Dielectric and Conduction Properties of Lu3Nb07 Transparent Ceramic

摘要

The dielectric response and electrical conduction of Lu_3NbO_7 transparent ceramic produced by spark plasma sintering were investigated. Lu_3NbO_7 transparent ceramic exhibited low frequency dielectric dispersion and a peak in dielectric loss, shifting to higher frequency at high temperatures. This indicated space charge polarization and broad relaxation time, confirmed by impedance and modulus spectra. The Nyquist plot shows the dominant grain effect in the electrical conduction. The AC conductivity of Lu_3NbO_7 transparent ceramic is 4.18×10~(-2) S m~(-1) at 1073 K, with an activation energy of 1.30 eV.