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Synthesis of Nanocrystalline Lanthanum Strontium Manganite Powder by the Urea–Formaldehyde Polymer Gel Combustion Route
Author(s) -
Prabhakaran Kuttan,
Joseph Jorly,
Gokhale Nitin Madhusudan,
Sharma Suresh Chandra,
Lal Ramji
Publication year - 2006
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.1551-2916.2006.01013.x
Subject(s) - lanthanum manganite , nanocrystalline material , materials science , polymer , inorganic chemistry , calcination , urea formaldehyde , lanthanum , chemical engineering , polymer chemistry , chemistry , organic chemistry , catalysis , adhesive , electrode , layer (electronics) , engineering , electrolyte , composite material , nanotechnology
Nanocrystalline lanthanum strontium manganite (LSM) powder has been synthesized by combustion of a transparent gel obtained by the polymerization of methylol urea and urea in a solution containing La 3+ , Sr 2+ , and Mn 2+ (LSM ions). Chemistry of the transparent urea–formaldehyde (UF) polymer gel formation and structure of the gel have been proposed such that the LSM ions act in between the growing UF polymer chains by interacting through NH, OH, and CO groups by co‐ordination and prevent polymer self‐assembly through inter‐chain hydrogen bonding as evidenced from infrared spectrum. Thermally stable structures formed by the decomposition of UF polymer below 300°C undergo combustion in the presence of nitrate oxidant in a temperature range from 350°–450°C. A perovskite LSM phase has been formed by self‐sustained combustion of the dried gel initiated with little kerosene. The powder obtained after deagglomeration and calcination at 600°C for 2 h has a D 50 value of 0.19 μm, and the particles are aggregates of crystallites 10–25 nm in size.