Study on the Preparation of Fe2Mo3O12 and its Negative Thermal Expansion Property
The title compound Fe2Mo3O12 is prepared using a wet chemical method from aqueous solutions of ferrous nitrate and ammonium molybdate. The various process parameters were optimized to get a suitable precursor, which upon calcination at 700°C for 2 h gave a well crystalline product. The product was characterized by powder XRD to have a monoclinic unit cell of Fe2Mo3O12. Its thermal expansion property was investigated by thermomechanical analyzer and high-temperature XRD. The typical monoclinic to orthorhombic phase transition happened at about 500°C, and Fe2Mo3O12 shows great NTE (macro -13.43×10-6°C-1 and micro -21.77×10-6°C-1) property during the temperature range from 500°C to 800°C.
Jinglong Bu, Pengcheng Wang, Liqun Ai, Xiaoming Sang, Yungang Li
Q. Q. Liu et al., "Study on the Preparation of Fe2Mo3O12 and its Negative Thermal Expansion Property", Advanced Materials Research, Vols. 287-290, pp. 373-376, 2011