K2O·7Nb2O5 crystals
- Practical Electron Microscopy and Database -
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Figure 3494 shows the example of an improved analysis by deconvoluting the high resolution TEM images taken from K2O·7Nb2O5 crystals. The space group is P4bm and unit cell parameters of these materials are a = b = 27.5 Å and c = 3.94 Å. Figure 3494 (a) is the expected image at 0.3 nm spatial resolution of the unit cell projected along the c axis. Figures 3494 (b) and (c) shows two experimental high resolution TEM images, taken in the [001] direction, with different defocus values. The two images are clearly different and their contrasts nearly inverse to each other. By applying the deconvolution technique, described above, to the two images, both the deconvoluted images in Figures 3494 (d) and (e) have similar features and contrasts to those of the expected image in Figures 3494 (a), i.e., they all have four heptagonal channels surrounded by hexagonal, pentagonal, tetragonal, and trigonal channels.

TEM Image Processing and Deconvolution

Figure 3494. Image deconvolution of the high resolution TEM images of K2O·7Nb2O5. a: Expected TEM image at 0.3 nm resolution. b and c: Experimental TEM images with defocus values at about 290 nm and 240 nm, respectively. d and e: Deconvoluted TEM images of b and c, respectively. [1]

 


[1] H. F. Fan, Direct Methods in Electron Crystallography: Image Processing and Solving Incommensurate Structures, Microscopy Research and Technique 46:104–116 (1999).

 

 

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