| Résumé | To determine the effects of high pressure constraints on the overall behaviour of ferroelectrics (FE) of both the perovskite "soft-mode" and hydrogen-bonded types, the authors have conducted dielectric property measurements to 5.5 GPa have been conducted on single crystals and polycrystalline aggregates of several ferroelectrics (BaTiO₃, Pb(Zr, Ti)O₃, triglycine sulfate, Rochelle salt) for the purpose of determining the effects of high-pressure constraints on the overall behavior of ferroelectrics (FE) of both the perovskite 'soft-mode' and hydrogen-bonded types. It is found that dielectric hysteresis is possible in FE which are under high-pressure conditions of deviatoric stresses and strains in which the FE phase forms part of a composite system. The results indicate that the continued stability of these FE phases is not restricted to a particular polarization mechanism. The results also show that existing FE states occurring as elastic and dielectric inhomogeneities can persist to much higher pressures than expected on the basis of the pressure dependence of isolated and unconstrained FE crystals. |
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