Article ID Journal Published Year Pages File Type
1297495 Solid State Ionics 2006 4 Pages PDF
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.

Related Topics
Physical Sciences and Engineering Chemistry Electrochemistry
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