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    Nonstoichiometric Control of Tunnel-Filling Order, Thermal Expansion, and Dielectric Relaxation in Tetragonal Tungsten Bronzes Ba<sub>0.5–<i>x</i></sub>TaO<sub>3–<i>x</i></sub> by Fengjuan Pan (1527526)

    Published 2015
    “…In contrast with stoichiometric Ba<sub>6</sub>GaTa<sub>9</sub>O<sub>30</sub>, which shows linear thermal expansion of the cell parameters and monotonic decrease of permittivity with temperature within 100–800 K, these TTB superstructures and slightly nonstoichiometric simple TTB Ba<sub>0.4</sub>TaO<sub>2.9</sub> display abnormally broad and frequency-dependent extrinsic dielectric relaxations in 10<sup>3</sup>–10<sup>5</sup> Hz above room temperature, a linear deviation of the <i>c</i>-axis thermal expansion around 600 K, and high dielectric permittivity ∼60–95 at 1 MHz at room temperature.…”
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