A Fast,Low-Temperature Synthesis Method for Hexagonal YMnO3: Kinetics,Purity, Size and Shape as Studied by In Situ X-ray Diffraction |
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| Authors: | Dr Kenneth P Marshall Dr Anders B Blichfeld Dr Susanne L Skjærvø Dr Ola G Grendal Dr Wouter van Beek Prof Sverre M Selbach Prof Tor Grande Prof Mari-Ann Einarsrud |
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| Institution: | 1. Department of Materials Science and Engineering, NTNU—Norwegian University of Science and Technology, Sem Sælands vei 12, 7034 Trondheim, Norway;2. Swiss-Norwegian Beamlines, European Synchrotron Radiation Facility, 71 avenue des Martyrs, CS 40220, 38043 Grenoble Cedex 9, France |
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| Abstract: | The reaction mechanisms, phase development and kinetics of the hydrothermal synthesis of hexagonal-YMnO3 from Y2O3 and Mn2O3 using in situ X-ray diffraction are reported under different reaction conditions with temperatures ranging from 300 to 350 °C, and using 1, 5 and 10 m KOH, and 5 m NaOH mineraliser. Reactions initiated with Y2O3 hydrating to Y(OH)3, which then dehydrated to YO(OH). Higher temperatures and KOH concentrations led to faster, more complete dehydrations. However, 1 m KOH led to YO(OH) forming concurrently with Y(OH)3 before Y(OH)3 fully dehydrated but yielded a very low phase purity of hexagonal-YMnO3. Using NaOH mineraliser, no YO(OH) was observed. Dehydration also initiated at a higher temperature in the absence of Mn2O3. The evolution of Rietveld refined scale factors was used to determine kinetic information and approximate activation energies for the reaction. The described hydrothermal synthesis offers a fast, low-temperature method for producing anisometric h-YMnO3 particles. |
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| Keywords: | hydrothermal synthesis in situ synchrotron YMnO3 |
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