Application of Graphene Oxide in Synthesis of Sc2W3O12 Powder

作者：Ju Xiang-Wen^*; Wu Ri-Min; Zhou Ya-Zhou; Ma Shuang-Biao; Yang Juan; Cheng Xiao-Nong

来源：Journal of Inorganic Materials, 2015, 30(4): 374-378.

• graphene oxide
• surfactant
• scandium tungstate
• negative thermal expansion

Cross-like Sc2W3O12 powder was synthesized via hydrothermal method by using scandium nitrate, ammonium tungstate hydrate as raw materials and graphene oxide as surfactant. XRD, TG-DSC, Raman and SEM were used to study the influence of graphene oxide on structures and morphologies of the as-prepared product, and the negative thermal expansion properties were detected by TMA. Results show that graphene oxide wraps the grain of Sc2W3O12 and inhibits the growth of some of the original crystal faces, which makes the grain grow to nanorods, then the nanorods assemble into cross-like structure. The pure cross-like Sc2W3O12 powder is obtained by hydrothermal method at 200 degrees C followed by heat treatment at 620 degrees C for 10 min. The TMA data indicate that the thermal expansion coefficient of Sc2W3O12 is -4.75x10(-6) /K from room temperature to 800 degrees C.

• 出版日期2015-4
• 单位江苏大学