HRTEM vs. HAADF-STEM

A comparison between HRTEM and HAADF-STEM (Z contrast)

Example

WO₃ segregations in a niobium tungsten oxide.

The positions of the metal atoms are recognizable in the HRTEM image recorded close to Scherzer defocus as dark dots while they always appear with bright contrast in the HAADF-STEM (Z contrast) image. The different brightnesses of dots in the Z contrast image indicate varying occupancies of the corresponding metal position by Nb and W.

Krumeich, Nesper, J. Solid State Chem. 179 (2006) 1857-1863 external page DOI

A useful introduction into theory and practice of TEM and STEM is given on the web site of external page Rodenburg.

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