| Full text | |
| Author(s): |
Franco, Douglas F.
;
Manzani, Danilo
;
Carvajal, Eduar E.
;
Prando, Gabriela Augusta
;
Donoso, Jose Pedro
;
Magon, Claudio J.
;
Antonio, Selma G.
;
Gobato, Yara Galvao
;
Nalin, Marcelo
Total Authors: 9
|
| Document type: | Journal article |
| Source: | Journal of Materials Science; v. 55, n. 23, p. 14-pg., 2020-05-05. |
| 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 Opportunities: | Scholarships in Brazil - Post-Doctoral |
| 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 Opportunities: | Regular Research Grants |
| FAPESP's process: | 13/07793-6 - CeRTEV - Center for Research, Technology and Education in Vitreous Materials |
| Grantee: | Edgar Dutra Zanotto |
| Support Opportunities: | 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 Opportunities: | Regular Research Grants |