Well‐densified Co 3 O 4 ceramics (98.3% of theoretical) have been fabricated by the combined use of hot pressing (800°C/I h/30 MPa) and hot isostatic pressing (880°C/2 h/196 MPa). Their Vickers hardness and fracture toughness are 10.3 GPa and 4.2 MPa·m 1/2 , respectively. They exhibit a high electrical conductivity of 3.35 × 10′ S·cm −1 at 800°C.
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Sakamoto et al. (1997) studied this question.
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