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- W4318068049 abstract "Abstract It is an important subject to improve the temperature coefficient of resonant frequency ( τ f ) and thermal conductivity ( κ ) of microwave dielectric ceramics without reducing the Qf value. Ordered domain engineering was applied to realize the previous objectives in Ba(Mg 1/3 Ta 2/3 )O 3 ceramics. With the increasing ordering degree from 0.835 to 0.897, the optimized Qf value was obtained. Meanwhile, near zero τ f from 11.9 to 5.6 ppm °C −1 was achieved, together with increased κ from 5.5 to 7.6 W m −1 K −1 , and enhanced dielectric strength from 801 to 921 kV cm −1 . The noticeable ordered domain structure with large ordered domains (∼100 nm) and low‐energy domain boundaries was revealed in Ba(Mg 1/3 Ta 2/3 )O 3 . The consequent weakened phonon scattering rises the thermal conductivity. The increased bond covalency and oxygen distortion in ceramics with higher ordering degree were suggested as a cause of enlarged bandgap, which enhanced the dielectric strength. The reduced τ f is dominated by the less “rattling” space of the cations in the ordered state by inducing more positive τ ε . The reduced τ f , optimized thermal conductivity, and Qf value in the present work indicate that the ordered domain engineering could open up a new direction for the optimization of microwave dielectric ceramics." @default.
- W4318068049 created "2023-01-26" @default.
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- W4318068049 date "2023-02-09" @default.
- W4318068049 modified "2023-09-23" @default.
- W4318068049 title "Co‐optimization of microwave dielectric properties in Ba(Mg<sub>1/3</sub>Ta<sub>2/3</sub>)O<sub>3</sub> complex perovskite ceramics through ordered domain engineering" @default.
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- W4318068049 doi "https://doi.org/10.1111/jace.19007" @default.
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