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Phase Stability, Phase Transformation Kinetics, and Conductivity of Y 2 O 3 —Bi 2 O 3 Solid Electrolytes Containing Aliovalent Dopants
Author(s) -
Fung Kuan Zong,
Virkar Anil V.
Publication year - 1991
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1991.tb07817.x
Subject(s) - dopant , materials science , annealing (glass) , sintering , conductivity , doping , analytical chemistry (journal) , electrical resistivity and conductivity , phase (matter) , solid solution , electrolyte , mineralogy , metallurgy , chemistry , electrode , optoelectronics , organic chemistry , chromatography , electrical engineering , engineering
Single‐phase, cubic solid solutions of baseline composition 25% Y 2 O 3 —75% Bi 2 O 3 with and without aliovalent dopants were fabricated by pressureless sintering of powder compacts. CaO, SrO, ZrO 2 , or ThO 2 was added as an aliovalent dopant. Sintered samples were annealed between 600° and 650°C for up to 4000 h. Samples doped with ZrO 2 or ThO 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 within ∼ 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 2 ‐ and ThO 2 ‐doped samples is rationalized on the basis of suppressed interdiffusion on the cation sublattice.