Low Temperature Preparation of Strontium Barium Niobate Powders by the Aqueous Organic Gel Method

Abstract

Abstract: Sr_xBa_1-xNb₂O₆(x=0.5) ceramic powders were synthesized by the aqueous organic gel routes. The desired
metal cations were chelated in a solution by using citric acid and ethylenediaminetertraacetic acid (EDTA) as the chelating agents. The
thermal decompostion of the metal carboxylate precursor gels was studied by TG/DTA and the products derived from calcinations of the gels at
different temperatures were characterized by XRD and TEM. The results reveal that tetragonal tungsten bronze-type structural SBN with fine
particle size can be achieved at 800℃. The influences of pH and molar ratio of citric acid: Nb cation on the formation of
homogeneous Sr-Ba-Nb precursor gels were also studied. pH=8 used during the preparation of Sr-Ba-Nb precursor gels was determined
by calculation of the conditional formation constant K_cf of Sr-EDTA and Ba-EDTA complexes.

Key words: strontium barium niobate ceramic powders, organic gel method, citric acid, pH value

CLC Number:

TQ174

ZHAO Jiu-Peng,LI Yao,QIANG Liang-Sheng,WANG Biao,ZHANG He-Xin. Low Temperature Preparation of Strontium Barium Niobate Powders by the Aqueous Organic Gel Method[J]. Journal of Inorganic Materials.

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Low Temperature Preparation of Strontium Barium Niobate Powders by the Aqueous Organic Gel Method

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