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Synthesis and Structural Characterization of Monocrystalline α-V₂O₅ Nanowires

Materials Sciences and Applications 2016年第9期7卷 484-495页

作者： María Luisa Tafoya Ronquillo Patricia Santiago Jacinto Pilar Ovalle Luis Rendón Vázquez elizabeth chavira martínez Ernesto Marinero Vicente Garibay Instituto de Física UNAM Circuito de la Investigación s/n Ciudad Universitaria México D.F. México Instituto de Investigaciones en Materiales UNAM Circuito de la Investigación s/n Ciudad Universitaria México D.F. México Purdue University Purdue Mall West Lafayette IN USA Instituto Mexicano del Petróleo IMP México D.F. México

A stable one-dimensional system in an orthorhombic α-V2O5 nanowires monocrystalline structure was obtained by a solvothermal method from a polymorphic V2O5 structure. The starting material was firstly submitted to acid hydrolysis in H2O2 followed by a solvothermal treatment. The outcome of this procedure, a metastable phase of the one-dimensional system V10O24·12H2O/V3O7·H2O, was subsequently reoxidized by controlled heating in an open air system. The final product was an orange crystalline solid mainly formed by monocrystalline nanowires of α-V2O5 having lengths of tens of micrometers and widths of about 75 nm with a preferential [200] growth direction. It was found that the pH value of the initial solution plays an important role in the formation of the crystalline phase in the final products. Characterization was performed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). This study offers an alternate route for the synthesis of vanadium oxides and related compounds.

关键词： Nanostructures Oxides Crystal Growth X-Ray Diffraction Crystal Structure

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Study of the (Ca1–xSrx) RuO3System with Nano-Crystals Prepared by the Solid-State Reaction Method

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Materials Sciences and Applications 2015年第1期6卷 16-22页

作者： Adolfo Quiroz elizabeth chavira José Eduardo Espinosa Rodolfo Palomino-Merino Ernesto Esteban Marinero Masaya Nishioka Valentín García-Vázquez Facultad de Ciencias Fí sico-Matemá ticas Postgrado en F&iacute sica Aplicada Benem&eacute rita Universidad Autónoma Puebla Ciudad Universitaria Puebla M&eacute xico Instituto de Investigaciones en Materiales Universidad Nacional Autónoma de M&eacute xico M&eacute xico D.F. M&eacute xico Purdue University West Lafayette IN USA Hitachi San José Research Center San Jos&eacute California USA Instituto de Fí sica LRT Benem&eacute rita Universidad Autónoma de Puebla Puebla M&eacute xico

We present a study of their structure, morphology, electrical and magnetic properties on the (Ca1–xSrx) RuO3 system for x = 0.0, 0.07, 0.10, 0.15 and 1.0. The samples were prepared by the solidstate reaction method in air at ambient pressure and heat in the 700℃ - 800℃ range for 48 h. By X-ray powder diffraction (XRD), we determine a solid solution until x = 0.15. Scanning electron microscopy (SEM) indicates that the particle size is 77 - 266 nm. The resistance measurements, as a function of temperature measurements from 7 to 300 K the (Ca1–xSrx) RuO3 system for x = 0.0, 0.07, 0.10, 0.15 and 1.0 show a metallic behaviour. We can even observe that the resistance of the samples is due to the partial substitution of Sr2+ ions and Ru ion valence. Finally, the sample x = 0.07 has a magnetization applied high field to 10 K, whereas that to 300 K does not have a magnetization.

关键词： Solid-State Reaction XRD SEM Electric Resistivity Magnetic Properties

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Study and Characterization of （KxSr1-x）CrOz, x = 0.10-0.50System

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材料科学与工程（中英文B版） 2018年第4期8卷 150-160页

作者： Gustavo Antonio Jiménez-García elizabeth chavira Jesús Arenas Adriana Tejeda Karla Eriseth MoralesReyes Josué Esaú Romero-Ibarra Jorge Barreto Institute of Materials Research National Autonomous University of Mexico Mexico City 04510 Mexico Faculty of Chemistry National Autonomous University of Mexico Mexico City 04510 Mexico Institute of Physics National Autonomous University of Mexico Mexico City 04510 Mexico

Studies of thermodynamic, electric and magnetic properties were conducted on the （KxSr1-x）CrOz, x = 0.10, 0.15 and 0.50system; adjusted for different crystal sizes （polycrystalline, nano-crystalline and single crystals）. For polycrystals, a solid-statereaction method was used （room temperature, TR, up to 665 °C）. Nano-crystals, a crushing technique with a mechanical mortar wereprocessed at TR. Single crystals were acquired, through fusion method starting from polycrystals pre-manufactured （665 °C） over900 °C. For the methods described above, they all were worked at atmospheric pressure. Studying the thermodynamic in the crystalsmixture were obtained by TGA （thermogravimetric analysis） and DSC （differential scanning calorimetry）. Powder XRD （X-raydiffraction） in the manual grinding mixture a SrCO3 solid solution, at TR was detected. When increasing the temperature, a solidsolution of K2Sr（CrO4）2 is formed. By HRTEM （high-resolution transmission electronic microscope）, crystal sizes 4-12 nm were seen.（K0.50Sr0.50）CrOz composition presents a weak ferromagnetic and an insulating behavior.

关键词： Solid-state reaction solid solutions TGA-DSC XRD HRTEM magnetic behavior

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