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American Mineralogist; October 2006; v. 91; no. 10; p. 1699-1700; DOI: 10.2138/am.2006.2202
© 2006 Mineralogical Society of America
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{alpha}-PbO2-type nanophase of TiO2 from coesite-bearing eclogite in the Dabie Mountains, China—Comment

Jing Chen* and Zhendong Fu

Electron Microscopy Laboratory, School of Physics, Peking University, Beijing 100871, China

Correspondence: * E-mail: jchen{at}pku.edu.cn

In a recent paper, Wu et al. (2005) claimed that they had found nanoscale TiO2 with the {alpha}-PbO2-structure in omphacite from a coesite-bearing eclogite at Shima in the eastern part of the Dabie Mountains, China. However, some results in their paper are questionable. First, the defects that were regarded as intercalated {alpha}-PbO2-type TiO2 lamellas by Wu et al. may be induced during the preparation process of rutile. Second, the SAED pattern in Figures 1b, 2b and 3 from Wu et al. is not due to the diffraction of intercalated {alpha}-PbO2-type TiO2. Third, the lattice parameters reported by Wu et al. are too accurate to be derived only from HRTEM and SAED analyses. In this comment we show evidence for our doubts about their analysis.


Figure 1
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  		FIGURE 1. HRTEM images of crushed rutile exhibiting defects and mechanical twins.

 

Figure 2
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  		FIGURE 2. The simulated diffraction pattern of {alpha}-PbO2-type TiO2 structure with zone axis [100] by WebEMAPS software; Zuo and Mabon 2006 http://emaps.mrl.uiuc.edu/.

 

Key Words: TEM • {alpha}-PbO2-type of TiO2 • mechanical twin • defect






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