DIELECTRIC STUDY ON RB1-X(NH4)(X)H2PO4 POWDER SYSTEM IN FERROELECTRICPHASE-BOUNDARY REGION

Complex dielectric constants have been measured on the microcrystallin e Rb1-x(NH4)(x)H2PO4 powder system in the concentration range, 0.15 le ss than or equal to x less than or equal to 0.19. Rounded peak in the real dielectric constant curve and the glassy dispersion at low temper ature are observed. Dielectric behavior is largely affected by small c hange of ammonium concentration x near the phase boundary. More asymme tric dielectric loss behaviors are shown in the ferroelectric phase bo undary region than in the pure proton glass region. The broad and asym metric loss dispersion curves observed for x = 0.15 are believed to be related with the remaining ferroelectric clusters.