Issue 4, 2010
From the journal:

Green Chemistry

Hydrothermal synthesis of sodium potassium niobate solid solutions at 200 °C†

Albertus D. Handokoab  and  Gregory K. L. Goh*a  

* Corresponding authors

a Institute of Materials Research and Engineering, 3 Research Link, Singapore, Singapore
E-mail: g-goh@imre.a-star.edu.sg
Fax: +65 6874 4657
Tel: +65 6874 8346

b School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore

Abstract

For the first time, a series of sodium potassium niobate solid solutions with compositions around the morphotropic phase boundary (MPB) are hydrothermally synthesized at 200 °C using a simple KOH and NaOH mixture with Nb2O5 as a precursor powder. Rietveld refinement of X-ray diffraction data indicated the presence of a second sodium niobate perovskite phase when the concentration of NaOH (compared to the total hydroxyl ion concentration) is above 11.7%. The presence of the second phase is attributed to the different solubilities of the intermediate potassium and sodium hexaniobate species. It is also found that heat-treating the mixed-phase powders for two hours at a temperature of 800 °C is effective in obtaining the desired single-phase solid solution with compositions near the MPB, thereby opening the way to using hydrothermal synthesis in simplifying the laborious solid-state process.

Graphical abstract: Hydrothermal synthesis of sodium potassium niobate solid solutions at 200 °C

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Article information

DOI
https://doi.org/10.1039/B923840A
Article type
Paper
Submitted
13 Nov 2009
Accepted
13 Jan 2010
First published
20 Feb 2010

Green Chem., 2010,12, 680-687

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Hydrothermal synthesis of sodium potassium niobate solid solutions at 200 °C

A. D. Handoko and G. K. L. Goh, Green Chem., 2010, 12, 680 DOI: 10.1039/B923840A

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