Properties of the amorphous-nanocrystalline Gd2O3 powder prepared by pulsed electron beam evaporation

Abstract

Abstract-An amorphous-nanocrystalline Gd 2 O 3 powder with a specific surface area of 155 m 2 /g has been prepared using pulsed electron beam evaporation in vacuum. The nanopowder consists of 20 to 500 nm agglomerates formed by crystalline nanoparticles (3-12 nm in diameter) connected by amorphous-nanoc rystalline strands. At room temperature, the Gd 2 O 3 nanopowder exhibits a paramagnetic behavior. The phase transformations occurring in the powder have been investigated using differential scanning calorimetry and thermogravimetry (40-1400°C). The amorphous phase of the nanopowder is thermally stable up to a tem perature of 1080°C. It has been found that the amorphous phase has an inhibitory effect on the temperature of the polymorphic transformation from the cubic phase into the monoclinic phase. It has been revealed that, compared with the microcrystalline powder, the Gd 2 O 3 nanopowder is characterized by a complete quench ing of photoluminescence.

Investigations of anharmonic effects via phonon mode variations in nanocrystalline Dy2O3, Gd2O3 and Y2O3

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Preparation and effect of thermal treatment on Gd2O3:SiO2 nanocomposite

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Gd2O3:SiO2 Nanocomposite: Study on Structural and Optical Behavior

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