塩添加噴霧熱分解法によるチタン酸バリウムストロンチウムナノ粒子の合成

概要

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Optimum conditions for the synthesis of non-agglomerated barium strontium titanate (BST) nanoparticles were examined. The effects of salt concentration, operating temperature, and droplet/particle residence time in the hot zone as a function of carrier gas flow rate and heating zones on particle size, crystallinity, and chemical composition of BST nanoparticles were investigated. Highly crystalline, dense BST nanoparticles in a size range of 17-60nm with a narrow size distribution (σg=1.2) were prepared using a salt-assisted spray pyrolysis (SASP) method without the need for post-annealing or for controlling of initial excess of barium and strontium in the solution, relative to titanium. The particle size decreased with decreasing salt concentration, operating temperature and droplet/particle residence time in the hot zones. The chemical homogeneity of the resulting particles was analyzed using Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES). The chemical composition of the resulting powder completely reflected the initial solution composition. SASP can be used to produce highly crystalline (Ba_<1-x>, Sr_x) TiO_3 (x=0.5) nanoparticles in sizes as small as 30nm in a single step. [Received July 11, 2003; Accepted August 29, 2003]
社団法人日本セラミックス協会の論文
2003-11-01