Phase stability, phase transformation kinetics, and conductivity of Y sub 2 O sub 3 -Bi sub 2 O sub 3 solid electrolytes containing aliovalent dopant

Journal Article · Thu Aug 01 04:00:00 EDT 1991 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1991.tb07817.x· OSTI ID:5808957

Fung, K Z; Virkar, A V ^[1]

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1. Utah Univ., Salt Lake City, UT (United States). Dept. of Materials Science and Engineering

This paper reports on single-phase, cubic solid solutions of baseline composition 25% Y{sub 2}O{sub 3}-75% Bi{sub 2}O{sub 3} with an without aliovalent dopants that were fabricated by pressureless sintering of powder compacts. CaO, SrO, ZrO{sub 2}, or ThO{sub 2} was added as an aliovalent dopant. Sintered samples were annealed between 600{degrees} and 650{degrees} C for up to 4000 h. Samples doped with ZrO{sub 2} or ThO{sub 2} remained cubic, depending upon the dopant concentration, even after long-term annealing. By contrast, undoped, CaO-doped, and SrO-doped samples transformed to the low-temperature, rhombohedral phase with {approximately}200 h. Conductivity measurements showed no degradation of conductivity in samples that did not undergo the transformation. In samples that underwent the transformation, a substantial decrease in conductivity occurred. The enhanced stability of the ZrO{sub 2}- and ThO{sub 2}-doped samples is rationalized on the basis of suppressed interdiffusion on the cation sublattice.

• OSTI ID: 5808957
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 74:8; ISSN JACTA; ISSN 0002-7820
• Country of Publication: United States
• Language: English

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