Broadband impedance spectroscopic characterization of PbTiO3 crystal grown by spontaneous crystallization from molten oxides

• Published in: Ceramics international Vol. 42; no. 9; pp. 10787 - 10792
• Main Authors: Vinnik, D.A., Zherebtsov, D.A., Gudkova, S.A., Niewa, R., Zabeivorota, N.S., Podgornov, F.V.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.07.2016
• Subjects: A. Inorganic compounds; A. Piezoelectric materials; B. Crystal growth; B. Crystal growth; A. Inorganic compounds; A. Piezoelectric materials
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2016.03.206

Tetragonal lead titanate PbTiO3 single crystals were grown by spontaneous crystallization from a lead and boron oxide flux and investigated by impedance spectroscopy in the broadband frequency range (10−3–5×106Hz) along the crystallographic a and c axes at room temperature. Three polarization relaxation modes as well as electric conductivity processes were revealed. In the ultralow frequency range (<10Hz), the relaxation processes were assigned to the electrode and the ferroelectric domains polarizations. In the high frequency range (105Hz), the relaxation process arises from the crystal lattice polarizations. The electric conduction of the investigated crystals is determined by two fundamental effects – ionic and hopping conductivities. In addition, the anisotropies of relative dielectric constant (300) as well as DC conductivity (1.8×10−9S/m) were estimated.