Structural and physicochemical properties of nickel manganite NiMn2O4-delta synthesized by sol-gel and ultra sound assisted methods
Alburquenque, D; Troncoso, L; Denardin, JC; Butera, A; Padmasree, KD; Ortiz, J; Herrera, F; Marco, JF; Gautier, JL
| HERO ID | 4132517 |
|---|---|
| In Press | No |
| Year | 2016 |
| Title | Structural and physicochemical properties of nickel manganite NiMn2O4-delta synthesized by sol-gel and ultra sound assisted methods |
| Authors | Alburquenque, D; Troncoso, L; Denardin, JC; Butera, A; Padmasree, KD; Ortiz, J; Herrera, F; Marco, JF; Gautier, JL |
| Journal | Journal of Alloys and Compounds |
| Volume | 672 |
| Page Numbers | 307-316 |
| Abstract | In this work we present the structural, magnetic and surface characterization of the ceramic nickel manganite oxide NiMn2O4-delta synthesized by two methods: sol-gel and ultrasound-assisted sol-gel using nitrate salts as precursors. We have characterized the non-stoichiometric samples NiMn2O4-delta using different physicochemical analyses. X-ray diffraction and Rietveld refinement of the X-ray data indicated that the samples crystallize in the Fd3m space group characteristic of cubic spinel-related oxides. The specific surface area of the oxides was 1.3 m(2)/g (SG) and 16.3 m(2)/g (UASG). SEM results showed particle agglomerates of 1.05 mu m ( SG) and 0.85 mu m ( UASG). Temperature dependence magnetization measurements were performed and a ferrimagnetic transition was identified at 103 K and 105 K depending on the preparation method ( SG and UASG, respectively). The observed Curie constant was found to vary from 7.4 to 7.7 cm(3) K mol(-1) and hysteretic magnetization vs. applied field curves at different temperatures were obtained. XPS studies of these oxides reveal the presence of Ni2+, Mn2+, Mn3+ and Mn4+ ions at the surface. A probable ionic distribution as a function of the synthesis method is proposed. (C) 2016 Elsevier B.V. All rights reserved. |
| Doi | 10.1016/j.jallcom.2016.02.090 |
| Wosid | WOS:000373464000043 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Keyword | Nickel manganite; Spinel oxides; Magnetic properties; X-ray diffraction; XPS |