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Doctoral Thesis
DOI
https://doi.org/10.11606/T.85.2018.tde-15062018-083316
Document
Author
Full name
Rodrigo Uchida Ichikawa
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2018
Supervisor
Committee
Martinez, Luis Gallego (President)
Craievich, Aldo Felix
Fantini, Marcia Carvalho de Abreu
Ferreira, Fabio Furlan
Suzuki, Paulo Atsushi
Title in Portuguese
Investigação da estrutura local e média de nanopartículas por técnicas de espalhamento e difração de raios X
Keywords in Portuguese
difração de raios X
espalhamento de raios X
estrutura local
ferritas de Mn-Zn
função distribuição de pares atômicos
KY3F10
método de Rietveld
modelamento total do padrão de difração de pó
nanocubos núcleo-camada de FeO-Fe3O4
nanopartículas
Abstract in Portuguese
Neste trabalho, a estrutura local e média de nanopartículas foi estudada utilizando-se métodos de espalhamento e difração de raios X. Os métodos utilizados foram: Análise da Função de Distribuição de Pares Atômicos (Atomic Pair Distribution Function Analysis, em inglês) para o estudo do ordenamento estrutural de curto alcance, Refinamento de Rietveld e Modelamento Total do Perfil de Difração de Pó para o estudo do ordenamento médio. Os materiais estudados foram: nanopartículas de KY3F10 dopadas com Tb, nanocubos núcleo-camada (core-shell, em inglês) de FeO-Fe3O4 e nanopartículas de ferritas de Mn-Zn. O trabalho teve como objetivo demonstrar como os métodos mencionados podem ser utilizados de forma complementar para fornecer informações de curto, médio e longo alcance usando-se dados de espalhamento e difração de raios X. Neste trabalho, ressalta-se a importância de cada método no estudo da estrutura cristalina e demonstra avanço e desenvolvimento de metodologias para a sua aplicação.
Title in English
Local and average structure investigation of nanoparticles using X-ray scattering and diffraction methods
Keywords in English
atomic pair distribution function
core-shell FeO-Fe3O4 nanocubes
diffraction
KY3F10
local structure
Mn-Zn ferrite
nanoparticles
Rietveld analysis
whole powder pattern modelling
X-ray scattering
Abstract in English
In this work, local and average structure of nanoparticles were studied using X-ray scattering and diffraction methods. The methods used were: Atomic Pair Distribution Function Analysis to study the short-range ordering, Rietveld refinement and Whole Powder Pattern Modelling to study the long-range ordering. The studied materials were: Tb-doped KY3F10 nanoparticles, core-shell FeO-Fe3O4 nanocubes and Mn-Zn ferrite nanoparticles. The objective of this work was to demonstrate how the methods mentioned can be used in a complementary way to provide short, average and long range information about the structure using X-ray scattering and diffraction data. The importance of each method to study the crystalline structure is highlighted demonstrating progress and development of methodologies for its application.
 
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Publishing Date
2018-07-12
 
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