A Fast, Low-Temperature Synthesis Method for Hexagonal YMnO 3 : Kinetics, Purity, Size and Shape as Studied by In Situ X-ray Diffraction

The reaction mechanisms, phase development and kinetics of the hydrothermal synthesis of hexagonal-YMnO from Y O and Mn O 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 mineralis...

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Published inChemistry : a European journal Vol. 26; no. 42; pp. 9330 - 9337
Main Authors Marshall, Kenneth P, Blichfeld, Anders B, Skjaervø, Susanne L, Grendal, Ola G, van Beek, Wouter, Selbach, Sverre M, Grande, Tor, Einarsrud, Mari-Ann
Format Journal Article
LanguageEnglish
Published Germany 27.07.2020
Subjects
YMnO3
hydrothermal synthesis
synchrotron
in situ
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Summary:The reaction mechanisms, phase development and kinetics of the hydrothermal synthesis of hexagonal-YMnO from Y O and Mn O 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 Y O hydrating to Y(OH) , 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) before Y(OH) fully dehydrated but yielded a very low phase purity of hexagonal-YMnO . Using NaOH mineraliser, no YO(OH) was observed. Dehydration also initiated at a higher temperature in the absence of Mn O . 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-YMnO particles.
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.202000528