Results 181 to 190 of about 2,365 (229)

Intergrowth tungsten bronzes

Acta Crystallographica Section A, 1976
A series of phases has been found in the tungsten bronze systems MxWO3 for x ≤ 0.10 when M = K,Rb, Cs, Tl. The crystal structure of one of these was derived from a high-resolution electron micrograph (lattice image) and confirmed by X-ray diffraction analysis.
A. Hussain, L. Kihlborg
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Phosphate tungsten bronzes

Russian Chemical Reviews, 2004
Theoretical and experimental data on the synthesis, structure, properties and applications of phosphate tungsten bronzes accumulated to date are systematised. Attention is focussed on interrelations between structural features and electrophysical properties of these compounds.
Viktor V Skopenko, Vladislav V Lisnyak, Nataliya V Stus, Nikolay S Slobodyanik   +3 more
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Electrochemical properties of tungsten bronzes—I. Hydrogen absorption in sodium tungsten bronzes

Electrochimica Acta, 1973
Abstract Cathodic evolution of hydrogen on the electrodes from sodium tungsten bronzes was studied. Great dependence of cd on time and prepolarization of the electrode is caused by absorption of atomic hydrogen in the electrode; this process is controlled by hydrogen diffusion in bronze.
J. Vondrák, J. Balej
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Indium tungsten bronze

Materials Research Bulletin, 1968
Abstract The preparation of a tungsten bronze of indium, Inx WO3 (0.26 × 0.33) is described. The structure and electronic properties are compared with the isostructural hexagonal bronzes of the larger alkali metals.
A.B. Swanson, J.S. Anderson
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Piezoelectricity in tungsten bronze crystals

Ferroelectrics, 1994
The range of piezoelectric properties available in tungsten bronze crystals reviewed includes both longitudinal and shear mode responses. Specific crystal compositions investigated include Sr1-xBaxNb2O6 (SBN), Ba2-xSrxK1-yNayNb5O15 (BSKNN), K3Li2Nb5O15 (KLN), (Ba, Sr)6Ti2Nb8O30 (BSTN), Sr2-x-CaxNaNb5O15 (SCNN), Sr2KNb5O15 (SKN) and Pb1-xBaxNb2O6 (PBN).
R. R. Neurgaonkar, J. R. Oliver, W. K. Cory, L. E. Cross, D. Viehland   +4 more
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A series of lead tungsten bronzes

Journal of Solid State Chemistry, 1978
Abstract The phases in samples of gross composition Pb x WO 3 (0.01 ⩽ x ⩽ 0.28) heated at temperatures between 973 and 1373°K have been investigated. At all temperatures a nonstoichiometric tetragonal tungsten bronze phase forms for compositions x > 0.18. At temperatures up to 1273°K a series of orthorhombic intergrowth bronzes also forms, but
Thommy Ekström, R.J.D. Tilley
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The reflectance spectra of the tungsten bronzes

Materials Research Bulletin, 1968
Abstract The specular and diffuse reflectance spectra of the sodium tungsten bronzes and the oxides W20058, W18049 have been measured in the range 45,000–5,000 cm −1 . The specular reflectance which is controlled by the free electron concentration has been interpreted in terms of a modified Drude-Zener theory and a contrast drawn between it and the ...
P.G. Dickens, R.M.P. Quilliam, M.S. Whittingham   +2 more
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Oxidation of bismuth-tungsten bronzes

Journal of Solid State Chemistry, 1984
Abstract The oxidation of bismuth-tungsten bronzes at 600 and 950°C has been studied using high-resolution electron microscopy at 200 and 500 kV. At the lower temperature, a topotactic transformation to lamellae of Bi2WO6 in a WO3 matrix was observed but at higher temperature larger crystals were produced, primarily of Bi2W2O9 but with some ...
D.A. Jefferson, M.K. Uppal, David J. Smith   +2 more
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The compressibility of sodium tungsten bronzes

Collection of Czechoslovak Chemical Communications, 1981
The linear compressibility of cubic sodium tungsten bronze NaxWO3 (x = 0.72) is (-8.56 ± 0.54) . 1012 Pa-1; the linear compressibility of type I tetragonal bronze (x = 0.46) is (-20.2 ± 1.3) . 1012 Pa-1 parallel to the a axis and (+4.17 ± 1.9) . 1012 Pa-1 parallel to the c axis.
Jiří Vondrák, Jozef Zámečník
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Superconductivity in hexagonal tungsten bronzes

Physics Letters A, 1967
Abstract It is possible, by etching in various acids, to remove alkali-metal ions from hexagonal phase alkali tungsten bronzes, to change their lattice constants and to increase their superconducting transition temperatures substantially.
J.P. Remeika, T.H. Geballe, B.T. Matthias, A.S. Cooper, G.W. Hull, E.M. Kelly   +5 more
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