Dielectric Dispersion in NaVO₃ Single Crystal

Abstract

Large transparent single crystals of NaVO 3 were grown by the Czochralski method. The complex dielectric constant was measured in a frequency range between 100 Hz and 3 MHz from room temperature to 500°C. Two dielectric dispersions were found. A remarkable dispersion observed only along the c -axis obeys the formula of the Debye-type with a single relaxation time. The temperature dependence of relaxation time is summarized as τ( T )=τ 0 exp ( E / k T ), where E =0.67 eV and τ 0 =3.0×10 -12 sec, respectively. This relaxation phenomenon may be due to impurities and vacancies.