An electron diffraction and Monte Carlo simulation study of an incommensurate antiferroelectric state in the relaxor ferroelectric Pb₂ScTaO₆

Incommensurate satellite reflections modulating along the <110>* directions have been observed in the electron diffraction patterns of single crystals of the relaxor ferroelectric Pb₂ScTaO₆ (PST). The satellites represent a weak frustrated antiferroelectric state in PST, termed the incommensurate antiferroelectric state.