Dielectric and Tunability Properties of Nanostructured Nd-modified Pb(Zr_xTi_1-x)O₃Thin Films up to Microwave Frequencies

Abstract

Dielectric properties of nanocrystalline Nd-modified Pb(Zr x Ti 1-x )O 3 thin films were studied in frequency range f = 100 Hz -20 GHz. Thin films were prepared by pulsed laser deposition on MgO(100) substrates. Inter-digital electrodes and coplanar waveguide transmission line technique were used for dielectric characterization. In the dielectric function ε r (f, T), two interesting anomalies were found at low frequencies. Diffusive phase transition had relaxor-type behaviour, and an extra dielectric relaxation maxima were found below Curie temperature T C . At higher frequencies above 5 GHz, relative permittivity ε r (f) response was flat up to 20 GHz, and high maximum tunability n r,max = 19% was achieved.