Preparation and properties of Zr2MoP2O12 ceramics with negative thermal expansion

Publication date: 15 December 2016
Source:Materials & Design, Volume 112
Author(s): Toshihiro Isobe, Naoto Houtsuki, Yuko Hayakawa, Katsumi Yoshida, Sachiko Matsushita, Akira Nakajima
This study presents a synthetic method for preparing Zr2MoP2O12 powder and its sintered body using a solid-state reaction and a pressureless sintering method, respectively. The optimum heating sequence required to synthesize Zr2MoP2O12 was 873K for 4h, 1173K for 2h and 1323K for 30min. The specific surface area of the obtained powder was 4.2m²/g. Several sintering additives were evaluated to obtain the Zr2MoP2O12 sintered body, and the most stable additive was 2mass% ZnO, which yielded a relative density of >90% following sintering at 1173K for 2h. Young's modulus, Poisson's ratio, Vickers micro-hardness and fracture toughness of Zr2MoP2O12 sintered with 2mass% ZnO were 81GPa, 0.26, 3.1GPa and 0.6MPa·m^1/2, respectively.

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