The influence of the coexistence of ferroelectric and antiferroelectric states on the lead lanthanum zirconate titanate crystal structure

We present results of detailed investigation of the crystal structure of Pb1-3x/2Lax(Zr1-yTiy)O-3 solid solutions. In this letter our attention is concentrated on the series of solid solutions with x = 6% usually referred to as relaxor ferroelectrics. We have established the reasons for the non-cubic crystal structure of these solid solutions at the temperatures below T-C. It is demonstrated that the peculiarities of the properties of Pb1-3x/2Lax(Zr1-yTiy)O-3 depend on the position of a particular solid solution with respect to the hysteresis ferroelectric-antiferroelectric region in the 'Ti-content-temperature' phase diagram.