期刊
MATERIALS RESEARCH BULLETIN
卷 44, 期 4, 页码 831-835出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2008.09.002
关键词
Amorphous materials; Inorganic compounds; Chemical synthesis; Crystal growth; Crystal structure
资金
- National Natural Science Foundation of China [50625208, 20773097]
- Chinese Ministry of Education [106114]
- National Basic Research Program of China [2007CB613302]
- PCSIRT [IRT0547]
Peanut-shaped CaCO3 aggregates, featured of two dandelion-like heads built up from rod-like subunits, have been synthesized via a facile precipitation reaction between Na2CO3 and CaCl2 at ambient temperature in the presence of magnesium ions and ethanol solvent. The as-prepared products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and inductively coupled plasma atomic emission spectrometry (ICP-AES). The results show that a high magnesium concentration and ethanol solvent are necessary for the formation of the unusual peanut-like aggregates. In addition, a multistep phase transformation process from amorphous calcium carbonate (ACC) to a mixture of ACC and calcite and ultimately to calcite and aragonite was observed in the formation process of the unusual structures. A possible mechanism for the formation of the unusual peanut-shape aggregates has been proposed and discussed. (C) 2008 Elsevier Ltd. All rights reserved.
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