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Citation: YIN Li-Song, CHEN Min-Tao, LI Ting, ZHOU Ke-Sheng, GAO Song-Hua. Preparation of Rhombic M Nanoflakes from Dolomites[J]. Acta Physico-Chimica Sinica, ;2007, 23(03): 433-437. doi: 10.3866/PKU.WHXB20070329 shu

Preparation of Rhombic M Nanoflakes from Dolomites

1.
(School of Physics Science and Technology, Central South University, Changsha 410083, P. R. China)

Received Date: 25 September 2006
Available Online: 7 March 2007

Rhombic magnesia flakes with multi interspaces were prepared by calcining magnesium hydrate. The precursor of M could be obtained via acid immersing twice and ammonia depositing from dolomites. The structure, morphology, and composition of M and its precursor were characterized by means of XRD, FT-IR, SEM, and TEM methods. The results indicated that EDTA and PEG molecules were possessed of the effect directing the radial epitaxial growth of Mg(OH)2 flakes. The rhombic magnesia nanoflakes with 10-20 nm in thickness and up to 1 μm2 in area of main surface are single crystal with cubic crystal structure. It grows with a preferred orientation along the [100] direction and inherits the features of radial epitaxial growth of Mg(OH)2. The orientated growth mechanism of the M nanoflakes was studied based on corresponding thermodynamics and dynamics theories.
- Rhombic magnesia flakes;Thermal decomposition;Microscopic morphology;Crystal growth;Effect factors
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