Sheet superconductivity in : crystal structure of the tetragonal matrix

Aird, A.; Domeneghetti, M. Chiara; Mazzi, F.; Tazzoli, V.; Salje, Ekhard K. H.

doi:10.1088/0953-8984/10/33/002

Cited by 110 publications

(103 citation statements)

References 23 publications

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“…The center of the cube is empty, and hence the structure is easily distorted and tilted upon heating or cooling, with concomitant symmetry lowering. Five different crystal structures of WO 3 have been observed below 1000 K. [27][28][29] At room temperature, the most stable structure is γ-monoclinic with the following lattice parameters: a 1 = 7.306 Å, b 1 = 7.540 Å, c 1 = 7.692 Å, and β = 90.88 • ; note that this unit cell contains eight WO 3 formula units. LSAO substrate has a tetragonal structure with an in-plane lattice constant a = 3.754 Å.…”

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confidence: 99%

Epitaxial growth of high quality WO3 thin films

et al. 2015

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We have grown epitaxial WO3 films on various single-crystal substrates using radio frequency magnetron sputtering. While pronounced surface roughness is observed in films grown on LaSrAlO4 substrates, films grown on Y AlO3 substrates show atomically flat surfaces, as demonstrated by atomic force microscopy and X-ray diffraction (XRD) measurements. The crystalline structure has been confirmed to be monoclinic by symmetric and skew-symmetric XRD. The dependence of the growth modes and the surface morphology on the lattice mismatch are discussed.

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confidence: 99%

Epitaxial growth of high quality WO3 thin films

et al. 2015

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“…The Raman spectrum (Fig. 1C) 3 , whereas their lattice vibrations in the range 70-100 cm -1 , show a difference in the Raman spectra [41][42][43][44]. This is primarily due to the fact that the lattice vibrational bands arise from the (W 2 O 2 ) n chains of WO 3 .…”

Section: Characterizationmentioning

confidence: 96%

Erratum to: Sol–gel synthesis of mesoporous WO3–TiO2 composite thin films for photochromic devices

Djaoued

Balaji

Beaudoin

2013

J Sol-Gel Sci Technol

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Mesoporous WO 3 -TiO 2 composite films were prepared by a sol gel based two stage dip coating method and subsequent annealing at 450, 500 and 600°C. An organically modified silicate based templating strategy was adopted in order to obtain a mesoporous structure. The composite films were prepared on ITO coated glass substrates. The porosity, morphology, and microstructures of the resultant products were characterized by scanning electron microscopy, N 2 adsorption-desorption measurements, l-Raman spectroscopy and X-ray diffraction. Calcination of the films at 450, and 500°C resulted in mixed hexagonal (h) plus monoclinic phases, and pure monoclinic (m) phase of WO 3 , respectively. The degree of crystallization of TiO 2 present in these composite films was not evident. The composite films annealed at 600°C, however, consist of orthorhombic (o) WO 3 and anatase TiO 2 . It was found that the o-WO 3 phase was stabilized by nanocrystalline anatase TiO 2 . The thus obtained mesoporous WO 3 -TiO 2 composite films were dye sensitized and applied for the construction of photochromic devices. The device constructed using dye sensitized WO 3 -TiO 2 composite layer heat treated at 600°C showed an optical modulation of 51 % in the NIR region, whereas the devices based on the composite layers heat treated at 450, and 500°C showed only a moderate optical modulation of 24.9, and 38 %, respectively. This remarkable difference in the transmittance response is attributed to nanocrystalline anatase TiO 2 embedded in the orthorhombic WO 3 matrix of the WO 3 -TiO 2 composite layer annealed at 600°C.

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“…In material sciences of ferroic materials we have examples where small amounts of Na were injected into WO 3 ( Figure 1a and b). As a result, the composition of the twin walls changed from WO 3 to Na x WO 3 or WO 3Àx which are for certain values of x superconducting phases [42][43][44]. Indeed, these twin walls became superconducting while the bulk remained an insulator ( Figure 2).…”

Section: Chemical Doping Of Domain Wallsmentioning

confidence: 99%