Preparation and fluorescence spectroscopy of bulk monoclinic Eu3+:Y2O3 and comparison to Eu3+:Y2O3 nanocrystals

Article Abstract:

The bulk monoclinic Eu3+:Y2O3 was prepared by high-temperature, high-pressure synthesis and characterized by laser spectroscopy. The results showed that the bulk monoclinic phase has sharp spectral lines and lacks the line broadening and "secondary" phase of Eu3+:Y2O3 nanocrystals. These optical properties were attributed to the intrinsic features of the monoclinic phase of Eu3+:Y2O3 and not as a result of surface effects in the nanocrystals. In addition, the 5Do fluorescen lifetimes were found to be longer in the nanocrystals than in the bulk monoclinic.

Crystals, Spectra

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Fundamental global model for the structures and energetics of nanocrystalline ionic solids

Article Abstract:

A general analytical theory for the structures and energetics of nanocrystalline ionic solids is presented and the aim is not only to present a comprehensive mathematical formulation but also to provide physical insights into the resulting predictions. It introduces the electrostatic interactions between the ions treated as point charges and the short-range repulsions between the closest ion neighbors with the latter terms written in the Born form Ar(super -n).

Industrial Gas Manufacturing, Industrial gases, Argon, Electric properties, Alkali metals, Electrostatic apparatus and appliances, Electrostatic devices

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Predicting the energetics, phase stability, and morphology evolution of faceted and spherical anatase nanocrystals

Article Abstract:

Predictions of the transition enthalpy of nanocrystalline and rutile is presented using a thermodynamic model as a function of shape, size, and degree of surface pasivation. This showed that thermochemical results can differ for various faceted or spherical nanoparticles.

Usage, Titanium dioxide, Thermal properties, Rutile, Enthalpy

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