Tungsten bronze Li+ conductor Li Sr1−0.5Ta2O6 (0 < x ≤ 0.31) prepared by solid state ion exchange

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

“…4c), which conrmed the observation from the previous XRD study. 19 Such a result is attributed mainly to the smaller size of Li + as compared with Sr 2+ . 25 In the neutron Rietveld renement, it was of main interest to examine the occupancies (occ) of A1 and A2 sites.…”

“…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.…”

“…The chemical analysis, lattice constants, and ionic conductivity of Li x Sr 1À0.5x Ta 2 O 6 were reported in a previous work. 19 Powder neutron diffraction (ND) was measured for Li x -Sr 1À0.5x Ta 2 O 6 (x ¼ 0.08, 0.17, and 0.25) in the powder diffractometer, Echidna, at the Australian Nuclear Science Technology Organisation's OPAL facility. The ND data was recorded using z2 g of powder sample loaded in a vanadium can, with l ¼ 2.4395Å over the 2q range, 10-164 , at a step size 0.05 .…”

“…16 Recently, lithiation of the TTB oxide b-SrTa 2 O 6 was accomplished by a solid state ion exchange of Sr 2+ / 2Li + . 19 The ionic conductivity of Li x Sr 1À0.5x Ta 2 O 6 , as a function of Li content, 0 < x # 0.31, was highest for x z 0.17 (s ¼ 10 À5 U À1 cm À1 at 540 K). The scanning and transmission electron microscopic studies strongly suggested that the Li + /Sr 2+ diffusion in Li x Sr 1À0.5x Ta 2 O 6 occurred along the channel direction (c-axis).…”

Characterization of K6Ta10.8O30 Microrods with Tetragonal Tungsten Bronze-Like Structure Obtained from Tailings from the Penouta Sn-Ta-Nb Deposit

“…Although the tunnels are occupied by K ions in this structure, it is still possible to use them for the insertion of Li ions without producing a large alteration of the crystal structure [10]. This makes K6Ta10.8O30 structure a good anode candidate for Li-ion or Na-ion batteries [10][11][12][13][14] and other electrochemical energy storage devices [15] or photocatalysts [8].…”