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Ferroelectricity was induced in SrTiO₃ by the isotope exchange of ^18O for ^16O. Dielectric measurements confirmed the ferroelectricity of SrTi^18O₃, showing a peak at 23 K. A hysteresis loop in the D vs E measurement and TO phonon observed in the Raman spectra supported the evolution of ferroelectricity in SrTi^18O₃. This is the first demonstration of SrTiO₃ becoming ferroelectric without the application of external fields or the introduction of a random field through cation substitution.
Itoh et al. (Mon,) studied this question.
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