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Growth and characterization of Nd, Yb – yttrium oxide nanopowders obtained by sol-gel method

✍ Scribed by A. Rzepka; W. Ryba-Romanowski; R. Diduszko; L. Lipińska; A. Pajączkowska

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
491 KB
Volume
42
Category
Article
ISSN
0232-1300

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✦ Synopsis

Nanopowders of Y 2 O 3 pure, doped and codoped by Nd 3+ , Yb 3+ were obtained by sol-gel method. Solution with ethylene glycol was choosed as the proper solution where crystallites of powder with Nd and Yb dopants had the same size. Finally the one-phased compounds of Y 2 O 3 doped 0.5 at% Nd and 1, 2 or 4 at% Yb were obtained. Grain growth and their morphology were investigated in various temperature and time of heating. The changes of crystallite sizes and lattice constants in relation to the heating time and temperature for the composition Y 2 O 3 doped 0.5 at% Nd and 2 at% Yb are presented. Y 2 O 3 containing 0,5 at% of Nd exhibits intense luminescence bands centered at 920 nm, 1100 nm and 1360 nm whereas a single band at about 1020 nm appears in samples co-doped with neodymium and ytterbium. Luminescence spectra recorded did not depend on the sample preparation procedure and size of grains. OH impurity affects critically the relaxation dynamics of luminescent ion in nanopowders.

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✍ L. Lipińska; A. Rzepka; R. Ryba-Romanowski; D. Klimm; S. Ganschow; R. Diduszko 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 247 KB

## Abstract The nanocrystalline powders of Y~4~Al~2~O~9~ (YAM) pure and doped by Nd, Yb and codoped by Nd and Yb were obtained via modified sol‐gel method. These powders were characterized by X‐ray diffraction method, scanning electron microscopy and high resolution scanning electron microscopy, lu