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Proceedings ArticleDOI

Influence of Cr3+ ions on CoFe2O4 nanoparticles to increase the magnetic behaviour by exchange anisotropy

24 May 2016-Vol. 1731, Iss: 1, pp 050146
TL;DR: Chromium substituted cobalt ferrite (CoFe2-xCrxO4) nanoparticles were prepared by smouldering combustion route as discussed by the authors, which plays a major role on particle size, surface morphology and magnetic behaviour of CoFe2O4 nanoparticles.
Abstract: Chromium substituted cobalt ferrite (CoFe2-xCrxO4) nanoparticles were prepared by smouldering combustion route. Substitution of Chromium ions plays a major role on particle size, surface morphology and magnetic behaviour of CoFe2O4 nanoparticles. The prepared material of chromium substituted cobalt ferrite nanoparticles were characterized by powder XRD, Raman, FE-SEM and VSM.
Citations
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Journal ArticleDOI
TL;DR: In this paper, a ternary CoFeCr hydroxide microsphere composite for enhanced water oxidation was fabricated using a facile electrodeposition method, which showed excellent electrocatalytic performance for oxygen evolution reaction (OER) in alkaline media, whose onset potential is only around 1.43

58 citations

References
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Journal ArticleDOI
TL;DR: Mossbauer and Raman spectroscopic studies were carried out on CoFe 2 O 4 particles synthesized with size ranging from 6 to 500mm (bulk) as mentioned in this paper.

413 citations

Journal ArticleDOI
TL;DR: In this paper, the powder X-ray diffraction (XRD) patterns confirm the single phase spinel structure for the synthesized materials and the crystallite size was calculated from the most intense peak (3-1-1) using the Scherrer formula.

339 citations

Journal ArticleDOI
TL;DR: In this article, ZnO and iron oxide thick film gas sensors were fabricated using screenprinting technology on glass substrates that had silver interdigitated electrodes, and the sensor was used to detect methanol, ethanol and propanol with a concentration range of 0-8000ppm.
Abstract: Zinc and iron oxide thick film gas sensors were fabricated using screen-printing technology on glass substrates that had silver interdigitated electrodes. The sensor was used to detect methanol, ethanol and propanol with a concentration range of 0–8000 ppm. Using the formula to calculate a change in resistance, ΔR = Rgas − Rair, resistance was seen to increase linearly alongside increasing concentrations of the gas vapours. The sensor showed the highest sensitivity to propanol followed by ethanol and methanol when the operating temperature was 25 °C. The sensitivities (slope of graphs) of methanol, ethanol and propanol changed from 0.07, 0.5, and 3.54 to 0.075, 0.115, and 0.5 Ω/ppm when the operating temperature was increased from 25 to 50 °C. The response/recovery times of the sensor for 4000 ppm at room temperature were, 10/10, 15/20 and 40/70 s for methanol, ethanol and propanol, respectively. X-ray diffraction (XRD) was used to examine the final composition of the film, while scanning electron microscopy (SEM) was used to examine the final composition of grain size. The final composition has two phases: ZnO and ZnFe2O4

174 citations

Journal ArticleDOI
TL;DR: In this paper, the Ni-Zn ferrite powder of a Ni0.3Zn0.7Fe2O4 composition was synthesized by sol-gel route using metal acetates at low temperatures.

112 citations