Influence of MoO3 on electrical and microstructural properties of (K0.44Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04)O3

LEANDRO ALDREDO RAMAJO; MIRIAM SUSANA CASTRO; HUMAR ÁVILA; ADOLFO CAMPO-GARCIA; FERNANDO RUBIO-MARCOS; JOSE FERNANDEZ-LOZANDO

Aveiro

Congreso; International Symposium on Applications of Ferroelectrics (Isaf)-European Conference on the Applications of Polar Dielectrics (Ecapd); 2012

Universidad de Aveiro

Microstructure, piezoelectric properties and dielectric behavior of undoped and MoO3-doped lead-free (K0.44Na0.52Li0.04)(Nb0.86-xTa0.10-xSb0.04-x)Mo5/6xO3 (KNL-NTS) was investigated. Samples were obtained by the conventional solid state reaction. X-ray diffraction (XRD) and Raman spectra revealed the formation of a perovskite phase, together with some minor secondary phase which could be assigned by XRD to K3LiNb6O17. XRD also showed that the perovskite evolved from a tetragonal to orthorhombic symmetry with the increasing of doping amount. This behavior was not observed with the increasing in the sintering time. The temperature dependence on real permittivity (ε´) revealed the presence of a diffuse phase transition. This behavior was increased with MoO3 concentration. Also, dielectric relaxation processes were observed at room temperature and were dependent on doping level and sintering time.