have appeared [7][8][9][10][11][12][13][14]. Generally, ferroelastic domain switching and phase transformation could be responsible for the nonelastic deformation [10].…”

Section: Introductionmentioning

confidence: 99%

Low-Frequency Mechanical Spectroscopy of Lanthanum Cobaltite Based Mixed Conducting Oxides

Cao

Chen

et al. 2016

Archives of Metallurgy and Materials

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The low-frequency mechanical spectra of lanthanum cobaltite based mixed conducting oxides have been measured using a computer-controlled inverted torsion pendulum. The results indicate that the internal friction spectra and shear modulus depend on the Sr doping contents (x). For undoped samples, no internal friction peak is observed. However, for La0.8Sr0.2CoO3‒δ, three internal friction peaks (P2, P3 and P4) are observed. In addition to these peaks, two more peaks (P0 and P1) are observed in La0.6Sr0.4CoO3‒δ. The P0 and P1 peaks show characteristics of a phase transition, while the P2, P3 and P4 peaks are of relaxation-type. Our analysis suggests that the P0 peak is due to a phase separation and the P1 peak is related to the ferromagnetic–paramagnetic phase transition. The P2, P3 and P4 peaks are associated with the motion of domain walls. The formation of this kind of domain structure is a consequence of a transformation from the paraelastic cubic phase to the ferroelastic rhombohedral phase. With partial substitution of Fe for Co, only one peak is observed, which is discussed as a result of different microstructure.

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Detection of temperature- and stress-induced modifications ofLaCoO3by micro-Raman spectroscopy

Cited by 71 publications

References 36 publications

Investigation on the low-frequency mechanical properties of La0.6Sr0.4Co1−xFexO3−δ materials

Investigation on the low-frequency mechanical properties of La0.6Sr0.4Co1−xFexO3−δ materials

Metal-Organic Deposition of Epitaxial La<sub>0.7</sub>Sr<sub>0.3</sub>CoO<sub>3</sub> Thin Films on LaAlO<sub>3</sub> Substrates

Low-Frequency Mechanical Spectroscopy of Lanthanum Cobaltite Based Mixed Conducting Oxides

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Detection of temperature- and stress-induced modifications ofLaCoO3by micro-Raman spectroscopy

Cited by 71 publications

References 36 publications

Investigation on the low-frequency mechanical properties of La0.6Sr0.4Co1−xFexO3−δ materials

Investigation on the low-frequency mechanical properties of La0.6Sr0.4Co1−xFexO3−δ materials

Metal-Organic Deposition of Epitaxial La&lt;sub&gt;0.7&lt;/sub&gt;Sr&lt;sub&gt;0.3&lt;/sub&gt;CoO&lt;sub&gt;3&lt;/sub&gt; Thin Films on LaAlO&lt;sub&gt;3&lt;/sub&gt; Substrates

Low-Frequency Mechanical Spectroscopy of Lanthanum Cobaltite Based Mixed Conducting Oxides

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Metal-Organic Deposition of Epitaxial La<sub>0.7</sub>Sr<sub>0.3</sub>CoO<sub>3</sub> Thin Films on LaAlO<sub>3</sub> Substrates