新型溶胶-凝胶法制备铌酸锂钠钾纳米粉体

Nano-sized Powders of(Li_(0.06)Na_(0.47)K_(0.47))NbO_3 Synthesized by a Novel Sol-Gel Method

用络合法将Nb2O5转化成可溶性的铌盐来代替价格昂贵的乙醇铌作为铌源,采用溶胶-凝胶法,合成了纳米(Li0.06Na0.47K0.47)NbO3超细粉体.通过XRD、Raman和TEM等技术手段对(Li0.06Na0.47K0.47)NbO3纳米粉体的相结构和微观形貌进行了表征.结果表明,干凝胶在500℃煅烧5 h可制得平均晶粒尺寸为20 nm,纯四方相结构的(Li0.06Na0.47K0.47)NbO3纳米粉体,该合成温度比传统固相法降低了350℃以上.

The(Li0.06Na0.47K0.47)NbO3(LNKN) nanocrystalline powders have been prepared by a novel sol-gel process,in which Nb2O5 was changed into a water-soluble species through the chemical chelation as the Nb source to replace the high price niobium alkoxides.The phase formation,structure and morphological analyses of LNKN powders were investigated by XRD,Raman and TEM.The experimental results show that pure tetragonal phase LNKN powders,which have the average size of about 20 nm,are obtained when the calcination te...