Zr2SP2O12 has unique negative thermal expansion behavior involving both phase transition- and framework-type mechanisms. The volumetric CTE of α-Zr2SP2O12 is approximately −70 ppm/K during the isosymmetric phase transition in the temperature range of 393–453 K. This value can be improved by decreasing the proportion of sulfur. The minimum volumetric CTE of α-Zr2S0.9P2O12-δ is approximately −108 ppm/K.
- Toshihiro Isobe
- Yuko Hayakawa
- Akira Nakajima
