Crystal structure of the ferroelectric phase of triglycine sulfate under an electric field

Crystal structure analysis of a triglycine sulfate single crystal under an electric field has been carried out in the ferroelectric phase by X-ray diffraction with anomalous scattering effect. Both crystal structure in positive polarity and that in negative polarity were clarified. The structural change in polarization reversal has been disclosed by indication of flip-flop motion of the hydrogen atoms between oxygen atoms, by rotation of the glycine I group and by changing of the hydrogen bonds connected to nitrogen atoms of the glycines II and III.