Title :
Pyroelectric 0.7BaO·0.3SrO·0.5Nb2O5·0.5TiO2 composite ceramics by Powder-Sol method
Author :
Lianwei Shan ; Wang Fengchun ; Wang Cheng ; Wu Ze ; Dong Limin ; Han Zhidong ; Xianyou Zhang
Author_Institution :
Mater. Sci. & Eng. Dept., Harbin Univ. of Sci. & Technol., Harbin, China
Abstract :
0.7BaO·0.3SrO·0.5Nb2O5·0.5TiO2 (SBN/BST) composite ceramics were, for the first time, fabricated using a Powder-Sol (P-S) method with Nb2O5 fine powder suspended in the barium strontium titanate (abbreviated as BST) sol solution. X-ray diffraction (XRD) investigations revealed that the tetragonal tungsten bronze (TTB) phase and perovskite phase were co-present in compositions. Scan electron microscope (SEM) investigations showed that the composite ceramic is homogeneous and fine-grained. The average grain size of BST and SBN phase is 200 nm and 3.0 μm, respectively. The room temperature relative dielectric constant is 2320 for this sample measured at 1 kHz and zero bias. The pyroelectric coefficient of the 0.7BaO·0.3SrO·0.5Nb2O5·0.5TiO2 is found be 70 nc/cm2·°C in the room temperature.
Keywords :
X-ray diffraction; barium compounds; ceramics; composite materials; grain size; niobium compounds; permittivity; powder technology; pyroelectricity; scanning electron microscopy; sols; strontium compounds; suspensions; titanium compounds; BaO-SrO-Nb2O5-TiO2; SEM; X-ray diffraction; XRD; barium strontium titanate sol solution; composite ceramics; frequency 1 kHz; grain size; powder-sol method; pyroelectric coefficient; relative dielectric constant; scanning electron microscopy; suspension; temperature 293 K to 298 K; tetragonal tungsten bronze phase; Barium; Ceramics; Grain size; Niobium; Powders; Strontium; X-ray scattering; Electron microscopy; Electronic Materials; composite ceramics; pyroelectric coefficient;
Conference_Titel :
Strategic Technology (IFOST), 2011 6th International Forum on
Conference_Location :
Harbin, Heilongjiang
Print_ISBN :
978-1-4577-0398-0
DOI :
10.1109/IFOST.2011.6020974
