Theoretical Study of ⁸⁷Rb NMR Spectra in H-Bonded RDP–ADP Mixed Crystals

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Basing on a unified picture changing from ferro- to antiferro-electric phase through a glass state, ⁸⁷Rb NMR–NQR spectra are derived theoretically for each phase of hydrogen-bonded mixed crystals Rb_1−x(NH₄)_xH₂PO₄ and their deuterated systems. The spectra have been compared with the observed NMR signals in rather good agreement. Proton (deuteron) glass structure is discussed from the viewpoint of local resonance techniques.