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An anionic form of tungsten.
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References in periodicals archive ?
Hanuza, "Raman scattering and infra-red spectra of tungstates KLn[(W[O.sub.4]).sub.2] family (Ln = La/Lu)," Journal of Molecular Structure, vol.
Porcher, "Vibrational spectra of double molybdates and tungstates of the type [Na.sub.5] Ln[(X[O.sub.4]).sub.4]," Journal of Physics and Chemistry of Solids, vol.
Generally, AW[O.sub.4] (A = Ba, Sr, Ca, Pb) tetragonal scheelite-type crystals of divalent metal ion tungstate have been of immense interest because of their remarkable properties such as luminescence, nonlinear optical activity, photocatalysis, and scintillation [1-7].
For the formation of tungstate nanomaterials with unique morphology and hierarchical organization, a great number of synthetic techniques, such as hydrothermal method [23, 24], microemulsion, and sol-gel method [25-28], have been developed in the past few years.
Excitonic Emission of Scheelite Tungstates AWO4 (A=Pb, Ca, Ba, Sr), J.
Chang, "Synthesis and luminescence properties of [Ln.sup.3+] ([Ln.sup.3+] = [Er.sup.3+], [Sm.sup.3+])-doped barium lanthanum tungstate Ba[La.sup.2]W[O.sub.7] phosphors," Optical Materials, vol.
Errandonea et al., "High-pressure phase transitions and compressibility of wolframite-type tungstates," Journal of Applied Physics, vol.
Hasegawa et al., "Insulin mimetic effect of a tungstate cluster.
Molybdenum tungstate, [Na.sub.2]Mo[O.sub.4] x 2[H.sub.2]O (98% purity), and propylene oxide were obtained from WINLAB Ltd., UK.
The purification procedure is based on treating the sodium tungstate solution in a mixture of acetic acid and hydrogen peroxide, with subsequent passage through cation exchange resin [17].