High temperature electrical characterization of nano-crystalline BaTiO3 synthesized using Ba(NO3)(2) and TiO2

作者：Ansaree Md Jawed^*; Upadhyay Shail^*

来源：Integrated Ferroelectrics, 2016, 176(1): 184-201.

DOI：10.1080/10584587.2016.1252256

• BaTiO3
• thermal analysis
• dielectric properties
• impedance
• ac conductivity

The reaction of Ba(NO3)(2) with TiO2 was studied by thermogravimetric (TG) and differential scanning calorimetric (DSC) techniques up to 1000 degrees C and in nitrogen atmosphere. It was found that the formation of BaTiO3 takes place above 600 degrees C. BaTiO3 powder was prepared by calcination of Ba(NO3)(2) and TiO2 precursor mixture at 800 degrees C for 8h. X-ray diffraction analysis of the synthesized BaTiO3 confirmed the formation of tetragonal phase. Average crystallite size was found to be 44nm, For the electrical and morphological characterization pellets of the obtained powder were sintered at 1000 degrees C for 12 h. Scanning electron micrograph (SEM) exhibits spherical and rod shaped grains. The dielectric constant, dissipation factor, complex plane impedance and ac conductivity of the sintered pellet has been measured in the temperature range of 40-600 degrees C and frequency range of 100 Hz-2 MHz. DC conductivity of the sample was obtained from the impedance data. The conductivities (both ac and dc) and relaxation time () exhibit two regions of temperature dependence, namely region I, which represents (280-450 degrees C) and region II, which governs (450-600 degrees C). Conduction and relaxation in both the temperature regions are explained in terms of hopping of electrons and doubly ionized oxygen vacancies (V-O(center dot center dot)).

• 出版日期2016