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Three mol% yttria-stabilized zirconia (denoted by 3Y-TZP) with irregular grain shapes and undulated grain boundaries was prepared by ceria doping. Irregular shaped grains and grain boundary undulation are only formed in 3Y-TZP specimens doped above 8 mol% ceria. However, the formation of irregular grain shapes in 3Y-TZP by ceria doping does not enhance its fracture toughness because of the high stability...
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