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Effect of Nd3+doping on structure,microstructure,lattice distortion and electronic properties of TiO_2 nanoparticles

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Journal of Rare Earths 2017年第3期35卷 259-270页

作者： Balter Trujillo-Navarrete maría del pilar haro-vázquez Rosa maría Félix-Navarro Francisco Paraguay-delgado Henry Alvarez-Huerta Sergio Pérez-Sicairos Edgar Alonso Reynoso-Soto institute technology of tijuana(itt) blvd.alberto limón padillaP.O.B 1166.Tijuana B.C.Mexico university autonomous of baja california(uabc) roadway university14418P.O.B 22390Tijuana B.C.Mexico investigations center of advanced materials(cimav).miguel de cervantes 120.P.O.B31109ChihuahuaMexico

Doped and undoped TiCh nanoparticles were prepared by Stober method and thermally treated at 600 ℃.The effect of Nd^（3＋） ion on the structure and micro structure of anatase-phase TiCh nanocrystals was studied by Rietveld refinement method using X-ray powder diffraction *** lengths,bond angles,and edges distances were *** phase formation was confirmed by high-resolution transmission electron *** adjustment of Ti-0 bond length induced by the addition of Nd^（3＋） ions,reduced the octahedral distortion and altered the octahedral array in the anatase-phase TiCh *** changes of structure and microstructure were mainly observed for TiCh nanoparticles doped with 0.1 at.%of Nd^（3＋） ions and attributed to the cationic substitution of Ti^（4＋） ions which promoted changes in the density of states and gap band of *** dopant insertion resulted in a better structural stability of the nanocrystals that enhanced their charge transference and photocatalytic efficiency.

关键词： neodymium TiO_2 nanoparticles microstructure lattice distortion photocatalytic activity optical properties Rietveld refinement rare earths

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Nucleation of Fe-Rich Intermetallic Phases on α-Al_(2)O_(3) Oxide Films in Al-Si Alloys

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Journal of Minerals and Materials Characterization and Engineering 2015年第1期3卷 15-25页

作者： pilar Orozco-Gonzalez Manuel Castro-Roman Simitrio Maldonado-Ruiz Sergio haro-Rodriguez Fabian Equihua-Guillen Rodrigo Muniz-valdez Salvador Luna-Alvarez Miguel Montoya-Davila Alejandra Hernandez-Rodriguez Academic Unit of Engineering Autonomous University of ZacatecasZacatecasMexico CINvESTAv Saltillo SaltilloMexico Faculty of Engineering Autonomous University of CoahuilaMexico

Nucleation of Fe-rich intermetallic phases on α-Al2O3 oxide films was analyzed in five experimental Al-Fe-Mn-Si alloys. In an attempt to verify the role of α-Al2O3 films in nucleating Fe-rich intermetallics, experiments have been conducted under conditions where formed in situ oxide films were present. Some Fe-rich intermetallics are observed to be related with the oxide films in the microstructure, the present results are in accordance with some research that suggest that the Fe-rich intermetallic phases nucleate upon the oxide films. The intermetallic phases and α-Al2O3 films were unambiguously identified with the help of complementary techniques such as thermal analysis, SEM/EDS and X-ray diffraction.

关键词： Aluminum Alloys Intermetallics Nucleation Crystal Growth Oxide Films

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