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Microstructure and Surface Morphology of Nanocrystalline Silver Silicates

100%

Duhan S.

Acta Physica Polonica A

2012

vol. 121

issue 3

636-638

Microstructure and surface morphology of AgO nanocrystallites (25 nm) supported on SiO_2 and subjected to heat treatment in air up to 500C have been studied by transmission electron microscopy, scanning electron microscopy, and the Fourier transform infrared spectroscopy measurements. It has been found that heating at 500C resulted in spreading of AgO over silica and formation of quasi two-dimensional amorphous phase (silicate precursor) exhibiting very weak band at 566 cm^{-1} have appeared in the Fourier transform infrared spectroscopy. Nanocrystalline silver silicate of undefined structure formed at 300-500C.

Influence of Temperature and Time on Nd_2O_3-SiO_2 Composite Prepared by the Solgel Process

63%

Duhan S., Aghamkar P.

Acta Physica Polonica A

2008

vol. 113

issue 6

1671-1677

Using solgel method Nd_2O_3-SiO_2 binary oxide systems were prepared. The binary oxide transformed from the amorphous phase to nanocrystalline phase upon heat treatment in air. Characterization of the Nd_2O_3-SiO_2 was carried out by using X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy. The effect of the sintering temperature and time on the evolution of the binary oxide system was discussed. It is found that sintering time plays a pivotal role to obtain Nd_2O_3-SiO_2 nanocomposite. At temperature of 900°C, the sample was sintered for 12 h and monoclinic Nd_2O_3 nanocrystallites, with average crystallite size ≈12 nm, were obtained.

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2 Acta Physica Polonica A

1 2012

1 2008

2 Duhan S.

1 Aghamkar P.

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Microstructure and Surface Morphology of Nanocrystalline Silver Silicates

Influence of Temperature and Time on Nd_2O_3-SiO_2 Composite Prepared by the Solgel Process