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SPS-produced α-alumina samples are prepared from powders doped with different amounts of Zr4+ and La3+ cations. Zr4+ cations segregate at grain boundaries. m-ZrO2 particles are formed at 570 but not at 280catppm. A β-alumina LaAl11O18 structure is found at 310catppm when the lanthanum grain boundary solubility limit is exceeded (∼200catppm). 100catppm La is sufficient to block the diffusion path across...
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