Synthesis and morphology of Ba(Zr0.20Ti0.80)O3 powders obtained by sol–gel method
Barium zirconate titanate, Ba(Zr0.20Ti0.80)O3 (BZT) powders were prepared by sol–gel method. These powders were characterized by thermogravimetric and differential thermogravimetric analyses (TG-DTA), X-ray diffraction (XRD) and microcopy electron transmission (TEM). The decomposition of the precursors was monitored by TG-DTA. XRD patterns reveal that BZT powders heat treated at 800 °C present single phase with perovskite-type cubic structure. TEM micrographs were employed to estimate the average particle size of the BZT powders (≈ 20 nm). The results indicate that the particle size of the BZT powders increases with the increasing of the holding time and aging temperature. The low aging temperature can reduce the agglomeration of the nanopowders. Three polyalcohols were employed as surfactants in sol–gel method: butanol (BTOL), polyethylene glycol (PEG) and polyvinyl alcohol (PVA). It is noted that PEG has a better effect on reducing agglomeration of BZT powders than that of the BTOL and PVA.
KeywordsBarium zirconate titanate Powder Sol–gel Nanometer
This research is supported by the Science and Technology Research Project of Chongqing Education Commission, China (Grant No. KJ091416), the Key Project of Chinese Ministry of Education (Grant No. 209099) and the Program for Excellent Talents in Chongqing University of Science and Technology, China.