Long-wave optical vibrations of V2O5

Bootz, B.; Finkenrath, H.; Franz, Gerhard; Uhle, N.

doi:10.1016/0038-1098(73)90193-2

Cited by 15 publications

(8 citation statements)

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“…8), prepared by heating at 200, 300, and 400ЊC and dispersed in paraffin oil between CsBr plates, match closely those reported in the literature. [33][34][35][36][37]49,50 Small variations in the band peaks originate from the polarization effect, 36,56 which shifts the positions of the peaks away from the TO frequencies to higher values in between the TO and LO modes. IR spectra of films prepared after heating at 300 and 400ЊC do not show any significant differences, agreeing with the emf measurements (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…These conclusions, although in general agreement with XRD data of charged powders, [22][23][24][25][26][27][28] were established from IR spectra of V 2 O 5 films, which unfortunately lack the vibrational bands found in previous studies of sputtered 32 and electrochemically deposited 28 V 2 O 5 films and bulk V 2 O 5 monocrystals. [33][34][35][36][37] For these reasons, we decided to re-examine ex situ IR spectra of V 2 O 5 films under transmission and near-grazing incidence angle (NGIA) conditions. Such measurements have already been used to determine the transversal (TO) and longitudinal (LO) modes of various electrochromic films in various states of charge.…”

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confidence: 99%

“…Accordingly, transmission and NGIA IR reflection-absorption spectra of V 2 O 5 films are given and compared with the TO and LO modes found in previous studies of bulk V 2 O 5 monocrystals. [33][34][35][36][37] XRD and transmission electron microscopy (TEM) together with selected area electron diffractometry (SAED) have been used to obtain information about the preferential orientation of V 2 O 5 films. Namely, V 2 O 5 monocrystals exhibit nearly perfect cleavage along the V 2 O 5 planes, and the XRD spectra of differently prepared V 2 O 5 films showed different degrees of orientation.…”

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confidence: 99%

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Ex situ and In situ Infrared Spectroelectrochemical Investigations of V 2 O 5 Crystalline Films

Šurca

Orel

Dražić

et al. 1999

J. Electrochem. Soc.

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Vanadium oxide (V 2 O 5 ) films were prepared by dip-coating from V-oxoisopropoxide sols and heating at 300ЊC for 1 h. Transmission electron microscopy combined with small area electron and X-ray diffraction revealed that the films consist of disordered V 2 O 5 grains with an orthorombic structure (P mmn ). Electromotor force (emf), cyclic voltammetric (CV), and chronocoulometric measurements, combined with in situ ultraviolet-visible (UV-vis) spectroelectrochemical measurements, revealed similar electrochromic and electrochemical properties with other sputtered and sol-gel derived V 2 O 5 films. IR absorbance and reflectionabsorption spectra, performed at near-grazing incidence angle (NGIA) conditions (80Њ, P-polarized), allowed us to compare the observed transverse optical (TO) and longitudinal optical (LO) frequencies of films with the TO and LO mode frequencies obtained from the dispersion analyses of V 2 O 5 crystalline reflection IR spectra. TO and LO spectra of charged films show that Li ϩ ...O interactions modify the terminal V-O A (vanadyl), bridging V-O B -V, and edge-sharing V-O C stretching frequencies, suggesting that these interactions take place between the oxygens bordering the cavities in which Li ϩ ions are accommodated during charging. The red-frequency shift of the V-O A stretchings [1016 cm Ϫ1 (TO), 1035 cm Ϫ1 (LO)] and the disappearance of the bridging V-O B -V stretching mode [795 cm Ϫ1 (TO), 895 cm Ϫ1 (LO)] can be used as a diagnostic tool to differentiate between films cycled in the safe and unsafe potential regions. A polaron absorption was observed above 2000 cm Ϫ1 in the ex situ TO and in situ NGIA reflectionabsorption (LO) spectra of films charged in the safe potential region.

