Optical phonon modes and infrared dielectric properties of monoclinic CoWO₄microcrystals

Co/Ni-polyoxotungstate photocatalysts as precursor materials for electrocatalytic water oxidation

“…3 ). 91 The most intense band located at 885 cm −1 corresponds to the stretching W–O vibration and is shifted to higher frequencies upon mixing with Ni. The small band around 929 cm −1 can be attributed to the symmetric stretching mode of the terminal (W O) bond.…”

High-temperature antiferroelectric and ferroelectric phase transitions in phase pure LaTaO 4

“…The sample surfaces were plane and smooth enough in many regions within the observation area to give quite appropriate spectra. Far-infrared measurements were carried out in a Centaurus microscope adapted according to procedures described previously [14,15]. Vibrational data (50-700 cm −1 ) were collected using a Si-beamsplitter and a Sibolometer detector, by averaging 128 scans.…”

Lattice distortion derived catalytic degradation in multi-oxide cathode catalyst for Li–oxygen batteries

“…39 In-plane deformation mode of W–O bonds are observed at 407 cm −1 . 40,41 The peak at 193 cm −1 can be related to interchain deformation of torsion modes. 40,42 Further, the Raman peaks belonging to [WO 6 ] distorted octahedron decrease for the CoWO-7 sample, indicating distortion relaxing involving octahedral [WO 6 ]–[CoO 6 ] clusters in the wolframite structure when sintered at a higher temperature.…”

“…40,41 The peak at 193 cm −1 can be related to interchain deformation of torsion modes. 40,42 Further, the Raman peaks belonging to [WO 6 ] distorted octahedron decrease for the CoWO-7 sample, indicating distortion relaxing involving octahedral [WO 6 ]–[CoO 6 ] clusters in the wolframite structure when sintered at a higher temperature. As it has also been reported that a weak Raman stretching mode indicates a less distorted structure.…”