NEUTRON-DIFFRACTION STUDIES OF THE RELATIONSHIP BETWEEN TC AND H-BOND DIMENSIONS IN H-ORDERING TRANSITIONS

Neutron-diffraction studies have been carried out on KH2PO4, and other H-bonded materials exhibiting a similar H-ordering phase transition just above the transition temperature Tc, at atmospheric pressure and under applied hydrostatic pressures up to 19 kbar. The results show a systematic relationship between Tc and δ, where δ is the separation between the two sites over which the H atoms are 50:50 disordered above Tc. © 1990, Taylor & Francis Group, LLC. All rights reserved.