Sol-gel synthesis of triclinic CoV2O6 polycrystals

Author(s)

von Dreifus, Driele ^{[1, 2]} ; Pereira, Rodrigo ^[3] ; Rodrigues, Ariano D. ^[2] ; Pereira, Ernesto C. ^[1] ; de Oliveira, Adilson J. A. ^[2]

Affiliation

^[1] Univ Fed Sao Carlos UFSCar, Dept Quim, Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos UFSCar, Dept Fis, Sao Carlos, SP - Brazil

^[3] Inst Fed Educ Ciencia & Tecnol Mato Grosso IFMT, Sao Vicente, MT - Brazil

• Document type: Journal article
• Source: CERAMICS INTERNATIONAL; v. 44, n. 16, p. 19397-19401, NOV 2018.
• Web of Science Citations: 0

Abstract

In this paper, a new chemical route synthesis for gamma-CoV2O6 is proposed. Based on the CoO-V2O5 phase diagram a study of temperature and calcination times for pure gamma-CoV2O6 obtainment is described. X-ray diffraction and Raman spectroscopy experiments revealed the triclinic crystals structure belonging to P-1 spatial group. FEG-SEM images showed that the resulting grains present elongated shape. Rietveld analysis revealed a crystalline anisotropy with preferential crystallographic orientation in the {[}2 0 - 1] and {[}1 3 0] planes. The calculated mean crystallite size evidences that the crystallite dimensions are significantly different in the parallel and perpendicular directions. The magnetic properties measurements evidenced an antiferromagnetic transition at 7 K and a detailed view of the magnetization isotherms confirmed a noticeable step-like behavior below T-N, characteristic of field-induced transitions. (AU)

• FAPESP's process: 09/54082-2 - Acquisition of a vibranting sample magnetometer coupled with a superconducting quantum interference device assensor (Squid-VSM) with cryogenic closed cycle
• Grantee: Ernesto Chaves Pereira de Souza
• Support Opportunities: Multi-user Equipment Program
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC