Structural Evolution and Electrical Properties of BaTiO3 Doped with Gd3+
AUTOR(ES)
Hernández Lara, Juan Pablo, Pérez Labra, Miguel, Barrientos Hernández, Francisco Raúl, Romero Serrano, Jose Antonio, Ávila Dávila, Erika Osiris, Thangarasu, Pandiyan, Hernández Ramirez, Aurelio
FONTE
Mat. Res.
DATA DE PUBLICAÇÃO
02/03/2017
RESUMO
BaTiO3 doped with Gd3+ (Ba1-xGdxTi1-x/4O3) was synthesized using the solid-state reaction method with x = 0.001, 0.003, 0.005, 0.01, 0.05, 0.1, 0.15, 0.20, 0.25, 0.30, and 0.35 Gd3+ (wt. %). The powders were decarbonated at 900 ºC and sintered at 1400 ºC for 8 hours. The tetragonality of the synthesized Gd3+-doped BaTiO3 particles was analyzed. XRD patterns and Raman spectra revealed that the crystal phase of the obtained particles was predominately tetragonal BaTiO3; the intensity of the Raman bands at 205 cm−1, 265 cm−1, and 304 cm−1 decreased when Gd3+ was increased. A secondary phase (Gd2Ti2O7) was found when the Gd3+ content was higher than 0.15 wt. %. The capacitance of the sintering pellets was measured at 1 kHz; these values were used to calculate the relative permittivity, the maximum permittivity values were recorded for the samples with x = 0.001, 0.005, and 0.1.
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