Ionic and electronic conductivities,stability and thermal expansion of La10 − x(Si,Al)6O26 ± δ solid electrolytes |
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Affiliation: | 1. Department of Chemistry, Pondicherry University, Pondicherry 605014, India;2. CSIR-Central Electrochemical Research Institute (CSIR-CECRI) −Madras Unit, CSIR-Madras Complex, Taramani, Chennai 600113, India;3. Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India |
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Abstract: | Apatite-type La10 − xSi6 − yAlyO27 − 3x/2 − y/2 (x = 0–0.33; y = 0.5–1.5) exhibit predominant oxygen ionic conductivity in a wide range of oxygen partial pressures. The conductivity of silicates containing 26.50–26.75 oxygen atoms per formula unit is comparable to that of gadolinia-doped ceria at 770–870 K. The average thermal expansion coefficients are (8.7–10.8) × 10− 6 K− 1 at 373–1273 K. At temperatures above 1100 K, silicon oxide volatilization from the surface layers of apatite ceramics and a moderate degradation of the ionic transport with time are observed under reducing conditions, thus limiting the operation temperature of Si-containing solid electrolytes. |
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