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Solid‐State Synthesis of LaCoO 3 Perovskite Nanocrystals
Author(s) -
Li Feng,
Yu Xianghua,
Chen Liying,
Pan Hongjun,
Xin Xinquan
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00431.x
Subject(s) - perovskite (structure) , materials science , nanocrystal , calcination , hydroxide , phase (matter) , oxide , chemical engineering , grain size , nanoparticle , solid state , yield (engineering) , solid solution , inorganic chemistry , chemistry , nanotechnology , metallurgy , catalysis , organic chemistry , engineering , biochemistry
A solid‐state reaction process has been developed to synthesize perovskite‐type LaCoO 3 nanocrystals with grain diameters of 15–40 nm. In the first step of the preparation, ∼5 nm composite hydroxide nanoparticles are synthesized by the solid‐state reaction of La(NO 3 ) 3 · n H 2 O and Co(NO 3 ) 2 ·6H 2 O with KOH at ambient temperature. A perovskite‐type rhombohedral LaCoO 3 phase appears at 550°C, after the hydroxide has been calcined at various temperatures. The phase transformation process is complete at ∼800°C, yielding a single‐phase binary oxide. The results indicate that the new process is convenient, inexpensive, and effective for obtaining LaCoO 3 nanocrystals with high yield.