Thermal Hydrolysis Synthesis and Characterization of Monoclinic Metahewettite CaV₆O₁₆·3H₂O

李兰杰^1,2,3，ZHENG Shili¹，WANG Shaona¹，杜浩¹，ZHANG Yi¹

1. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology,Key Laboratory of Green Process and Engineering,Institute of Process Engineering, Chinese Academy of Sciences2. School of Materials and Metallurgy,Northeastern University3. Research Center of Vanadium and Titanium Technology,Chengde Iron and Steel Group Co. LTD, Hebei Iron and Steel Group Co. LTD

摘 要：Monoclinic metahewettite CaV 6 O 16 ·3H 2 O has been fabricated via thermal hydrolysis of calcium vanadate（Ca 10 V 6 O 25）. High purity calcium vanadate precipitate, featuring column structure with surface area of 8.61 m2/g, can be obtained by reacting sodium orthovanadate（Na 3 VO 4） with calcium oxide at 90 ℃ for 2 h. By acidifi cation of calcium vanadate in hot water at pH of 1.0-3.0, the monoclinic metahewettite crystals with uniform particle distribution, layered structure and nonporous structure can be fabricated. With the well crystallized layered structure, CaV 6 O 16 ·3H 2 O may be a potential cathode material for secondary batteries as well as super capacitor materials.

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