Sol-gel synthesis of MnxNi1-xCo2O4 spinel phase materials: Structural, electronic, and magnetic properties

被引：43

作者：

Dolla, Tarekegn Heliso ^{[1
]}

Pruessner, Karin ^{[2
]}

Billing, David G. ^{[3
,4
]}

Sheppard, Charles ^{[5
]}

Prinsloo, Aletta ^{[5
]}

Carleschi, Emanuela ^{[6
]}

Doyle, Bryan ^{[6
]}

Ndungu, Patrick ^{[1
]}

机构：

[1] Univ Johannesburg, Dept Appl Chem, Energy Sensors & Multifunct Nanomat Res Grp, Ctr Nanomat Sci Res, Doornfontein Campus, Johannesburg, South Africa

[2] Univ KwaZulu Natal, Sch Phys & Chem, Durban, South Africa

[3] Univ Witwatersrand, Sch Chem, DST NRF Ctr Excellence Strong Mat, Johannesburg, South Africa

[4] Univ Witwatersrand, Sch Chem, Mol Sci Inst, Johannesburg, South Africa

[5] Univ Johannesburg, Dept Phys, Chromium Res Grp, Auckland Pk, Johannesburg, South Africa

[6] Univ Johannesburg, Dept Phys, Auckland Pk, Johannesburg, South Africa

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 742卷

基金：

新加坡国家研究基金会;

关键词：

Nanostructured materials; Oxide materials; Sol-gel processes; Magnetic measurements; Photoelectron spectroscopies; X-ray diffraction; THIN-FILMS; ELECTRICAL-PROPERTIES; NICOMNO4; NANOPARTICLES; OPTICAL-PROPERTIES; NICKEL COBALTITE; NTC THERMISTOR; NI; COMPLEXES; OXIDES;

D O I：

10.1016/j.jallcom.2018.01.139

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A series of spinel-type MnxNi1-xCo2O4 (x = 0, 0.3, 0.5, 0.7, 1) oxides were synthesized by using a citrate sol-gel technique. The structural, magnetic and electronic properties of the oxides with different Mn content were investigated using X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), vibrating sample magnetometer (VSM) and X-ray photoelectron spectroscopy (XPS). The XRD and FTIR studies revealed that MnxNi1-xCo2O4 formed in a cubic structure for all the compositions synthesized. Transmission electron microscopy (TEM) studies show cubic nano-plates for x = 0 and on increasing Mn concentration, agglomerated nanoparticles with sphere-like shape are observed with a particle size in the range of 11.7 nm-22.1 nm. This is in close agreement with the results of XRD analysis. The Mn 2p, Ni 2p, and Co 2p XPS spectra reveal the coexistence of Mn2+, Mn3+, Ni2+, Ni3+, Co2+, and Co3+ species on the surface of MnxNi1-xCo2O4 samples in differing proportions. The measurements of magnetic properties at room temperature show that the samples have some ferromagnetic behaviour. The saturation magnetization, remnant magnetization, and coercivity of the nanoparticles vary significantly with a concentration of Mn, which tends to be distributed in both tetrahedral and octahedral positions of the spinel lattice. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：78 / 89

页数：12

共 52 条

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