Application of Graphene Oxide in Synthesis of Sc$lt;inf$gt;2$lt;/inf$gt;W$lt;inf$gt;3$lt;/inf$gt;O$lt;inf$gt;12$lt;/inf$gt; Powder

Cross-like Sc 2 W 3 O 12 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 Sc 2 W 3 O 12 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 Sc 2 W 3 O 12 powder is obtained by hydrothermal method at 200 followed by heat treatment at 620 for 10 min. The TMA data indicate that the thermal expansion coefficient of Sc 2 W 3 O 12 is -4.7510 -6 /K from room temperature to 800.