High elastic modulus in b-axis-oriented single crystal V2O5

Jachmann, Fabian; Hucho, C.

doi:10.1016/j.ssc.2005.05.027

Cited by 20 publications

(14 citation statements)

References 10 publications

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“…This value of Young’s modulus is much higher than the band (e.g., 5.6–30 GPa) of Young’s modulus data generally reported for undoped vanadium oxide films937555657. In a few instances, however, depending on the specific plane of growth such as along (011)59, (200)60 and b-axis61 relatively higher modulus values e.g., 120 GPa59, 129 GPa60 and 220 GPa61 are also reported for undoped vanadium oxides.…”

Section: Resultsmentioning

confidence: 62%

Nanocolumnar Crystalline Vanadium Oxide-Molybdenum Oxide Antireflective Smart Thin Films with Superior Nanomechanical Properties

Dey

Nayak

Akinlabi

et al. 2016

Sci Rep

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Vanadium oxide-molybdenum oxide (VO-MO) thin (21-475 nm) films were grown on quartz and silicon substrates by pulsed RF magnetron sputtering technique by altering the RF power from 100 to 600 W. Crystalline VO-MO thin films showed the mixed phases of vanadium oxides e.g., V 2 O 5 , V 2 O 3 and VO 2 along with MoO 3 . Reversible or smart transition was found to occur just above the room temperature i.e., at ~45-50 °C. The VO-MO films deposited on quartz showed a gradual decrease in transmittance with increase in film thickness. But, the VO-MO films on silicon exhibited reflectance that was significantly lower than that of the substrate. Further, the effect of low temperature (i.e., 100 °C) vacuum (10 −5 mbar) annealing on optical properties e.g., solar absorptance, transmittance and reflectance as well as the optical constants e.g., optical band gap, refractive index and extinction coefficient were studied. Sheet resistance, oxidation state and nanomechanical properties e.g., nanohardness and elastic modulus of the VO-MO thin films were also investigated in as-deposited condition as well as after the vacuum annealing treatment. Finally, the combination of the nanoindentation technique and the finite element modeling (FEM) was employed to investigate yield stress and von Mises stress distribution of the VO-MO thin films.Vanadium oxides based films and coatings are extensively studied due to both thermochromic 14,15,[17][18][19][20]24,25,31 . The Mo and/or molybdenum oxide doped vanadium oxides are reported to be grown by a multitude of techniques such as magnetron sputtering technique 15 , atmospheric pressure chemical vapour deposition 26 , cathodic

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Section: Resultsmentioning

confidence: 62%

Nanocolumnar Crystalline Vanadium Oxide-Molybdenum Oxide Antireflective Smart Thin Films with Superior Nanomechanical Properties

Dey

Nayak

Akinlabi

et al. 2016

Sci Rep

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“…Due to this architecture of the lattice, the mechanical response is very anisotropic. The modulus in one direction could be as high as 220 GPa, while it cleaves 15 very easily along the ͑001͒ planes at that point that V 2 O 5 is foreseen to be a promising solid lubricant. 16 This is very similar to the case of graphite, which has a high in-plane modulus but low shear modulus between the planes.…”

Section: -mentioning

confidence: 99%

“…The fact that the measured values are low is due to defects in the tubes. Already for single crystals Jachmann and Hucho 15 showed that the elastic modulus is very sensitive to the stoichiometry of the compound. Fateh et al 17 reported that with the increase in the crystallinity of the thin films of V 2 O 5 , Young's modulus can increase from 80 to 130 GPa.…”

Section: -mentioning

confidence: 99%

Mechanical and electronic properties of vanadium oxide nanotubes

Sipos

Duchamp

Magrez

et al. 2009

Journal of Applied Physics

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Vanadium oxide nanotubes with a diameter of 20-100 nm and an aspect ratio of 50-100 were synthesized by hydrothermal method. Young's modulus of 20-80 GPa was obtained by bending measurements of individual nanotubes using an atomic force microscope. Electrical resistivity and thermopower measurements on a large assembly of nanotubes determined the characteristic energies required to put a charge into a polaronic site ͑⌬E g = 0.20 eV͒ and to extract and propagate the polaron between neighboring sites ͑⌬E p = 0.09 eV͒.

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“…The V 2 O 5 (010) single crystal was grown via the floating zone melting method as described in detail in [25]. [26].…”

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confidence: 99%

Methodology for the structural characterisation of V_x O_y species supported on silica under reaction conditions by means of in situ O K‐edge X‐ray absorption spectroscopy

Hävecker

Cavalleri

Herbert

et al. 2009

Physica Status Solidi (b)

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A methodology and its application to silica supported vanadia are presented that allows for a detailed analysis of structural peculiarities of the vanadia species on the surface. We introduce in situ oxygen K‐edge X‐ray absorption spectroscopy (XAS) based on the Auger electron yield (AEY) technique as a characterisation tool to assist vibrational spectroscopy that has been applied extensively in earlier work on this system. The analysis of the O K‐near edge X‐ray absorption fine structure (NEXAFS) allows a clear distinction between separate vanadia, silica and interface contribution in contrast to vibrational spectroscopy with strongly overlapping contributions due to vibrational coupling. Differently coordinated oxygen can be identified in the O K‐NEXAFS spectrum by comparison with theoretical spectra obtained by state of the art density‐functional theory (DFT) calculation. A study of catalysts with different V loadings (0 wt% V, 2.7 wt% V, and 10.8 wt% V) shows that the contributions of silica to the NEXAFS appear in an energy region well separated from the spectral signature of oxygen bound to vanadium. Dehydrated catalysts with high (10.8 wt% V) and low (2.7 wt% V) vanadium loading on silica SBA‐15 show identical NEXAFS under in situ conditions. This finding indicates that independent of the loading a distribution of vanadia species with a very similar molecular structure, including non‐monomeric as well as possibly monomeric configurations and different from crystalline V2O5, is present on this model catalyst. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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High elastic modulus in b-axis-oriented single crystal V2O5

Cited by 20 publications

References 10 publications

Nanocolumnar Crystalline Vanadium Oxide-Molybdenum Oxide Antireflective Smart Thin Films with Superior Nanomechanical Properties

Nanocolumnar Crystalline Vanadium Oxide-Molybdenum Oxide Antireflective Smart Thin Films with Superior Nanomechanical Properties

Mechanical and electronic properties of vanadium oxide nanotubes

Methodology for the structural characterisation of V_x O_y species supported on silica under reaction conditions by means of in situ O K‐edge X‐ray absorption spectroscopy

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High elastic modulus in b-axis-oriented single crystal V2O5

Cited by 20 publications

References 10 publications

Nanocolumnar Crystalline Vanadium Oxide-Molybdenum Oxide Antireflective Smart Thin Films with Superior Nanomechanical Properties

Nanocolumnar Crystalline Vanadium Oxide-Molybdenum Oxide Antireflective Smart Thin Films with Superior Nanomechanical Properties

Mechanical and electronic properties of vanadium oxide nanotubes

Methodology for the structural characterisation of Vx Oy species supported on silica under reaction conditions by means of in situ O K‐edge X‐ray absorption spectroscopy

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Product

Resources

About

Methodology for the structural characterisation of V_x O_y species supported on silica under reaction conditions by means of in situ O K‐edge X‐ray absorption spectroscopy