Journal of Inorganic Materials ›› 2017, Vol. 32 ›› Issue (11): 1128-1132.DOI: 10.15541/jim20160704

• RESEARCH PAPER • Previous Articles     Next Articles

Hydrothermal Synthesis of Whitlockite

LI Guo-Chang, WANG Ping, LIU Chang-Bo   

  1. Department of Material Science and Engineering, Shandong University of Technology, Zibo 255049, China
  • Received:2016-12-29 Revised:2017-03-13 Published:2017-11-20 Online:2017-10-20


Whitlockite was firstly synthesized by a hydrothermal method using CaO, Mg(NO3)2 and H3PO4 as starting materials and then characterized by X-ray diffraction, scanning electron morphology, thermal analysis, and X-ray fluorescence. The variation of molar ratio of Mg/(Ca+Mg) in the precursor solution resulted in different crystallization behaviors of whitlockite during hydrothermal treatment. With the increase of the molar ratio of Mg/(Ca+Mg), crystal morphologies of products varied from hexagonal plate (about 30-50 μm) to spheres (about 3-5 μm) and cell parameters of a and c values decreased gradually. Meanwhile, the content of Mg/(Ca+Mg) in the products increased gradually and reached a high value of 13.6%. It was found that the nucleation and growth of whitlockite were almost completed within 2 h. Ca18Mg2H2(PO4)14 was transformed to Ca18Mg2(PO4)12P2O7 after calcination at temperature ranging from 680℃ to 950℃ due to the dehydration reaction.


Key words: hydrothermal method, synthetic whitlockite, hexagonal plate-like crystal, microsphere

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