Advanced search
Start date
Betweenand
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Structural and EPR studies of Cu(2+)ons in NaPO3 - Sb2O3 - CuO glasses

Full text
Author(s):
Franco, Douglas F. [1] ; Carvajal, Eduar E. [2] ; Donoso, Jose Pedro [3] ; Silva, Mauricio A. P. [4] ; Sant'Ana, Antonio C. [4] ; Fares, Hssen [1] ; Magon, Claudio J. [3] ; Nalin, Marcelo [1]
Total Authors: 8
Affiliation:
[1] Univ Estadual Paulista, UNESP, Inst Quim Araraquara, POB 355, BR-14801970 Araraquara, SP - Brazil
[2] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil
[3] Univ Sao Carlos, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[4] Univ Fed Juiz de Fora, Inst Ciencias Exatas, Dept Quim, BR-36036900 Juiz de Fora, MG - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Journal of Non-Crystalline Solids; v. 503, p. 169-175, JAN 15 2019.
Web of Science Citations: 1
Abstract

In this work, glass compositions in the system NaPO3 - Sb2O3 - CuO (PSbCu) containing different concentrations of CuO and Sb2O3 were prepared through the melt - quenching methodology. Thermal, structural and optical properties of the PSbCu glasses were systematically studied by differential scanning calorimetry (DSC), X-ray powder diffraction (XRD) and Raman, UV-Visible and Photoluminescence (PL) spectroscopies, besides electron paramagnetic resonance (EPR) measurements. The DSC curves for all samples presented the glass transition phenomenon (T-g), while the XRD patterns showed the presence of an amorphous halo, which confirmed the glassy nature of all samples analyzed. UV-Vis spectra of the glasses showed a transparent window from 450 to 800 nm. The EPR signals intensities were investigated as a function of the copper concentration and Sb2O3 content in the (PySb0.5Cu) (20 <= y <= 80) and (PSb80xCu) (0.25 <= x <= 1.25) glasses. The EPR results showed that the increase of Sb2O3 concentration on the PySb0.5Cu glasses decreased the Cu2+ signals, which suggests the Sb3+ oxidizing to Sb5+, also transferring electrons to Cu2+ species to create the EPR a silent Cu+ specie. According to EPR parameters and PL spectra (excited at 380 nm) of PySb0.5Cu glasses, the ions Cu2+ ions were preferentially found in a distorted octahedral geometry, while Cu+ is in a square planar geometry according to the Jahn-Teller effect. (AU)

FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
Grantee:Edgar Dutra Zanotto
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 16/16900-9 - Preparation of heavy metal oxide glasses fibers with optical and magneto-optical properties
Grantee:Douglas Faza Franco
Support type: Scholarships in Brazil - Post-Doctorate