Dielectric Behavior of alpha-Ag2WO4 and its Huge Dielectric Loss Tangent
| Autor: | Maria Aparecida Zaghete, Natalia Jacomaci, Fernando Modesto Borges de Oliveira, Euripedes Silva Junior, Elson Longo |
|---|---|
| Přispěvatelé: | Universidade Estadual Paulista (Unesp), Universidade Federal de São Carlos (UFSCar) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Scanning electron microscope Rietveld refinement Mechanical Engineering Analytical chemistry Dielectric Condensed Matter Physics X-ray photoelectron spectroscopy Mechanics of Materials dielectric behavior Phase (matter) Silver tungstate nanorods TA401-492 Dissipation factor General Materials Science Dielectric loss Orthorhombic crystal system ionic and electronic polarization silver tungstate nanorods Materials of engineering and construction. Mechanics of materials |
| Zdroj: | Web of Science Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP Materials Research v.22 n.4 2019 Materials research (São Carlos. Online) Universidade Federal de São Carlos (UFSCAR) instacron:ABM ABC ABPOL Materials Research, Volume: 22, Issue: 4, Article number: e20190058, Published: 02 SEP 2019 Materials Research, Vol 22, Iss 4 (2019) |
| ISSN: | 1516-1439 |
| Popis: | Made available in DSpace on 2019-10-04T12:15:58Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-01-01. Added 1 bitstream(s) on 2019-10-09T18:33:32Z : No. of bitstreams: 1 S1516-14392019000400227.pdf: 889130 bytes, checksum: 00bc506324f9f2c41c449c5582db6822 (MD5) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) The microwave-assisted hydrothermal method was used to obtain alpha-Ag2WO4. Rietveld refinement confirmed that alpha-Ag2WO4 is stable in the orthorhombic phase, without secondary phase. However, field-effect scanning electron microscope analysis showed that alpha-Ag2WO4 nanorods surfaces contain silver nanoparticles, confirmed by the X-ray photoelectron spectroscopy by the peak observed at 374.39 eV In addition to metallic Ag, other Ag oxidation states were also observed on the surface. Hence, Ag (I) as Ag2O and Ag (I) as Ag(2)WO(4 )also were identified. DC measurements exhibited a high capacity of charge storage, nevertheless, with a large loss tangent (0.12 mu C.cm(-2).V-1) and no residual polarization for the voltage range between -100 V and +100 V. AC measurements at frequencies less than 275 Hz, revealed that ionic polarization is dominant, whereas at frequencies higher than 275 Hz, the electronic behavior predominates. The potential of electromagnetic energy conversion in thermal was observed from loss tangent analysis. Univ Estadual Paulista, UNESP, Inst Quim, BR-14800060 Araraquara, SP, Brazil Univ Fed Sao Carlos UFSCar, Dept Quim, BR-13565905 Sao Carlos, SP, Brazil Univ Estadual Paulista, UNESP, Inst Quim, BR-14800060 Araraquara, SP, Brazil FAPESP: 2013/07296-2 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|