Agglomerate-free BaTiO_3 particles by salt-assisted spray pyrolysis
Agglomerate-free BaTiO_3 particles by salt-assisted spray pyrolysis
复制标题
盐辅助喷雾热解法制备无团聚的BaTiO_3颗粒
DOI：
10.1557/jmr.2002.0466
复制
发表时间：
2002
影响因子：
2.7
通讯作者：
K. Okuyama
中科院分区：
文献类型：
--
作者：
Y. Itoh;I. Lenggoro;S. Pratsinis;K. Okuyama
Optimum conditions for the synthesis of nonagglomerated BaTiO_3 particles by salt-assisted spray pyrolysis (SASP) were investigated. The effect of particle residence time in the reactor and salt concentration on the crystallinity and surface morphology of BaTiO_3 was examined by x-ray diffraction and scanning electron microscopy. Mixtures of a metal chloride or nitrate salt, dissolved in aqueous precursor solutions, were sprayed by an ultrasonic atomizer into a five-zone hot-wall reactor. By increasing the salt concentration or the particle residence time in the hot zone, the primary particle size was increased, and its surface texture was improved compared to BaTiO_3 particles prepared by conventional spray pyrolysis. The SASP-prepared BaTiO_3 crystal was transformed from cubic to tetragonal by simply increasing the salt concentration at constant temperature and residence time. Further thermal treatments such as calcination or annealing are not necessary to obtain nonagglomerated tetragonal BaTiO_3 (200–500 nm) particles with a narrow size distribution. Increasing the carrier gas flow rate and decreasing the residence time in the hot zone resulted in cubic BaTiO_3 particles about 20 nm in diameter.
