Neutron Scattering Study on the Structural Phase Transition in KDCO₃

Critical behavior of KDCO3 from 2H and 39K single crystal NMR

“…This would be consistent with a picture of dimer ordering which comes from interactions within dimers (all dimers are arranged in parallel planes) mediated by a strain field, [23] and our observation of a logarithmic singularity. But to decide which explanation is valid deserves further investigation.…”

“…[22] Neutron experiments indicate that the local symmetry is already broken in the HT phase of KDCO 3 . [23,24] These results strongly suggest an order/disorder type phase transition, where the HT symmetry derives from time and ensemble averaging. For such a model, the two dimer sites already exist in the HT phase ( Fig.…”

NMR study of the order–disorder phase transitions of KHCO3 and KDCO3 single crystals

“…The changes of the resonance lines for 1 transitions the structure changes from that of the roomtemperature phase (monoclinic, space P2 1 /a) to that of the high-temperature phase (monoclinic, space group C2/m). We have investigated the isotope effect on the phase transitions of KHCO 3 and KDCO 3, and the difference of the two crystals shows the discrepancy of the transition temperature.…”

“…These systems provide tools for investigating the properties of hydrogen bonding, which plays an important role in various aspects of the natural sciences, including the life sciences [1]. There has also been considerable interest in the order-disorder phase transitions of these materials.…”

Pressure Response on Hydrogen Bonds in Potassium Hydrogen Carbonate and Sodium Hydrogen Carbonate

“…KHCO 3 undergoes a pressure-induced structural change at 2.8 GPa and room temperature [7], whereas no phase transition has been found for NaHCO 3 up to 11 GPa. In addition, even at ambient pressure, a phase transition was reported at 319 K for KHCO 3 [8,9].…”