Abstract
Electron paramagnetic resonance studies of Rb1-x(NH4)xH2PO4 (x=0, 0.5, 0.8, 0.9, 0.95 and 1.0) containing an AsO44- probe gave a clear indication of the fluctuations between ferroelectric (FE) and antiferroelectric (AFE) regions in the mixed crystals right from room temperature. This has become possible because the AsO44- probe has different 75As hyperfine coupling constants in pure RDP (FE) and APP (AFE) crystals (x=0 and 1). This fluctuation is manifested as the averaging of the 75As hyperfine coupling constant, with compositional dependence of the form (A)mixed crystal= (1-x)AFE+xAAFE. The characteristic fluctuation time T<or=3*10-8 s. The existence of this fluctuation in the mixed crystal also shows up in the washing out of 1H superhyperfine structure from the close protons which is of the order of 30 MHz.
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