Synthesis and characterization of niobium-doped potassium tetragonal tungsten bronzes, KxNbyW1−yO3

Catalytic abatement of trichloroethylene over Mo and/or W-based bronzes

“…Moreover, the band at ca. 290 nm in Mo-free catalyst can be related to the presence of octahedral W(6+) species as in polytungstates [44,45] and in W-based bronzes [46], while the absence of a band at 400 nm confirms the absence of WO 3 crystals [47].…”

Raman and IR studies of TaWO5.5, ASbWO6 (A = K, Rb, Cs, Tl), and ASbWO6·H2O (A = H, NH4, Li, Na) pyrochlore oxides

“…[14,20] Some Raman and IR data were also published for KNbWO 6 and Pb 2 Sc 0.5 Ta 1.5 O 6.5 . [21,22] In the present paper, we report the Raman and IR spectra of a number of oxygen-deficient pyrochlores in order to get deeper insight into the vibrational properties of this interesting group of materials.…”

Nanoscale building blocks in a novel lithium arsenotungsten bronze: Synthesis and characterization

“…The concentration and dynamics of the alkali metal cations in the WO 3 host structure significantly tailor the physical properties, such as tuning superconductivity [8,9]. Substitutions of W 6þ with SOJT susceptible pentavalent (M 5 þ ) Nb and Ta in the A x M 5 þ y W 5 þ xÀ y W 6þ 1À y O 3 bronzes are also known [10,11], where the M 5 þ cation sits in the centroid of the MO 6 octahedron. When x¼y, the compound is fully oxidized and known as bronzoid [1].…”