Heat capacity of potassium tungstates K2WnO3n+1(n= 2, 3, 4) at temperatures from 273K to 979K

Chen, Qiyuan; Liu, Shijun; Ping-min, Zhang

doi:10.1006/jcht.1998.0467

Cited by 11 publications

(3 citation statements)

References 5 publications

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“…So this suggests that [010] is the growth direction of the tungsten oxide nanowire in the figure . From the SAED pattern, we reaffirm that [010] is the major growth direction of the nanowires. In fact, 010 with the lattice parameter of ∼0.38 nm is the common growth direction of many tungsten oxide materials; it is governed by the particular lattice structure of the crystals [12,13]. EDX analysis of the sample further showed that it contained W and O only with the molar ratio of W:O = 1:2.78, which is consistent with the XRD result of it being W 18 O 49 (WO 2.72 ).…”

Section: Resultssupporting

confidence: 79%

Tungsten oxide nanowires synthesized by a catalyst-free method at low temperature

Hong

Xie²,

2006

Nanotechnology

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We report the synthesis of tungsten oxide W18O49 nanowires by thermal evaporation at low temperature without using catalysts. By placing tungsten powder in the high temperature zone at 650 °C and tungsten substrate in the low temperature zone at 400 °C of a tube furnace, W18O49 nanowires with diameters of 10–50 nm are produced with high yield. The nanowires extend to 500–1500 nm length, and the cross-sectional shapes are circular or polygonal. The roles of the source material, the pre-oxide layer on the substrate and the temperature of the reactor are also investigated. It is shown that the presence of oxygen on the W surface is essential for tungsten oxide nanowire growth.

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Section: Resultssupporting

confidence: 79%

Tungsten oxide nanowires synthesized by a catalyst-free method at low temperature

Hong

Xie²,

2006

Nanotechnology

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“…Our data on the nonvariant points in the range of 40–80 mol% WO 3 and the melting points of K 2 W 2 O 7 , K 2 W 3 O 10 and K 2 W 4 O 13 (DSC-TG curves in Fig. S7–S9, ESI†) agree well with the thermal analysis data, 6,11,14,60 and not with noticeably higher temperatures obtained by the annealing and quenching method in ref. 17.…”

Section: Resultssupporting

confidence: 89%

Resolving old problems with layered polytungstates related to hexagonal tungsten bronze: phase formation, structures, crystal chemistry and some properties

et al. 2023

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“…Tungsten oxide compounds have attracted research interest as a means to obtain these properties. − It is well-known that there are many stoichiometric compositions of K 2 O and WO 3 in potassium tungstate compounds, including 1:1, 2:3, 1:2, 1:3, and 1:4. Although many attempts have been made to prepare nano/microstructured potassium tungstate crystals at relatively high temperatures , or using the hydrothermal method, there is no research on the 1D and 3D combined structure. Since potassium tungstate, potassium-promoted WO 3 , and WO 3 were reported to be effective for partial oxidation of methane, the 1D and 3D combined structured potassium tungstate will contribute improvement of the property.…”

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confidence: 99%

Fabrication of Combined One-Dimensional and Three-Dimensional Structure of Potassium Tungstate Crystal Layers by Spray Deposition with Polystyrene Colloidal Crystal Templates

Wagata

Fujisawa

Mizuno

et al. 2013

Crystal Growth & Design

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Well-aligned honeycomb-designed layers of potassium tungstate (K0.33WO3.165) were successfully fabricated by spray deposition and microsphere lithography using polystyrene (PS) colloidal crystals as templates. A densely packed monolayer of monodisperse PS microspheres was formed on a silica glass surface, using the Langmuir–Blodgett thin film technique. Subsequently, a (NH4)10W12O41·5H2O-KCl aqueous solution was sprayed as a micromist on the PS templates. While the K0.33WO3.165 crystal layers were synthesized by chemical reaction between W and K sources during the heating, the PS templates were thermally decomposed, generating an inverse opal surface structure where the interstitial space of the densely hexagonal packed PS microspheres had been. Numerous hexagonal rodlike crystals were grown on the honeycomb-designed layer of K0.33WO3.165. X-ray diffraction analysis, energy-dispersive X-ray spectroscopy analyses, and X-ray photoelectron spectroscopy were performed to analyze the combined one-dimensional and three-dimensional honeycomb-designed structure.

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Heat capacity of potassium tungstates K2WnO3n+1(n= 2, 3, 4) at temperatures from 273K to 979K

Cited by 11 publications

References 5 publications

Tungsten oxide nanowires synthesized by a catalyst-free method at low temperature

Tungsten oxide nanowires synthesized by a catalyst-free method at low temperature

Resolving old problems with layered polytungstates related to hexagonal tungsten bronze: phase formation, structures, crystal chemistry and some properties

Fabrication of Combined One-Dimensional and Three-Dimensional Structure of Potassium Tungstate Crystal Layers by Spray Deposition with Polystyrene Colloidal Crystal Templates

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