Síntese e caracterização estrutural do composto AMn2O4 (A = Ni, Co e Zn)
Oxide comp ounds with a spinel-typ e structure show a range of physical prop erties and have many practical applications. In these oxides, ions of different oxidation states o ccupy b oth tetrahedral and o ctahedral sites. Their physical prop erties dep end on the nature of ions as well as the dis...
| Autor principal: | AZEVEDO, Allan Silva |
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| Grau: | TCC |
| Idioma: | pt_BR |
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Universidade Federal do Oeste do Pará
2024
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| Acesso em linha: |
https://repositorio.ufopa.edu.br/jspui/handle/123456789/1416 |
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ir-123456789-1416 |
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ir-123456789-14162024-02-29T21:32:06Z Síntese e caracterização estrutural do composto AMn2O4 (A = Ni, Co e Zn) AZEVEDO, Allan Silva CABRAL, Alex Junior de Freitas http://lattes.cnpq.br/9461734167915661 Oxidos Espin´elios Sol-Gel Manitol Difra¸c˜ao de Raios X CNPQ::CIÊNCIAS EXATAS E DA TERRA Oxide comp ounds with a spinel-typ e structure show a range of physical prop erties and have many practical applications. In these oxides, ions of different oxidation states o ccupy b oth tetrahedral and o ctahedral sites. Their physical prop erties dep end on the nature of ions as well as the distribuition of these ions in the crystallographic sites. Among these materials, spinel oxides A Mn2O4 (A = Ni, Zn, and Co) have attracted very attention due to Mn ions present different valence states in the structure of oxides. Mn cations influence strongly on the physical properties of these oxide materials. In this work, oxide compounds AMn2O4 (A = Ni, Zn, and Co) were produced by an aqueous sol-gel method using manitol as a gelling agent. X-ray diffraction (XRD) was used to monitor the formation of compounds and identify crystalline structures of the produced materials. The experimentnal XRD patterns were treated by X’Pert High Score Plus r software. Results showed that the NiMn2O4 compound was obtained at 900 ◦C. After this temperature was observed the decomposition of material, where Mn undergoes a segregation, taking the formation of the Mn3O4 phase at 950 ◦C. The CoMn2O4 was formed in the temperature range 850 - 950 ◦C without secondary phases. It was not possible to obtain single-phase ZnMn2O4 compound in the range of calcination temperatures used. Comp ostos ´oxidos com a estrutura do tip o espin´elio apresentam uma gama de propriedades f´ısicas e, consequentemente, as mais diversas aplica¸c˜oes pr´aticas. Nesses ´oxidos, ´ıons de diferentes estados de oxida¸c˜ao est˜ao presentes tanto em s´ıtios tetra´edricos quanto em s´ıtios o cta´edricos. Suas propriedades f´ısicas dep endem da natureza dos ´ıons met´alicos e tamb´em da distribui¸c˜ao desses ´ıons nos s´ıtios cristalogr´aficos. Dentre esses materiais, os ´oxidos espin´elios AMn2O4 (A = Ni, Zn e Co) tˆem evocado grande interesse por apresentarem na sua estrutura ´ıons Mn em diferentes estados de valˆencia, os quais exercem um efeito substancial nas propriedades f´ısicas desses materiais. Neste trabalho, compostos ´oxidos AMn2O4 (A = Ni, Zn e Co) foram produzidos atrav´es de um m´etodo sol-gel aquoso, utilizando o manitol como agente geleificante. A difra¸c˜ao de raios X (DRX) foi utilizada para monitorar a forma¸c˜ao dos compostos e identificar as estruturas cristalogr´aficas dos materiais produzidos. Os padr˜oes de DRX experimentais foram tratados no software X’Pert High Score Plus r. Os resultados mostraram que para a rota de s´ıntese empregada, o composto NiMn2O4 foi obtido na temperatura de 900 ◦C. Ap´os essa temperatura observou-se a decomposi¸c˜ao do material, onde o Mn sofreu uma segrega¸c˜ao, levando `a forma¸c˜ao de Mn3O4, em 950 ◦C. A fase do composto CoMn2O4 foi identificada na faixa de temperatura de 850 a 950 ◦C, sem fases secund´arias. N˜ao foi poss´ıvel obter o composto ZnMn2O4 em fase ´unica, nas temperaturas de calcina¸c˜ao adotadas. 