Growth mechanism of lanthanum phosphate particles by continuous precipitation

摘要: Abstract Lanthanum phosphate, a matrix material of green phosphor, was synthesized by using T-shaped mixer-type tubular reactor which enabled continuous precipitation the particles having uniform diameter. Effects precursor concentrations and residence time on yield, number density, diameter, aspect ratio were investigated for discussing particle growth mechanism. Particularly, in order to observe initial stage growth, varied over six orders ranging from 0.4 ms 120 s employing tubes 250 μ m inner diameter newly developed fast sampling device. The lanthanum phosphate yield proportional concentration product precursors, ion dihydrogen ion, at inlet reactor, while density 2.3th power product. formation practically completed within 0.01 s. Then, grew slowly up few micrometers radiating acicular crystallites.