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The solid sodium electrolyte β″‐Al 2 O 3 (Li‐stabilized) was strengthened with additions of tetragonal ZrO 2 (15 vol%). The conductivity of this composite material, measured in an Na/Na cell, was 7.7 Ω· at 300°C. Average values of strength and the critical stress intensity factor were 350 MPa and 4.5 MPa·m 1/2 , respectively, for the sintered composite material.
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Lange et al. (1983) studied this question.
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