Dielectric, ferroelectric and conduction behavior of tungsten modified SrBi4Ti4O15 ceramic

Microstructure evolution and dielectric properties of Ce-doped SrBi4Ti4O15 ceramics synthesized via glycine-nitrate process

“…The powder heat-treated at 250°C for 3 h contains SrTiO 3 , Bi 4 Ti 3 O 12 and other unknown phases, which are in accordance with the intermediary products of redox reactions. It was also shown that the SBT layeredperovskite phases were formed after calcining at 400°C and the temperature is much lower than with the conventional solid state processes (800-900°C) [4,17]. Thus, the appropriate conditions for preparation of SrBi 4-x Ce x Ti 4 O 15 powders are calcination at 500°C for 2 h.…”

“…It has attracted much of at-tention due to its promising applications in high temperature piezoelectric devices and high-density capacitors [3]. However, certain problems associated with SBT such as high leakage, difficulty in polarization, volatilization of the bismuth during sintering, and the random arrangement of plate-like crystal grains will lead to a low density and undesirable properties [4]. To overcome these shortcomings, many efforts have been made to improve the ferroelectric and piezoelectric properties of SBT ceramics, including: i) A-or Bsite substitution, ii) application of low temperature synthesis route, iii) formation of intergrowth structure, iv) using grain orientation techniques, etc.…”

An approach for correlating the structural and electrical properties of Zr4+-modified SrBi4Ti4O15/SBT ceramic

“…The mode at 272 cm À1 corresponds to the torsional bending of the TiO 6 octahedra, which is because of B 1g mode, and the modes at 563 and 749 cm À1 correspond to the TiO 6 stretching mode, which corresponds to B 2g and B 3g modes. 12 The mode at 868 cm À1 is probably ascribed to the vibrations of the A-O bond. 25 Compared with the Raman spectra of the SBT ceramic system, it is observed that the modes at 272, 563 and 749 cm À1 remain undeviated up to x # 0.15.…”

“…However, modication at the B-site has mainly been focused on aliovalent cation doping, such as V 5+ and W 6+ , as a substitution for Ti 4+ . 11,12 Moreover, it is noted that the aliovalent cations (V 5+ and W 6+ ) will induce other additional space charges, and can decrease the oxygen vacancy considering the charge compensation mechanism. Consequently, studying the effect of B-site doping by cations with the same valence on the structural and electrical properties of SBT is interesting.…”

Effect of CuO modification on dielectric, ferroelectric and piezoelectric properties of lead-free SrBi4Ti4O15 ceramics

“…For improving the properties of SBTi, researchers have been studied the effect of doping in various site of SBTi with different metal ions. Reports are available with lanthanum [4], praseodymium [5], erbium [6] barium [2] calcium [7], zirconium [8] niobium [9][10][11], vanadium [12], cobalt [13], tungsten [14], and molybdenum [10] doped SBTi systems.…”