Several outstanding aspects of phase behaviour in the systems (Bi,Ln)2WO6 and (Bi,Ln)2MoO6 (Ln=lanthanide) have been clarified. Detailed crystal structures, from Rietveld refinement of powder neutron diffraction data, are provided for Bi1.8La0.2WO6 (L-Bi2WO6 type) and BiLaWO6, BiNdWO6, Bi0.7Yb1.3WO6 and Bi0.7Yb1.3WO6 (all H-Bi2WO6 type). Phase evolution within the solid solution Bi2−xLaxMoO6 has been re-examined, and a crossover from γ(H)-Bi2MoO6 type to γ-R2MoO6 type is observed at x∼1.2. A preliminary X-ray Rietveld refinement of the line phase BiNdMoO6 has confirmed the α-R2MoO6 type structure, with a possible partial ordering of Bi/Nd over the three crystallographically distinct R sites.
[Show abstract][Hide abstract] ABSTRACT: We have studied the crystallization behavior of Na2O-NaPO3-MVIO3(MVI = Mo, W) high-temperature solutions containing 15 mol % Bi2O3 in the pseudoquaternary systems Na2O-Bi2O3-P2O5-MVIO3 and have established the conditions for the formation of Na3Bi(PO4)2, high-temperature BiPO4, NaBi(MoO4)2, Bi2WO6, and NaMoO2PO4. The compounds identified have been characterized by powder x-ray diffraction and IR spectroscopy.
[Show abstract][Hide abstract] ABSTRACT: BiYWO6 (BYW) oxide solid solution was found to act as a photocatalyst for overall water splitting under visible light when loading cocatalysts. The band gap of BYW was 2.71 eV, and it absorbed visible light up to 470 nm. BYW with RuO2 has the best activity compared to other cocatalysts such as Cr2O3−Pt, Pt, and Au. Under irradiation of λ > 420 nm light, the amounts of the produced hydrogen and oxygen were about 12.3 and 5.6 µmol in 3 h, respectively. This study indicated that the formation of solid solution was the feasible method to adjust the conduction band and valence band to obtain a visible-light-driven photocatalyst.
The Journal of Physical Chemistry C 05/2008; 112(23). DOI:10.1021/jp802537u · 4.77 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Gd2 MoO6: Eu3+ nanofibers and nanobelts have been prepared by a combination method of the sol-gel process and electrospinning. X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy, photoluminescence, and low voltage cathodoluminescence as well as kinetic decays were used to characterize the resulting samples. The results of XRD and FTIR indicate that the Gd2 MoO6: Eu3+ samples have crystallized at 600°C with the monoclinic (α) structure. The SEM and TEM results indicate that the as-formed precursor fibers and belts are uniform and that the as-prepared nanofibers and nanobelts consist of nanoparticles. Gd2 MoO6: Eu3+phosphors show their strong characteristic emission under UV excitation (353 nm) and low voltage electron-beam excitation (3 kV), making the materials have potential applications in fluorescent lamps and field-emission displays.
Journal of The Electrochemical Society 01/2009; 156(8). DOI:10.1149/1.3138702 · 3.27 Impact Factor
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