Where are Protons and Deuterons in KHpD1–pCO3? A Neutron Diffraction Study

Francois Fillaux, Alain Cousson
2008 Zeitschrift fur physikalische Chemie (Munchen. 1991)  
The crystals of potassium hydrogen carbonate (KHCO3) and the KDCO3 analogue are isomorphous. They are composed of hydrogen or deuterium bonded centrosymmetric dimers (HCO3-)(2) or (DCO3-)(2). The space group symmetry of KHpD1-pCO3 (p approximate to 0.75) determined with neutron diffraction is identical to those of KHCO3 and KDCO3. This is at variance with a random distribution of H and D nuclei. These crystals are macroscopic quantum systems in which protons or/and deuterons merge into macroscopic states.
doi:10.1524/zpch.2008.5388 fatcat:y5b2d7sgd5hbjd7iu3q73e7fki