Synthesis of hexagonal YMnO3 from precursor obtained by the glycine–nitrate process
| Autor: | Jovan Blanusa, Matúš Mihalik, Vojislav Spasojević, Marián Mihalik, Vladan Kusigerski, Aboalqasim Alqat, Zohra Gebrel |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Materials science
Annealing (metallurgy) Multiferroics Analytical chemistry 02 engineering and technology Combustion 01 natural sciences Heat capacity chemistry.chemical_compound Nitrate Manganites Metastability Magnetic properties 0103 physical sciences Materials Chemistry 010306 general physics Process Chemistry and Technology Chemical preparation 021001 nanoscience & nanotechnology Surfaces Coatings and Films Electronic Optical and Magnetic Materials Amorphous solid Crystallography chemistry Ceramics and Composites Orthorhombic crystal system 0210 nano-technology |
| Zdroj: | Ceramics International |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2012.10.002 |
| Popis: | A new synthesis route for obtaining a single-phase hexagonal YMnO3 was developed, based on the annealing of the amorphous precursor powder obtained by the glycine-nitrate combustion method. The process was monitored by XRD as well as by magnetic and heat capacity measurements. The analysis of these data shows that precursor powder undergoes a gradual phase transformation that depends on the annealing temperature. The metastable orthorhombic YMnO3 phase is the first to appear at temperatures below 700 degrees C, while a mixture of ortho- and hexa-phases was found to exist within the 700-900 degrees C range. An almost complete conversion to hexaphase occurs at 900-1000 degrees C, but to obtain the pure, well crystallized h-YMnO3 phase an annealing temperature of 1300 degrees C was necessary. The synthesis method applied in this work has been proved to be more convenient for obtaining single-phase h-YMnO3 than by a solid state reaction. In addition, it is capable of producing sample free of parasitic phases that are often present in specimens obtained by other synthesis methods. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved. |
| Databáze: | OpenAIRE |
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