The effect of pH control on synthesis of Sr doped barium titanate nanopowder by oxalate precipitation method

Sr substituted BaTiO3 (BST) nanopowders were prepared using oxalate co-precipitation methods. During synthesis, oxygen was applied to the oxalate solution in order to control the oxidation states of Ti. Control of pH in the solution results in different crystalline phases of the powders after calcin...

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Bibliographic Details
Published in:Ceramics international 2018-02, Vol.44 (2), p.1420-1424
Main Authors: Eun Jeon, Jae, Han, HyukSu, Ryeol Park, Kyeong, Hong, Yu-Rim, Bo Shim, Kwang, Mhin, Sungwook
Format: Article
Language:English
Subjects:
Nanopowder
Oxalate precipitation
Positive temperature coefficient
Sr-doped barium titanate
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Summary:Sr substituted BaTiO3 (BST) nanopowders were prepared using oxalate co-precipitation methods. During synthesis, oxygen was applied to the oxalate solution in order to control the oxidation states of Ti. Control of pH in the solution results in different crystalline phases of the powders after calcination; pure perovskite BST was obtained in the powder prepared at pH 3 solution, while perovskite BaTiO3 (BTO) and impurities were observed in powders prepared at pH 1 solution. Phase transformation from amorphous to crystalline BST during heat treatment was discussed by different analysis technique. Also, morphology and elemental distribution of the pure BST was investigated.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2017.09.231