The O–D ⋯ O deuteron quadrupole coupling tensors have been determined in the antiferroelectric phase of ND4D2PO4. The results show that the antiferroelectric phase transition in ND4D2PO4 is connected with an order-disorder transition of the deuterons in the O–D ⋯ O bonds and that the Nagamiya model of hydrogen ordering is correct.
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Blinc et al. (1974) studied this question.
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