Creation of calcite hollow microspheres with attached bundles of aragonite needles by Hua Tang, Jiaguo Yu, Xiufeng Zhao, and Dickon H. L. Ng

Crystal Research and Technology

Cryst. Res. Technol. 43, 473 (2008) - Abstract -

Creation of calcite hollow microspheres with attached bundles of aragonite needles

Hua Tang, Jiaguo Yu, Xiufeng Zhao, and Dickon H. L. Ng*

State Key Laboratory of Advanced Technology for Material Synthesis and Processing, Wuhan University of Technology, No. 122, Luoshi Road, Wuhan City, Hubei Province 430070, PR China
*Department of Physics, Chinese University of Hong Kong, Shatin, Hong Kong, PR China

Keywords	hollow sphere, morphology, aragonite, calcite
PACS	68.55.Jk, 68.55.Ac, 81.10.Aj, 81.10.Dn
DOI	10.1002/crat.200711081

Novel calcite hollow microspheres attached with bundles of aragonite needles have been synthesized via a simple precipitation reaction of aqueous solutions of CaCl₂ and Na₂CO₃ in the presence of Mg²⁺ ions at room temperature. The experimental results revealed that an appropriate molar ratio of [Mg²⁺]/[Ca²⁺], pH value of the solution and aging time are crucial for the formation of the unusual hierarchical CaCO₃ superstructure. A possible growth mechanism is proposed.

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