Sr β-alumina single crystals, Sr1-0.25xMg 1-xAl10+xO17+0.25x (0 ≤ x ≤ 0.41) were prepared in the SrO-MgO-Al2O3 system by a floating zone method. The single crystals had a cleavage plane, which is parallel to (001) plane. The electrical conductivity parallel (σ∥) and perpendicular (σ ⊥) to the cleavage plane had a maximum at x = 0.2. The σ ∥ was almost independent of oxygen partial pressure (PO 2), while σ⊥ showed a PO2-1/6 dependence in the low PO2 range (PO2 = 10 -4∼10-13 Pa). The ionic transport numbers measured by a d.c. polarization method were almost unity in air at 1073 K to 1573 K.
ASJC Scopus subject areas
- 化学 (全般)