The electrical conductivity of new solid electrolytes Eu 2.096 Hf 1.904 O 6.952 and Gd 2 Hf 2 O 7 have been compared with those for different pyrochlores including titanates and zirconates Ln 2+x М 2−x O 7−δ (Ln = Sm-Lu; M = Ti, Zr; x= 0−0.81). Impedance spectroscopy data demonstrate that Eu 2.096 Hf 1.904 O 6.952 and Gd 2 Hf 2 O 7 synthesized from mechanically activated oxides have high ionic conductivity, comparable to that of their zirconate analogues. The bulk and grain-boundary components of conductivity in Sm 2.096 Hf 1.904 O 6.952 (Т synth =1600ºС), Eu 2.096 Hf 1.904 O 6.952 and Gd 2 Hf 2 O 7 (Т synth =1670ºС) have been determined. The highest bulk conductivity is offered by the disordered pyrochlores prepared at 1600ºC and 1670ºC:~1.5 × 10 −4 S/cm for Sm 2.096 Hf 1.904 O 6.952 , 5×10 −3 S/cm for Eu 2.096 Hf 1.904 O 6.952 and 3×10 −3 S/cm for Gd 2 Hf 2 O 7 at780ºС, respectively. The conductivity of the fluorite-like phases at the phase boundaries of the Ln 2+x М 2−x O 7−δ (Ln = Eu, Gd; M = Zr, Hf; x~0.286) solid solutions, as well as that of the high-temperature fluorite-like phases Ln 2+x М 2−x O 7−δ (Ln = Eu, Gd; M = Zr, Hf; x = 0−0.286), is lower than the conductivity of the disordered pyrochlores Ln 2+x М 2−x O 7−δ (Ln = Eu, Gd; M = Zr, Hf; x=0−0.096).
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