Abstract
Dielectric and thermal expansion studies have been carried out in the relaxor ferroelectric system of PFN 1 − X-PZN X. These compositions show two distinct regions of thermal expansion behaviour from room temperature to 800 K. As the T c of the system increases, the lower expansion region extends. At higher values of x (> 0.7), the pyrochlore phase appears, resulting in higher values of α. Addition of BaTiO 3 suppresses the pyrochlore phase and reduces the magnitude of a in the relaxor region. The width of the low expansion region is also reduced due to the lowering of T c in these compositions.
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