Crystal structure analysis of tungsten bronzes β-SrTa2O6 and β′-SrTa2O6 by synchrotron X-ray and neutron powder diffraction

Boron doping effect on the structural, spectral properties and charge transfer mechanism of orthorhombic tungsten bronze β-SrTa2O6:Eu3+ phosphor

“…Although the crystal lattice of β-SrTa 2 O 6 is about 2.5% smaller than β′-SrTa 2 O 6 , Ta–O bond distances and corresponding octahedral volumes of β-SrTa 2 O 6 are large, and it has a relaxed anion sublattice where electrostatic interactions are optimized via octahedral tilting distortions. 8 …”

Li+ conductivity of tungsten bronze LixSr1−0.5xTa2O6 studied by neutron diffraction analysis

“…1). 20 In practice, the Rietveld renement of Li x Sr 1À0.5x Ta 2 O 6 was conducted in a semi-constrained (Fig. 4c), which conrmed the observation from the previous XRD study.…”

“…The model structure of b-SrTa 2 O 6 , which is an orthorhombic TTB, is rather complex and includes a large number of structural variables. 20 Partly because of such a complexity, the site occupancies of Li x Sr 1À0.5x Ta 2 O 6 were rened under the aforementioned constraints.…”

“…The tungsten bronze oxide b-SrTa 2 O 6 was prepared via a solid state reaction using SrCO 3 (Alfa Aesar, 99.95%) and Ta 2 O 5 (Alfa Aesar, 99.95%), with a nal heating temperature of 1673 K. 20 For preparing Li x Sr 1À0.5x Ta 2 O 6 (x ¼ 0.08, 0.17, and 0.25), a mixture of polycrystalline Li 2 CO 3 (Aldrich, 99.99%) and b-SrTa 2 O 6 was heated to 873 K in air for 12 h. Aer heating, the sample was rinsed with distilled water, and dried in air at 328 K for 12 h. 19 The Li concentration of the product sample was controlled by varying the Li : Sr ratio in the starting reactant mixture. The chemical analysis, lattice constants, and ionic conductivity of Li x Sr 1À0.5x Ta 2 O 6 were reported in a previous work.…”

Thermal oxidation of oxynitride films as a strategy to achieve (Sr2Ta2O7)100-x(La2Ti2O7)x based oxide perovskite films with x = 1.65

“…Considering Sr/Ta ratio values close to 0.55, we propose to identify the phase in films to the strontium-deficient Sr2.83Ta5O15 compound (PDF 9012069) belonging to the tetragonal tungsten bronze (TTB) family. Sr2.83Ta5O15 is an isotype to the β'-SrTa2O6 TTB material studied by Kim et al [24]. The indexation of peaks reveals of an orientation of films along their c-axis.…”