Issue 25, 2015

Synthesis of high aspect ratio (K, Na)NbO3 plate-like particles and study on the synthesis mechanism

Abstract

Plate-like NaNbO3 (NN) templates have been successfully synthesized via a two-step molten salt method using K2CO3 as a raw material at 970 °C, which is below the topochemical reaction temperature using Na2CO3 as the raw material (higher than 1000 °C). The synthesized plate-like NN particles have a higher aspect ratio with a thickness of 0.5–1 μm, a width of 5–10 μm and a length of 15–25 μm. In this process, we found that Na2CO3 or K2CO3 plays an important role in removing the (Bi2O2)2+ layers in the substitution process and the final composition is decided by the type of molten salt. Using KCl as molten salt and Na2CO3 or K2CO3 as raw material, the (Bi2O2)2+ layers could be removed by Na2CO3 or K2CO3 and K+ ions can be incorporated into the template during the topochemical reaction and thus (K, Na)NbO3 (KNN) plate-like particles can be fabricated. The growth process is reasonably elucidated by this growth mechanism.

Graphical abstract: Synthesis of high aspect ratio (K, Na)NbO3 plate-like particles and study on the synthesis mechanism

Article information

Article type
Paper
Submitted
14 Apr 2015
Accepted
16 May 2015
First published
20 May 2015

Dalton Trans., 2015,44, 11621-11625

Author version available

Synthesis of high aspect ratio (K, Na)NbO3 plate-like particles and study on the synthesis mechanism

L. Li, Y. Zhang, W. Bai, B. Shen, J. Zhai and H. Chen, Dalton Trans., 2015, 44, 11621 DOI: 10.1039/C5DT01414J

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