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The temperature-pressure phase diagram was determined for a crystal of squaric acid which consists of molecular sheets of [O₄{O}₄]^2- skeletons and intervening protons. Under hydrostatic pressures, the paraelectric phase composed of the polar (C₁ₕ-distorted) molecules is realized even near 0 K due to a joint quantum motion of the protons and deforming molecular skeletons. Further application of pressure causes a disappearance of the {π}-bond alternation of the constituent molecule at all temperatures caused by enhanced motion of the protons.
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Moritomo et al. (1991) studied this question.
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