Preparation of compact Li-doped Y2Ti2O7 solid electrolyte

Here we investigated the doping mechanisms and electrical properties of Ba-substituted Bi3.36Mg1.92-xBaxNb2.72O14.36 (BMBN) pyrochlores. Phase-pure BMBN pyrochlores prepared by solid-state reaction were found to crystallise in a cubic structure (Fd3m; No. 227) with their lattice parameters in the range 10.5968( 16) -10.5879(3) Å. The Scanning Electron Microscopy (SEM) analysis revealed that BMBN pyrochlores were composed of irregular shaped grains and their estimated crystallite sizes by both Williamson-Hall and Scherrer methods were in the range 50-75 nm and 60-70 nm, respectively. Neither thermal event nor significant weight loss was observed over the studied temperature range ~30-1000 °C, confirming that BMBN pyrochlores were thermally stable with negligible Bi2O3 loss. The high activation energies in the range 1.18-1.30 eV, as determined by the Arrhenius conductivity plots, showed BMBN pyrochlores to be highly insulating. The dielectric constants, ε' and dielectric losses, tan δ were found in the range 147-183 and 7.9 × 10−2 -9.6 × 10−2 at ~30 °C and 1 MHz. Negative temperature coefficient of capacitances, TCC, in the range (−478) -(−688) ppm/°C were recorded over ~30-300 °C at 1 MHz.

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Preparation of compact Li-doped Y2Ti2O7 solid electrolyte

Cited by 11 publications

References 29 publications

Development and Application of SOFC‐MEA Technology at INER

Development and Application of SOFC‐MEA Technology at INER

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