Very Intense Distinct Blue and Red Photoluminescence Emission in MgTiO3 Thin Films Prepared by the Polymeric Precursor Method: An Experimental and Theoretical Approach

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Structural study of thin films prepared from tungstate glass matrix by Raman and X-ray absorption spectroscopy

Thin films were prepared using glass precursors obtained in the ternary system NaPO(3)-BaF(2)-WO(3) and the binary system NaPO(3)-WO(3) with high concentrations of WO(3) (above 40% molar). Vitreous samples have been used as a target to prepare thin films. Such films were deposited using the electron beam evaporation method onto soda-lime glass substrates. Several structural characterizations were performed by Raman spectroscopy and X-ray Absorption Near Edge Spectroscopy (XANES) at the tungsten L(I) and L(III) absorption edges. XANES investigations showed that tungsten atoms are only sixfold coordinated (octahedral WO(6)) and that these films are free of tungstate tetrahedral units (WO(4)). In addition, Raman spectroscopy allowed identifying a break in the linear phosphate chains as the amount of WO(3) increases and the formation of P-O-W bonds in the films network indicating the intermediary behavior of WO(6) octahedra in the film network. Based on XANES data, we suggested a new attribution of several Raman absorption bands which allowed identifying the presence of W-O and W=O terminal bonds and a progressive apparition of W-O-W bridging bonds for the most WO(3) concentrated samples (above 40% molar) attributed to the formation of WO(6) clusters. (C) 2008 Elsevier B.V. All rights reserved.

Structural study of tungstate fluorophosphate glasses by Raman and X-ray absorption spectroscopy

Transparent glasses were synthesized in the NaPO3-BaF2 WO3 tertiary system and several structural characterizations were performed by X-ray absorption spectroscopy (XANES) at the tungsten L-I and L-III absorption edges and by Raman spectroscopy. Special attention was paid to the coordination state of tungsten atoms in the vitreous network.XANES investigations showed that tungsten atoms are only six-fold coordinated (octahedra WO6) and that these glasses are free of tungstate tetrahedra (WO4).In addition, Raman spectroscopy allowed to identify a break in the linear phosphate chains as the amount of WO3 increases and the formation of P-O-W bonds in the vitreous network indicating the modifier behavior of WO6 octahedra in the glass network. Based on XANES data, we suggested a new attribution of several Raman absorption bands which allowed to identify the presence of W-O- and W=O terminal bonds and a progressive apparition of W-O-W bridging bonds for the most WO3 concentrated samples (≥ 30% molar) due to the formation of WO6 clusters. © 2004 Elsevier B.V. All rights reserved.

Economic Survey of Latin America and the Caribbean 2010-2011: Internacional integration and macroeconomic policy challenges amid global economic turmoil

Includes bibliography

Regulation, worker protection and active labour-market policies in Latin America

Includes bibliography

Structural change and productivity growth, 20 years later: old problems, new opportunities

Includes bibliography

A preliminary assessment of the policies implemented by the governments of Latin America and the Caribbean in response to the crisis - May 2010 Meeting

Includes bibliography

Foreign investment in Mexico after economic reform

Includes bibliography

Institutional and policy convergence with growth divergence in Latin America

Includes Bibliography

Long run economic development in Latin America in a comparative perspective: proximate and ultimate causes

Includes bibliography

Growth, distributive justice and social policy

Includes bibliography

Structural change and productivity growth 20 years later: old problems, new opportunities. Summary

Includes bibliography

Preliminary Overview of the Economies of Latin America and the Caribbean 1998

Includes bibliography.

为平等的结构改变 综合发展

In today's complex and changing global context, the Latin American and Caribbean region must persevere, more than ever, in three directions: structural change to underpin progress towards more knowledge-intensive sectors, convergence to reduce internal and external gaps in income and productivity, and equality of rights. This is the integrated approach proposed by ECLAC as a route towards the development the region needs. This implies tackling three major challenges: to achieve high and sustained rates of growth so as to close structural gaps and generate quality jobs; to change consumption and production patterns in the context of a genuine technological revolution with environmental sustainability; and to guarantee equality on the basis of greater convergence in the production structure, with universal social protection and capacity-building. Such an endeavour requires the return of politics and of the State's role in promoting investment and growth, redistribution and regulation with a view to structural change for equality, through industrial, macroeconomic, social and labour policies. These are some of the key proposals of Structural Change for Equality: An Integrated Approach to Development, which ECLAC will present to its member States at the thirty-fourth session of the Commission (San Salvador, August 2012). The proposals in that document, which is summarized here, deepen and broaden the ideas set forth in Time for equality: closing gaps, opening trails, aiming towards sustainable development with equality and taking into account the diverse national conditions across the region.