Low-temperature synthesis, luminescence and phonon properties of Er and/or Dy doped LaAlO{sub 3} nanopowders
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 WrocLaw 2 (Poland)
- Cinvestav Unidad Saltillo, Apartado Postal 663, Saltillo, 25000 Coahuila (Mexico)
LaAlO{sub 3}, La{sub 0.9}Dy{sub 0.1}AlO{sub 3}, La{sub 0.9}Er{sub 0.1}AlO{sub 3} and La{sub 0.8}Dy{sub 0.1}Er{sub 0.1}AlO{sub 3} nanocrystalline powders were synthesized in a two-step process by combining a mechanically induced metathesis reaction and molten salt synthesis. The proposed two-step methodology easily allows obtaining pure and/or doped perovskite-type LaAlO{sub 3} nanopowders at remarkably low temperatures, i.e., already at 350 Degree-Sign C although firing at 500 Degree-Sign C is needed in order to get pure phases. The obtained samples were characterized by XRD, TEM, Raman, IR and luminescence methods. These methods showed that the mean crystallite size is near 50-60 nm and the LaAlO{sub 3} nanocrystallites have R3{sup Macron }c structure, the same as bulk LaAlO{sub 3}. Raman spectrum of nanocrystalline LaAlO{sub 3} is very similar to that of bulk. In contrast to this behavior, IR spectra of the synthesized compounds are significantly different from the IR spectrum of bulk LaAlO{sub 3}. Origin of this behavior is discussed. Luminescence study showed that the cross-relaxation processes quench emission intensity of the samples doped with Dy{sup 3+} and Er{sup 3+}. - Graphical abstract: TEM image of La{sub 0.9}Er{sub 0.1}AlO{sub 3} (left panel) and histogram showing the particle size distribution (right panel). Highlights: Black-Right-Pointing-Pointer Pure and Er or Dy doped LaAlO3 samples were synthesized at remarkably low temperatures. Black-Right-Pointing-Pointer The mean crystallite size of the obtained samples is 40-60 nm. Black-Right-Pointing-Pointer Nanocrystallites have R3{sup Macron }c structure, the same as bulk LaAlO3. Black-Right-Pointing-Pointer IR spectra are significantly different from the IR spectrum of bulk. Black-Right-Pointing-Pointer We discuss origin of this behavior.
- OSTI ID:
- 22012068
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Vol. . 187; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINATES
CRYSTALS
DOPED MATERIALS
DYSPROSIUM IONS
ERBIUM IONS
INFRARED SPECTRA
LANTHANUM COMPOUNDS
LUMINESCENCE
MOLTEN SALTS
NANOSTRUCTURES
PARTICLE SIZE
PEROVSKITE
POWDERS
RAMAN SPECTRA
SYNTHESIS
TEMPERATURE RANGE 0065-0273 K
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION