Abstract
The technique of electron diffraction has been used for characterizing the modulation structure in a heavily oxygenated ${\mathrm{La}}_{2}{\mathrm{CuO}}_{4.12}$ sample. Ordering with modulation directions in $\mathrm{bc}$ and $\mathrm{ab}$ plane was observed, and the strong dependence of the $\mathrm{bc}$ plane ordering on temperature and doping level was established. It was found that low temperature and high doping level enhance the ordering and favor a longer modulation period than otherwise. In some regions, a kind of modulation along c axis has also been found and concluded to be an indication of the staging behavior of the interstitial oxygen ions.
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