Abstract
Abstract Ferroelectric (F) betaine arsenate (BA) and antiferroelectric (AF) betaine phosphate (BP) are structurally very closely related and mixed crystals BA x BP1-x can be grown over the full concentration range. The phase diagrams of several concentrations 0 ≤ x ≤ 1 have been established by investigating dielectric and structural properties by changing external parameters like temperature, hydrostatic pressure, electric bias field, and frequency. This system exhibits interesting pressure-temperature-concentration phase diagrams in which the transition in concentration from an AF to a F phase can be observed with the appearance of some mixed regions and a probably incommensurate phase in the intermediate concentration range. At low temperatures the transition in concentration from a domain to an orientational glass state can be observed besides the appearance of some mixed phases in which different phases coexist. Together with a small review of the most striking features of the system we shall study in...
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