Phase diagram of the system of solid solutions Pb_1−X(Li_½La_½)_X(Zr_1-YTi_Y)O₃ in the vicinity of the FE-AFE phase stability boundary. II. phase transitions and induced states

Abstract

Results of the study of phase transitions in the system of solid solutions Pb_1-X(Li_½La_½)_X(Zr_1-YTi_Y)O₃ (PLLZT) at x = 0, 1 under the effect of an electric field are presented. It is shown that there are three regions of Ti-concentration on the “;composition-temperature”; phase diagram. The region of Ti-content from ∼ 12 to ∼ 19% is the most interesting. In this region the succession of phase transitions depends on the prehistory of the specimens: in the absence of an external electric field only the AFE-PE transition takes place, but after the action of the field, the succession of phase transitions FE-AFE-PE arises. Full “;temperature-field”; phase diagrams are constructed.

Key Words:

• Ferroelectric
• antiferroelectric
• phase transition
• induced state
• electric field