Abstract
New ferrielectric 0.9Ag0.9Li0.1NbO3–0.1Bi0.5K0.5TiO3 ceramics have been obtained. At room temperature ceramics exhibit perovskite structure, which is close to rombohedral-tetragonal phase boundary. The dielectric properties of ceramics were investigated in wide frequency range from 20 Hz to 1 GHz at temperatures 200 K–750 K. 0.9Ag0.9Li0.1NbO3–0.1Bi0.5K0.5TiO3 ceramics exhibits a first order mixed order-disorder and displacive ferroelectric phase transition at TC = 430 K. The phase transition dynamics is caused by relaxation soft mode at frequencies below 1 GHz and soft phonon mode at higher frequencies. In ferroelectric phase an additional dielectric dispersion is observed, which could be attributed to dipolar glass relaxation.
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