Structural and dielectric properties of KLiMoO4 ceramic

Potassium lithium molybdates (KLiMoO 4 ) ceramic has been prepared by solid state reaction technique. Preliminary structural study suggests the formation of single phase (monoclinic) compound at room temperature. The variation of dielectric constant and loss as a function of temperature (from room temperature to 250°C) at 1 kHz and 10 kHz exhibits dielectric anomaly and sequential phase transitions at T C 1 = 134°C and T C 2 = 48°C respectively. A comparison of various properties of KLi(Mo x W 1 - x )O 4 ; x = 0 [J. Mater Sci. Lett., 16 1807 (1997)], 0.5 [J. Mater. Sci. Lett., 18 501 (1999)] and 1.0 ceramics have also been made. The ferro-paraelectric phase transition (T C 1 ) has been found to be first order Curie-Weiss type.