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The possibility to stabilize the δ-Bi2O3-type polymorph with high ionic conductivity by doping with Tm2O3 was investigated in this study. Five microcrystalline samples were synthesized at 750°C from α-Bi2O3 and Tm2O3 mixtures with compositions (Bi1–xTmx)2O3, where x=0.04, 0.08, 0.11, 0.14 and 0.20. The XRD, SEM, HRTEM and SAED results showed that the targeted δ-Bi2O3-type single-phase (space group...
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