Propriedades microestruturais, estruturais e ópticas de

Propriedades microestruturais, estruturais e ópticas de

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(Propriedades microestruturais, estruturais e ópticas de nanopartículas de
pigmentos de PbO-CrO3 sintetizadas por rota soft)
V. D. Araújo1*, M. R. B. Andreeta2, L. J. Q. Maia3, R. M. Nascimento4, F. V. Motta4,
M. R. D. Bomio4, C. A. Paskocimas4, M. I. B. Bernardi5
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Abstract
PbCrO4 and Pb2CrO5 particles were synthesized by the polymeric precursor method. Structural and microstructural properties of the
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WHFKQLTXHV7KHGLIIXVHUHÁHFWDQFHWHFKQLTXHZDVHPSOR\HGWRVWXG\WKHRSWLFDOSURSHUWLHVLQWKHQPUDQJH7KHRSWLFDO
bandgap of the samples was obtained indirectly. Colorimetric coordinates L*, a*, b* were calculated for the pigment powders
DV D IXQFWLRQ RI WKH KHDW WUHDWPHQW o& 7KH SRZGHUV GLVSOD\HG FRORUV UDQJLQJ IURP JUHHQ WR UHG ;UD\ GLIIUDFWLRQ
patterns showed the presence of monoclinic PbCrO4 phase in green samples, while red powders had a monoclinic Pb2CrO5 phase
VWUXFWXUH7KH5DPDQVSHFWUDRIWKH3E&U24 and Pb2CrO5 powders were in good agreement with those reported in the literature. The
synthesized compounds can be used as green and red pigments with high thermal stability.
Keywords: nanoparticles, PbCrO4, structural properties, microstructural properties, optical properties.
Resumo
Partículas de PbCrO4 and Pb2CrO5 foram sintetizadas pelo método do precursor polimérico. Propriedades estruturais e
microestruturais das partículas forma caracterizadas por técnicas de microscopia eletrônica de varredura, difração de raios
;HHVSHFWURVFRSLD5DPDQ$WpFQLFDGHUHÁHWkQFLDGLIXVDIRLHPSUHJDGDSDUDRHVWXGRGDVSURSULHGDGHVySWLFDVQDIDL[D
QP2EDQGJDSySWLFRIRLREWLGRLQGLUHWDPHQWH$VFRRUGHQDGDVFRORULPpWULFDV/DEIRUDPFDOFXODGDVSDUDRVSyVGH
SLJPHQWRHPIXQomRGRWUDWDPHQWRWpUPLFRo&2VSyVDSUHVHQWDUDPFRUHVGRYHUGHDRYHUPHOKR2VGLIUDWRJUDPDVGH
raios X mostraram a presença da fase PbCrO4PRQRFOtQLFDQDVDPRVWUDVYHUGHVHQTXDQWRRVSyVYHUPHOKRVDSUHVHQWDUDPDIDVH
Pb2CrO5PRQRFOtQLFD2VHVSHFWURV5DPDQGRVSyVGH3E&U24 e Pb2CrO5HVWmRHPFRQFRUGkQFLDFRPRVUHSRUWDGRV2VFRPSRVWRV
VLQWHWL]DGRVSRGHPVHUXVDGRVFRPRSLJPHQWRVYHUGHVHYHUPHOKRVFRPDOWDHVWDELOLGDGHWpUPLFD
Palavras-chave: nanopartículas, PbCrO4SURSULHGDGHVHVWUXWXUDLVSURSULHGDGHVPLFURHVWUXWXUDLVSURSULHGDGHVySWLFDV
INTRODUCTION
In recent years, much attention has focused on
nanostructured systems applied in electronic devices or to
improve mechanical, chemical, structural, optical, electrical
and magnetic properties of materials [1, 2]. Manipulation
of the thermodynamic and kinetic control processes plays a
NH\UROHLQFU\VWDOJURZWKZKLFKGHWHUPLQHVWKHÀQDOFU\VWDO
habit, phase, shape, and structures [3, 4]. The added value
of a compound depends on its structural, morphological and
optical properties. These properties depend directly on the
crystal structure of the material. Thus, studies relating to
the material’s structure, physical properties, and method of
synthesis are essential.