水素結合の競合とIce Ruleの役割 Role of Ice Rule and Competition among Hydrogen Bonds
In view of the importance of the ice rule imposed on the proton configurations in hydrogen-bonded crystals, a cluster theory is developed and applied to the phase transitions in the mixed crystals of ferroelectrics and antiferroelectrics Rb<SUB>1-x</SUB> (NH<SUB>4</SUB>) <SUB>x</SUB>H<SUB>2</SUB>PO<SUB>4</SUB>. At low temperatures, protons rearrange themselves to fulfill the ice rule condition, and produce the glass structure resulting from the competition between two kinds of proton ordering. It is shown that the correlation among hydrogen bonds under the ice rule constraint leads the system to the new ordered state.
日本結晶学会誌 40(1), 19-25, 1998-02-28
The Crystallographic Society of Japan