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Issue 4, 2010
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Hydrothermal synthesis of sodium potassium niobate solid solutions at 200 °C

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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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Publication details

The article was received on 13 Nov 2009, accepted on 13 Jan 2010 and first published on 20 Feb 2010


Article type: Paper
DOI: 10.1039/B923840A
Citation: 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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