Suppression of ferroelectric phase-transition in niobates via solid solution formation
| Autor: | Fabiano R. Praxedes, Flávio F. Ivashita, Andrea Paesano, Silvania Lanfredi, Marcos Augusto Lima Nobre |
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| Přispěvatelé: | Universidade Estadual Paulista (Unesp), Universidade Estadual de Maringá (UEM) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Permittivity
Dielectric spectroscopy Phase transition Materials science Analytical chemistry Niobium chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Tetragonal crystal system Phase-transition suppression Niobate General Materials Science Ceramic Mössbauer spectroscopy Mechanical Engineering 021001 nanoscience & nanotechnology Condensed Matter Physics Ferroelectricity 0104 chemical sciences chemistry Mechanics of Materials visual_art visual_art.visual_art_medium 0210 nano-technology Solid solution |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Made available in DSpace on 2019-10-06T16:39:18Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-11-01 Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Suppression of the phase-transition type ferro-paraelectric from doping of KSr2Nb5O15 host-structure was investigated by set of techniques X-ray diffraction, Mössbauer spectroscopy and Dielectric spectroscopy at high temperature. High crystalline and single phase iron-doped niobate ceramic with Tetragonal Tungsten Bronze TTB-type structure, stoichiometry KSr2(FeNb4)O15-δ, was prepared by conventional technique using high energy milling. Both techniques Rietveld Method and Mössbauer spectroscopy showed that Fe3+ cations occupy two different octahedral sites in the TTB structure on the niobium octahedral sites, termed as Nb(1) and Nb(2). At room temperature, the dielectric permittivity value of the KSr2(FeNb4)O15-δ is two times higher than the permittivity values of the KSr2Nb5O15. The suppression with extinction of ferro-para phase-transition occurs as function of break-down of polar characteristic. New non-polar space group development stemming from solid solution formation is discussed. Department of Chemistry and Biochemistry São Paulo State University (Unesp) School of Technology and Sciences, R. Roberto Simonsen – 305, CEP: 19060-900 Department of Physics São Paulo State University (Unesp) School of Technology and Sciences, R. Roberto Simonsen – 305, CEP: 19060-900 Department of Physics Universidade Estadual de Maringá, Av. Colombo, 5790 Zona 7, CEP: 87020-900 Department of Chemistry and Biochemistry São Paulo State University (Unesp) School of Technology and Sciences, R. Roberto Simonsen – 305, CEP: 19060-900 Department of Physics São Paulo State University (Unesp) School of Technology and Sciences, R. Roberto Simonsen – 305, CEP: 19060-900 FAPESP: 2007/03510-9 FAPESP: 2014/11189-0 FAPESP: 2019/06623-6 |
| Databáze: | OpenAIRE |
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