Phase separation and local lattice distortions analysis of charge-ordered manganese films La1-CaxMnO3- by Raman spectroscopy

Trotsenko, V.G.; Lahmar, Abdelilah; Lyanguzov, N. V.; Marssi, M. El; Torgashev, V. I.

doi:10.1016/j.spmi.2018.03.005

Cited by 6 publications

(4 citation statements)

References 34 publications

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“…5, the peaks observed in a range 544–563 cm −1 (that split from a broad feature around 500 cm −1 ) behave nearly in the same manner as the ones at 638–644 cm −1 . These peaks were not usually resoluble in the previous studies 9,10,19,20 but the similar features are seen in the lower Pnma space group, such as in La 1−x Ca x MnO 3-δ (555 cm −1 , B 3g (2) out-of-phase bending 17 ), CaMnO 3 (564 cm −1 , B 3g (2) symmetric breathing 42 , La 0.7 Sr 0.3 MnO 3 (562 cm −1 , A g in-phase stretching 43 ). The absence of these peaks in higher symmetry (or at high pressure 34 ) directly links them to stress: the disappearance at lower doses is caused by the decrease of polarisation as symmetry increases.…”

Section: Resultssupporting

confidence: 68%

“…They may also disappear under certain circumstances, i.e . below Curie temperature T c 10 , above Jahn-Teller transition temperature T JT (~710 K) 11 , under magnetic field 37 , or in strongly doped cases 17,38 . Both 486–489 and 638–644 cm −1 bands couple with Jahn-Teller distortion of O 6 cages 13 but the assigned oxygen vibrations are still in question 8,39 .…”

Section: Resultsmentioning

confidence: 99%

“…It is known that under high pressure the O 6 cages can rotate in precession motions against each other, promoting the changes in Mn-O bond lengths and angles that can be probed by Raman. Indeed, there are a number of LMO studies involving Raman as an analytical tool 17–20 , especially where doping concentrations are low 10,21 . Since the internal pressure can be induced by lattice strains, it is reasonable to question whether or not the strains can be engineered (at ambient pressure) and observed simultaneously for LMO.…”

Section: Introductionmentioning

confidence: 99%

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Strain-dependent structure and Raman behaviours in the heavy-ion irradiated manganite at extreme low dose

Hoang¹,

Pham

2019

Sci Rep

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The microstrains in heavy-ion irradiated manganite LaMnO3 can be managed in linear response of irradiation dose, and the corresponding internal pressure up to 8 GPa can be induced by varying doses. The response of structure under stress is studied by means of Density Functional Theory and Lattice Dynamic Calculation. All obtained Raman scattering lines are discussed in details to shed light onto structural changes during ion implantation. There appears new resonance peak at around 550 cm−1, which splits from broad features in the spectra, and attributes to the anti-symmetric vibrations of O6 cages. The blue shift of this peak scales to ~2.4 cm−1 per 1 GPa of stress. Another strong feature showing considerable blue shift is seen in the vicinity of 640 cm−1 and corresponds to one of rhombohedral distortion related soft modes. A weak mode, not frequently reported, is seen at around 420 cm−1 and corresponds to translation-like motions of fixed O6 cages.

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Section: Resultssupporting

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Strain-dependent structure and Raman behaviours in the heavy-ion irradiated manganite at extreme low dose

Hoang¹,

Pham

2019

Sci Rep

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“…Similar conformational changes are observed in Ni 3 [(C 2 H 5 N 5 ) 6 (H 2 O) 6 ](NO 3 ) 6 ·1.5H 2 O . After 9.4 GPa, the intensity of the band around 183 cm –1 increased, which may indicate the occurrence of the lattice distortion. , …”

Section: Resultsmentioning

confidence: 99%

Raman and Synchrotron X-ray Diffraction Studies of Cd₂(C₂H₆N₆)₄(NO₃)·4H₂O under High Pressures

Ding,

Pu,

Jiang

et al. 2024

J. Phys. Chem. C

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Cd 2 (C 2 H 6 N 6 ) 4 (NO 3 ) 4 •H 2 O (CdHATr), a triazole-based energetic compound, was selected for high-pressure research. Employing in situ Raman scattering and synchrotron angle-dispersive X-ray diffraction (ADXRD) technologies, this study investigated CdHATr up to ∼16.3 GPa at room temperature. The vibrational modes of CdHATr at ambient pressure were comprehensively resolved based on the experimental results. Detailed spectral analyses revealed that CdHATr underwent three pressure-induced phase transitions at 0.5, 2.2, and 5.2 GPa. ADXRD experiments confirmed the presence of these phase transitions, as observed in Raman spectral analyses. By analyzing the changes of the vibrational spectra and the lattice parameters under pressure, it is suggested that the first phase transition arises from the deformation of the 3-hydrazino-4-amino-1,2,4-triazole (HATr) ligand, the second phase transition results from the rearrangement of hydrogen bonds, and the third phase transition is caused by the conformational change of the triazole ring. ADXRD results show that CdHATr may experience an abnormal expansion at 0.5 GPa, which is probably caused by the deformation of the HATr ligand. This work contributes to the understanding of the structures of triazole-based energetic compounds under pressure, which will help in the synthesis of new compounds in the future.

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Enhancing energy storage performance in BaTiO3 ceramics via Mg and La co-doping strategy

Alkathy,

Gatasheh,

Zabotto

et al. 2024

J Mater Sci: Mater Electron

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Phase separation and local lattice distortions analysis of charge-ordered manganese films La1-CaxMnO3- by Raman spectroscopy

Cited by 6 publications

References 34 publications

Strain-dependent structure and Raman behaviours in the heavy-ion irradiated manganite at extreme low dose

Strain-dependent structure and Raman behaviours in the heavy-ion irradiated manganite at extreme low dose

Raman and Synchrotron X-ray Diffraction Studies of Cd₂(C₂H₆N₆)₄(NO₃)·4H₂O under High Pressures

Enhancing energy storage performance in BaTiO3 ceramics via Mg and La co-doping strategy

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Phase separation and local lattice distortions analysis of charge-ordered manganese films La1-CaxMnO3- by Raman spectroscopy

Cited by 6 publications

References 34 publications

Strain-dependent structure and Raman behaviours in the heavy-ion irradiated manganite at extreme low dose

Strain-dependent structure and Raman behaviours in the heavy-ion irradiated manganite at extreme low dose

Raman and Synchrotron X-ray Diffraction Studies of Cd2(C2H6N6)4(NO3)·4H2O under High Pressures

Enhancing energy storage performance in BaTiO3 ceramics via Mg and La co-doping strategy

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Raman and Synchrotron X-ray Diffraction Studies of Cd₂(C₂H₆N₆)₄(NO₃)·4H₂O under High Pressures