Schmidt, V. Hugo2016-04-152016-04-151987-10-15Hugo Schmidt, V. “ Comment on ‘The Role of Hydrogen Bonds in Antiferroelectricity of NH 4 H 2 PO 4 ’ .” Journal of the Physical Society of Japan 56, no. 10 (October 15, 1987): 3752–3753. doi:10.1143/jpsj.56.3752.0031-9015https://scholarworks.montana.edu/handle/1/9686From a microscopic viewpoint on the role of two kinds of hydrogen bonds, antiferroelectric phase transition in NH 4 H 2 PO 4 is re-examined. The role played by the protons of NH 4 ions is explicitely taken into account, and it is shown that the hydrogen bonding effect of NH 4 ions with neighbouring oxygens may be renormalized into the effective antiferroelectric interaction between protons which form the network of hydrogen bonds connecting PO 4 groups.Article