Preparation and surface effect analysis of trivalent europium-doped nanocrystalline La(sub 2)O(sub 2)S

Article Abstract:

Gel thermolysis was used to prepare La(sub 2)O(sub 2)S:Eu(super 3+) nanocrystals (NCs) with a mean size of 18 nm. The results of the laser-selective excitation indicate that the degradation of the site symmetry of Eu(super 3+) seems to be abrupt, which means the as-synthesized La(sub 2)O(sub 2)S:Eu(super 3+) NCs might be of the La(sub 2)O(sub 2)S/La(sub 2)O(sub 2-x)S(sub 1+x) core-shell structure and the shell are not in a disordered sate but rather pure one.

Lanthanum & Compounds, Europium & Compounds, Thermal properties, Surface chemistry, Lanthanum, Structure, Europium

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Effect of OH- on the luminescent efficiency and lifetime of Tb(super 3+)-doped yttrium orthophosphate synthesized by solution precipitation

Article Abstract:

The solution precipitation method is used to synthesize Tb(super 3+)-doped yttrium orthophosphate, which is green-emission luminescent material. The evolution of hydrated yttrium orthophosphate (YPO4.2H2O) to dehydrated yttrium orthosphosphate (YPO4) is observed in the heat-treatment process, simultaneously, accompanying the structural transformation from monoclinic churchite-type to tetragonal xenotime-type structure.

Yttrium & Compounds, Chemical properties, Yttrium compounds, Terbium

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Formation of the C-S-H layer during early hydration of tricalcium silicate grains with different sizes

Article Abstract:

A study is conducted on the effect of particle size on the different process of hydration of tricalcium silicate, the nucleation, the growth and the thickness of the layer limiting the hydration rate. The thickness of the C-S-H layer when the reaction becomes limited by diffusion is estimated.

Industrial Gas Manufacturing, Industrial gases, Hydrogen, Sulfur Compounds, Electric properties, Carbon compounds, Sulphur compounds

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