采用溶胶-凝胶和自蔓延燃烧技术,制备了平均晶粒尺寸约20nm的Ba0.5Sr0.5TiO3(BST)纳米粉体.将纳米粉体压制成形后进行烧结,得到BST陶瓷.采用XRD、SEM、TEM和LCR数字电桥研究了BST的结构、形貌和介电性质.结果表明,干凝胶自蔓延燃烧后,可直接形成分散性好、颗粒尺寸均匀、具有钙钛矿结构的BST纳米粉体.BST陶瓷压片经1250℃烧结2h后获得了致密的结构和相对较大的介电常数.粉体的结晶温度和烧结体的烧结温度均低于传统工艺.很明显,溶胶-凝胶自蔓延燃烧法在纳米材料的制备方面具有明显的技术优势.
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