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.)

Optical and EPR studies of zinc phosphate glasses containing Mn2+ ions

Full text
Author(s):
Franco, Douglas F. [1] ; Manzani, Danilo [2] ; Carvajal, Eduar E. [3] ; Prando, Gabriela Augusta [3] ; Donoso, Jose Pedro [4] ; Magon, Claudio J. [4] ; Antonio, Selma G. [1] ; Gobato, Yara Galvao [3] ; Nalin, Marcelo [1]
Total Authors: 9
Affiliation:
[1] Univ Estadual Paulista, UNESP, Inst Quim Araraquara, POB 355, BR-14801970 Araraquara, SP - Brazil
[2] Univ Sao Paulo, IQSC, POB 780, Sao Carlos, SP - Brazil
[3] Univ Fed Sao Carlos, Dept Fis, Rod Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil
[4] Univ Sao Paulo, IFSC, POB 369, Sao Carlos, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Journal of Materials Science; v. 55, n. 23, SI MAY 2020.
Web of Science Citations: 1
Abstract

A set of glass samples with composition based on ternary 50P(2)O(5)-30Na(2)O-20ZnO (PNZ) matrix doped with different MnO contents was prepared via melt-quenching technique. Thermal, structural and spectroscopic properties were investigated by differential scanning calorimetry (DSC), X-ray powder diffraction (XRD), Raman spectroscopy, UV-visible absorption, photoluminescence (PL) and by electron paramagnetic resonance (EPR) using Mn2+ as probe. Glass compositions (100-x)PNZ:xMn (0.01 <= x <= 1.0 in mol% of MnO) were characterized as glasses after careful analysis of the thermal and structural data. While DSC curves show the presence of the glass transition phenomenon (T-g), XRD analysis identified the non-crystalline arrangement, compatible with glass structure. Raman spectra of PNZ:xMn samples showed that the successive increase in Mn2+ content leads to rise of vibrational modes assigned to phosphate Q(1) units, suggesting the breakdown of phosphate glass network chains. UV-Vis absorption spectra of glasses presented absorption bands centered at 250, 318, 341, 358 and 408 nm attributed to the Mn2+ electronic transitions. Glass samples containing above 0.06 mol% of MnO presented a broadband absorption centered at 511 nm assigned to the presence of traces of Mn3+. Additionally, UV-Vis, PL and EPR data showed that Mn2+ ions are occupying octahedral arrangements. Besides, EPR results suggest that the increase in MnO concentration influences on the EPR signal and hyperfine splitting constant suggests the presence of a moderately ionic bond between Mn2+ and PNZ glass network. (AU)

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
FAPESP's process: 18/16126-7 - Optically active glasses for photonic applications: synthesis, characterization and applications of quantum dots embedded in oxide glasses.
Grantee:Danilo Manzani
Support type: Regular Research Grants
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: 16/10668-7 - Optical and Transport Properties of two-dimensional semicondutors based on transition metal dichalcogenides
Grantee:Yara Galvão Gobato
Support type: Regular Research Grants