Characterization and dielectric properties of SrTi_1−xMn_xO₃ceramics

Abstract

SrTi 1%x Mn x O 3 (x = 0, 0.05, 0.10, and 0.15) ceramics can be prepared by sintering SrTi 1%x Mn x O 3 nanopowders, synthesized by a hydrothermal method, at 1,200 °C in air for 3 h. X-ray diffraction (XRD) results for all nanopowders and unannealed ceramics indicate a cubic-perovskite structure with an impurity phase of SrCO 3 in nanopowders of x = 0.10 and 0.15. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) images of nanopowders reveal the agglomeration of cubiclike nanoparticles with particle sizes in the range of 86-105 nm. The dielectric constant (ε$) at room temperature tends to increase upon Mn doping, to the maximum value of 600 at 1 kHz for a ceramic sample of x = 0.05 owing to the homogeneity of grain sizes. Annealing of ceramic samples can also increase the ε$ values through the creation of oxygen vacancies.

Dielectric relaxation in epitaxial films of paraelectric-magnetic SrTiO3-SrMnO3 solid solution

“…For this Ti:Mn ratio, STMO possesses a cubic perovskite structure. 28,29 We observe broad dielectric anomalies centered at 100-200 K, while the films are paramagnetic insulators at all temperatures. We demonstrate that universal relaxation of electrical conductivity produces these anomalies.…”

Synthesis, characterization, and application of ruthenium-doped SrTiO 3 perovskite catalysts for microwave-assisted methane dry reforming

“…The colloidal solution was stirred at room temperature for 10-20 min, and then a solution of 9 M of KOH was added dropwise and kept for 6 h under stirring. The reaction mixture was then transferred to a teflon-lined stainless steel autoclave for hydrothermal treatment at 220°C for 24 h [23]. After cooling down, the precipitates obtained were filtered off, washed with deionized water several times and dried at 80°C for 6 h. The resulting solids were calcined at 800°C for 3 h to obtain the perovskite phase [24].…”