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The ferroelectric-paraelectric phase transformation in NaNO₂ microcrystals (size about 5 nm) has been investigated by differential thermal analysis. Single-domain particles exhibit spontaneous polarization irrespective of their microsize. The transformation temperature, Tc, of the interior of the particles remains unaffected by their dimension, whereas Tc of the surface monolayer is lowered by a few degrees.
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Marquardt et al. (1982) studied this question.
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