| Texto completo | |
| Autor(es): |
Franco, Douglas F.
;
Manzani, Danilo
;
Barud, Hernane S.
;
Antonio, Selma G.
;
de Oliveira, Luiz F. C.
;
Silva, Mauricio A. P.
;
Ribeiro, Sidney J. L.
;
Nalin, Marcelo
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | RSC ADVANCES; v. 6, n. 94, p. 91150-91156, 2016. |
| Citações Web of Science: | 2 |
| Resumo | |
Nickel polyphosphate coacervates have been prepared through the coacervation process of sodium polyphosphate and Ni2+ chloride solutions by the addition of different solvents with low molecular weight. The great potential of nickel polyphosphate coacervates as a material precursor was demonstrated by preparation of nickel polyphosphate glass-ceramics. Structural and spectroscopic properties were analyzed by thermal analysis, X-ray powder diffraction, Raman spectroscopic and UV-VIS techniques. Raman spectra for the nickel polyphosphate coacervates and nickel polyphosphate coacervates glass-ceramics samples shows that the addition of solvents leads to a depolymerization of the polyphosphate chains, resulting in an increase of shorter chains species based on pyrophosphates. The identification and quantification of Ni2P4O12, beta-Ni2P2O7 and delta-Ni2P2O7 crystalline phases present in the nickel polyphosphate glass-ceramics were carried out by X-ray powder diffraction using the Rietveld method. Quantitative phase analyses of the three polymorph forms were also evaluated. Based on interpretation of reflectance spectroscopy and Rietveld refinement, Ni2+ ions may occupy distorted octahedral and tetrahedral sites. (AU) | |
| Processo FAPESP: | 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros |
| Beneficiário: | Edgar Dutra Zanotto |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |