Ferroelectricity was induced in $\mathrm{SrTiO}{}_{3}$ by the isotope exchange of ${}^{18}\mathrm{O}$ for ${}^{16}\mathrm{O}$. Dielectric measurements confirmed the ferroelectricity of $\mathrm{SrTi}{}^{18}\mathrm{O}{}_{3}$, showing a peak at 23 K. A hysteresis loop in the $D$ vs $E$ measurement and...
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