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Section: Methodsmentioning

confidence: 99%

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Ex situ and In situ Infrared Spectroelectrochemical Investigations of V 2 O 5 Crystalline Films

Šurca

Orel

Dražić

et al. 1999

J. Electrochem. Soc.

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“…The infrared resonances observed by Reshina [5], Gilson et al. [6], and Bootz et al [7] are listed in Table 1. The completest spectrum was reported in [6], where the resonance frequencies were calculated by a Kramers-Kronig analysis.…”

Section: Introductionmentioning

confidence: 99%

Lattice Vibrations of V₂O₅. Determination of TO and LO Frequencies from Infrared Reflection and Transmission

Clauws¹,

Vénnik²

1976

Physica Status Solidi (b)

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“…The zone-centre phonon spectrum of α-V 2 O 5 has been studied by spectroscopic experiments [44][45][46][47][48][49][50] and calculations based on density functional perturbation methods [51][52][53][54] . The calculated stretching modes frequencies in these studies are found to be either overestimated or underestimated depending upon the type of exchange correlation used.…”

Section: Introductionmentioning

confidence: 99%

Anomalous lattice behavior of vanadium pentaoxide (V₂O₅): X-ray diffraction, inelastic neutron scattering and ab initio lattice dynamics

Singh

Gupta

Mishra

et al. 2017

Phys. Chem. Chem. Phys.

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We present the structural and dynamical studies of layered vanadium pentaoxide (V 2 O 5 ). The temperature dependent X-ray diffraction measurements reveal highly anisotropic and anomalous thermal expansion from 12 K to 853 K. The results do not show any evidence of structural phase transition or decomposition of α-V 2 O 5 , contrary to the previous transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS) experiments. The inelastic neutron scattering measurements performed up to 673 K corroborate the result of our X-ray diffraction measurements. The analysis of the experimental data is carried out using ab-initio lattice dynamics calculation. The important role of van der-Waals dispersion and Hubbard interactions on the structure and dynamics is revealed through the abinitio calculations. The calculated anisotropic thermal expansion behavior agrees well with temperature dependent X-ray diffraction. The mechanism of anisotropic thermal expansion and anisotropic linear compressibility is discussed in terms of calculated anisotropy in Grüneisen parameters and elastic coefficients. The calculated Gibbs free energy in various phases of V 2 O 5 is used to understand the high pressure and temperature phase diagram of the compound. Softening of elastic constant (C 66 ) with pressure suggests a possibility of shear mechanism for α to β phase transformation under pressure.

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Long-wave optical vibrations of V2O5

Cited by 15 publications

References 2 publications

Ex situ and In situ Infrared Spectroelectrochemical Investigations of V 2 O 5 Crystalline Films

Ex situ and In situ Infrared Spectroelectrochemical Investigations of V 2 O 5 Crystalline Films

Lattice Vibrations of V₂O₅. Determination of TO and LO Frequencies from Infrared Reflection and Transmission

Anomalous lattice behavior of vanadium pentaoxide (V₂O₅): X-ray diffraction, inelastic neutron scattering and ab initio lattice dynamics

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Long-wave optical vibrations of V2O5

Cited by 15 publications

References 2 publications

Ex situ and In situ Infrared Spectroelectrochemical Investigations of V 2 O 5 Crystalline Films

Ex situ and In situ Infrared Spectroelectrochemical Investigations of V 2 O 5 Crystalline Films

Lattice Vibrations of V2O5. Determination of TO and LO Frequencies from Infrared Reflection and Transmission

Anomalous lattice behavior of vanadium pentaoxide (V2O5): X-ray diffraction, inelastic neutron scattering and ab initio lattice dynamics

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Product

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Lattice Vibrations of V₂O₅. Determination of TO and LO Frequencies from Infrared Reflection and Transmission

Anomalous lattice behavior of vanadium pentaoxide (V₂O₅): X-ray diffraction, inelastic neutron scattering and ab initio lattice dynamics