1987 年 56 巻 1 号 p. 200-207
From a microscopic viewpoint on the role of two kinds of hydrogen bonds, antiferroelectric phase transition in NH4H2PO4 is re-examined. The role played by the protons of NH4 ions is explicitely taken into account, and it is shown that the hydrogen bonding effect of NH4 ions with neighbouring oxygens may be renormalized into the effective antiferroelectric interaction between protons which form the network of hydrogen bonds connecting PO4 groups.
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