Studies of the influence of uniaxial pressure on the electric behaviour of Li0.015Na0.985NbO3 ceramics

Lead-free ceramics Li 0.015 Na 0.985 NbO 3 are synthesised using a conventional solid-state process.A single-phase perovskite ceramic structure is identified with an X-ray powder diffraction technique.An energy-dispersive X-ray spectroscopy analysis performed for individual grains of our sample shows a fairly homogeneous distribution of all the elements throughout the grains.The dielectric permittivity  and the loss tangent tan are measured under uniaxial pressure.With increasing pressure, the peak in the (T) curve decreases, becomes diffused, and finally shifts towards lower temperatures T. The value tan increases with increasing uniaxial pressure, while its local maximum also shifts towards lower temperatures.