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Title: Low temperature synthesis of microwave dielectric LaAlO3 nanoparticles: effect of chloride on phase evolution and morphology
Authors: Sahu, P K
Behera, S K
Pratihar, S K
Bhattacharyya, S
Keywords: Electron microscopy
Issue Date: 2004
Publisher: Elsevier
Citation: Ceramics International, Vol 30, Iss 7, P 1231-1235
Abstract: A novel chemical synthesis route has been developed to prepare LaAlO3 from low cost inorganic precursors, by gelation–precipitation technique. Phase evolution, morphology, agglomeration and surface area were studied as a function of chloride content and heat treatment temperature. The samples containing chloride crystallized at 1100 °C with the formation of intermediate phases. The product was highly agglomerated and had low surface area. On the contrary, the as-synthesized chloride-free samples crystallized directly to pure LaAlO3 perovskite phase at 600 °C, which is the lowest crystallization temperature achieved so far. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) of chloride-free samples reveal very fine clusters of nanosized spherical particles. The as synthesized and calcined chloride-free samples have a high surface area and are thermally stable upto 1600 °C without decomposition.
Description: Copyright of this article belongs to Elsevier Science Ltd
Appears in Collections:Journal Articles

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