Abstract
Spectral parameters of the Raman scattering band corresponding to intrinsic vibration ν2(A1) of the PO4 tetrahedron in mixed crystals of K1−xAxDP with various ammonium concentrations are studied in the temperature range 4.2–300 K. Abrupt changes in frequency and half-width of the band are observed during transitions to ordered ferroelectric (x=0.00, 0.02, 0.04, 0.08) or antiferroelectric (x=0.74,0.82) phases. The decrease in the band half-width during ordering indicates the participation of excitations responsible for the corresponding states in relaxation processes. The transition to the structural glass phase (x=0.22, 0.32, 0.53) is not accompanied with sharp changes in the band parameters, but the band half-width at low temperatures is smaller than the expected value for totally disordered paraelectric phase.
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