2024-02-28T22:52:15Z 2024-02-28T22:52:15Z 2017 TCC AZEVEDO, Allan Silva. Síntese e caracterização estrutural do composto AMn2O4 (A = Ni, Co e Zn). Orientador: Alex Junior de Freitas Cabral. 2017. 34 p. Trabalho de Conclusão de Curso (Ciência e Tecnologia) - Instituto de Engenharia e Geociências, Universidade Federal do Oeste do Pará, 2017. Disponível em: https: https://repositorio.ufopa.edu.br/jspui/handle/123456789/1416 https://repositorio.ufopa.edu.br/jspui/handle/123456789/1416 pt_BR Acesso Aberto application/pdf Universidade Federal do Oeste do Pará Brasil Not applicable UFOPA Instituto de Engenharia e Geociências |
| institution |
Repositório Institucional - Universidade Federa ldo Oeste do Pará - UFOPA |
| collection |
DSpace |
| language |
pt_BR |
| topic |
Oxidos Espin´elios Sol-Gel Manitol Difra¸c˜ao de Raios X CNPQ::CIÊNCIAS EXATAS E DA TERRA |
| spellingShingle |
Oxidos Espin´elios Sol-Gel Manitol Difra¸c˜ao de Raios X CNPQ::CIÊNCIAS EXATAS E DA TERRA AZEVEDO, Allan Silva Síntese e caracterização estrutural do composto AMn2O4 (A = Ni, Co e Zn) |
| topic_facet |
Oxidos Espin´elios Sol-Gel Manitol Difra¸c˜ao de Raios X CNPQ::CIÊNCIAS EXATAS E DA TERRA |
| description |
Oxide comp ounds with a spinel-typ e structure show a range of physical prop erties
and have many practical applications. In these oxides, ions of different oxidation states o ccupy b oth tetrahedral and o ctahedral sites. Their physical prop erties dep end on
the nature of ions as well as the distribuition of these ions in the crystallographic sites.
Among these materials, spinel oxides A Mn2O4 (A = Ni, Zn, and Co) have attracted very
attention due to Mn ions present different valence states in the structure of oxides. Mn
cations influence strongly on the physical properties of these oxide materials. In this
work, oxide compounds AMn2O4 (A = Ni, Zn, and Co) were produced by an aqueous
sol-gel method using manitol as a gelling agent. X-ray diffraction (XRD) was used to
monitor the formation of compounds and identify crystalline structures of the produced
materials. The experimentnal XRD patterns were treated by X’Pert High Score Plus r
software. Results showed that the NiMn2O4 compound was obtained at 900 ◦C. After
this temperature was observed the decomposition of material, where Mn undergoes a
segregation, taking the formation of the Mn3O4 phase at 950 ◦C. The CoMn2O4 was formed in the temperature range 850 - 950 ◦C without secondary phases. It was not possible
to obtain single-phase ZnMn2O4 compound in the range of calcination temperatures used. |
| author_additional |
CABRAL, Alex Junior de Freitas |
| author_additionalStr |
CABRAL, Alex Junior de Freitas |
| format |
TCC |
| author |
AZEVEDO, Allan Silva |
| title |
Síntese e caracterização estrutural do composto AMn2O4 (A = Ni, Co e Zn) |
| title_short |
Síntese e caracterização estrutural do composto AMn2O4 (A = Ni, Co e Zn) |
| title_full |
Síntese e caracterização estrutural do composto AMn2O4 (A = Ni, Co e Zn) |
| title_fullStr |
Síntese e caracterização estrutural do composto AMn2O4 (A = Ni, Co e Zn) |
| title_full_unstemmed |
Síntese e caracterização estrutural do composto AMn2O4 (A = Ni, Co e Zn) |
| title_sort |
síntese e caracterização estrutural do composto amn2o4 (a = ni, co e zn) |
| publisher |
Universidade Federal do Oeste do Pará |
| publishDate |
2024 |
| url |
https://repositorio.ufopa.edu.br/jspui/handle/123456789/1416 |
| _version_ |
1829179793398038528 |
| score |
11.755432 |