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Preparation of Uniform Submicrometer Particles of Calcium Titanate and Lead Niobate by Replacement Reactions
Author(s) -
Kim Myung Jin,
Matijević Egon
Publication year - 1994
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.1151-2916.1994.tb07076.x
Subject(s) - ethylenediaminetetraacetic acid , calcination , nitrilotriacetic acid , niobium , lead titanate , inorganic chemistry , chelation , calcium hydroxide , hydroxide , calcium titanate , chemistry , coprecipitation , precipitation , wolframite , titanium , calcium , nuclear chemistry , materials science , tungsten , ceramic , catalysis , ferroelectricity , optoelectronics , dielectric , biochemistry , physics , organic chemistry , meteorology
Uniform submicrometer particles of calcium titanium peroxo‐hydroxide were prepared by adding calcium salts to the solution of peroxotitaniun. species chelated with nitrilotriacetic acid (NTA). Similarly, corresponding leadniobium compodnd of [Pb]/[Nb] = 0.75 was obtained by introducing lead salts into the solution of chelated niobium complex with ethylenediaminetetraacetic acid (EDTA) at pH 3. Calcium ions in solutions containing a mixture of NTA‐chelated Pb and NTA‐chelated Nb complexes also caused the precipitation of lead niobium oxo‐hydroxide of [Pb]/[Nb] = 1.5 at pH 9. The so‐obtained precursor powders were converted on calcination to the corresponding composite oxides. The mechanisms of these reactions were suggested, based on the chemical, thermal, and X‐ray diffraction analyses.