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Novel Synthesis of SrBi 2 Nb 2 O 9 Powders From Hydroxide Precursors
Author(s) -
Gupta Upendra Nath,
Rao Koteswara,
Pradhan Sivaram,
Jha Ratnesh Kumar,
Muthurajan Harries,
Ravi Venkat
Publication year - 2008
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2008.02182.x
Subject(s) - coprecipitation , materials science , hydroxide , aurivillius , thermogravimetric analysis , calcination , differential thermal analysis , stoichiometry , phase (matter) , bismuth , niobium , analytical chemistry (journal) , mineralogy , precipitation , nuclear chemistry , inorganic chemistry , chemical engineering , diffraction , metallurgy , chemistry , ferroelectricity , biochemistry , physics , optoelectronics , optics , organic chemistry , chromatography , dielectric , engineering , catalysis , meteorology
Simple hydroxide precursors were used for the first time for the synthesis of a typical Aurivillius compound (SrBi 2 Nb 2 O 9 (SBN)) at a low temperature. This method is very advantageous because it circumvents the use of SrCO 3 in the case of conventional ceramics as well in the coprecipitation methods, thereby lowering the formation of the product phase. Commercially purchased strontium hydroxide is mixed thoroughly with freshly precipitated bismuth and niobium hydroxides in a stoichiometric ratio and heated at different temperatures ranging from 100°C to 750°C for 12 h. The sequence of the reaction and evolution of the product phase was monitored by X‐ray diffraction (XRD) studies by recording the XRD for samples calcined at different temperatures. The incipient SBN phase begins to form at temperatures as low as 400°C, and phase formation was complete only at 650°C as revealed by the XRD observations. The differential thermal/thermogravimetric analyses) also corroborate this result. The morphology and average particle size of these powders were investigated by transmission electron microscopy studies.