Narrow Results

(Ba_0.3Bi_0.7)(Mg_0.05Fe_0.6Ti_0.35)O₃ ceramics were either doped with vanadium or sintered in calcined powder with the same composition. Compared to an undoped ceramic sintered without the calcined powder, both ceramics showed reduced leakage current densities (lower than 1 × 10^-7 A/cm²) and absence of dielectric relaxation behaviors observed in frequency- and temperature-dependent dielectric measurements. The Curie temperatures of both samples were higher than 460°C. The maximum field-induced strain over the applied field, S_max/E_max, of 366 pm/V of the undoped ceramic sintered without the calcined powder increased to 455 and 799 pm/V for the V-doped ceramics and the ceramics sintered with the calcined powder, respectively. The increase was related to a reduced concentration of bismuth vacancy–oxygen vacancy defect dipoles.

Antimony sulfoiodide (SbSI) is a highly efficient energy conversion piezoelectric material. We obtained SbSI doped with tin (II) ions according to the formula Sb${}_{1-x}$Sn_xSI${}_{1-x}$ ($x=0.01$–0.1). This heterovalent doping has been performed by the novel method of synthesis in an aqueous solution. The introduction of tin cations leads to a material Curie point increase of more than 10K. The samples containing 5mol.% of the dopant possess the best piezoelectric properties: piezomodule $d_{33}\sim 750$pC/N, dielectric constant at a frequency of 1kHz — 1758, dielectric loss tangent — 0.054, and piezosensitivity — 50mV×m/N. Thus, tin-doped SbSI is a promising material for highly efficient electromechanical transducers and sensors.