Microwave assisted synthesis and characterization of Co doped Cu ferrite nanoparticles

Azam, Ameer

doi:10.1016/j.jallcom.2012.06.068

Cited by 61 publications

(18 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figures (a) and (b) show the frequency dependence of the real ( Z ′) and imaginary ( Z ″) parts of the impedance, respectively, at room temperature from 50 Hz to 4 MHz. Z ′ decreases as the frequency gradually increases, which is consistent with the previous report . The real component of impedance decreases by nearly five orders of magnitude going from low to high frequency.…”

Section: Resultssupporting

confidence: 92%

“…In the high‐frequency region, the dielectric loss for all samples decreases rapidly with increasing frequency. This is because only a small amount of energy is required for electron transfer between two Fe ions at the octahedral site, because the grains have low resistivity …”

Section: Resultsmentioning

confidence: 99%

“…Z′ decreases as the frequency gradually increases, which is consistent with the previous report. 26 The real component of impedance decreases by nearly five orders of magnitude going from low to high frequency. At the same time, the Z″ spectra of samples B and D show a step below 1 kHz, and then decrease with frequency.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Magnetic and Impedance Properties of Nanocomposite CoFe₂O₄/Co_0.7Fe_0.3 and Single‐Phase CoFe₂O₄ Prepared Via a One‐Step Hydrothermal Synthesis

Zan

et al. 2013

J. Am. Ceram. Soc.

View full text Add to dashboard Cite

Using a one‐step hydrothermal method and at different stirring speeds (Vs), we have synthesized different types of CoFe2O4‐based magnetic nanocrystalline samples. With increasing Vs, the sample changes from a nanocomposite of CoFe2O4/Co0.7Fe0.3 (CFO/CF) to single‐phase CoFe2O4 (CFO). The maximum magnetization, 88.9 emu/g, and coercivity, 3010 Oe, were obtained when Vs = 0. As Vs increases, the saturation magnetization Ms decreases, because the amount of soft magnetic CF phase decreases. A clear enhancement in the remanence, Mr, was observed, with the maximum Mr/Ms = 0.67; the coercivity Hc also exhibits a local maximum for the sample with Vs = 200 r/min. These trends can be explained well by the interplay between dipolar interaction, magnetocrystalline anisotropy, and shape anisotropy. The stirring speed also influences the impedance of the materials; the related mechanism is discussed.

show abstract

Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic and Impedance Properties of Nanocomposite CoFe₂O₄/Co_0.7Fe_0.3 and Single‐Phase CoFe₂O₄ Prepared Via a One‐Step Hydrothermal Synthesis

Zan

et al. 2013

J. Am. Ceram. Soc.

View full text Add to dashboard Cite

show abstract

“…This method has gained much attention in recent years because, the as-prepared materials are pure, ultra fine, and relatively strain free with a narrow size distribution. Also, this method offers many advantages over the other mentioned methods, such as simplicity, high crystallinity, and its adequacy for the preparation of large quantities of products without the need for higher processing temperatures [9,20].…”

mentioning

confidence: 99%

Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts

Manikandan

Durka²,

Antony

2015

J Supercond Nov Magn

View full text Add to dashboard Cite

Spinel Mn x Co 1−x Fe 2 O 4 ; x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) nanoparticles were synthesized by ureaassisted auto combustion method using nitrates of Co, Mn and Fe as the starting materials and urea as the fuel. X-ray diffraction (XRD) analysis showed that all composition was found to have a cubic spinel structure. The average crystallite size of the samples was estimated using the Debye-Scherrer formula and was found to be in the range of 22.62 and 36.45 nm. The lattice parameter increased from 8.432 to 8.457Å with increasing the Mn 2+ content, which was determined by Rietveld analysis. High-resolution scanning electron microscopy (HR-SEM) and high-resolution transmission electron microscopy (HR-TEM) analyses were used to study the morphological variation, and the results showed a nanosized particlelike morphology. Energy-dispersive X-ray (EDX) results showed that the composition of the elements was relevant as expected from the synthesis. The bandgap energy of the pure CoFe 2 O 4 was estimated to be 2.33 eV from UV-visible diffuse reflectance spectroscopy (DRS). With the increase of Mn 2+ ion, the bandgap energy increased from 2.35 to 2.42 eV. The magnetic properties of the A. Manikandan ( ) · S. samples were investigated at room temperature by using a vibrating sample magnetometer (VSM). The magnetic hysteresis (M-H) loop confirmed the superparamagnetic nature of pure CoFe 2 O 4 and a weak ferromagnetic behavior of Mn 2+ doped CoFe 2 O 4 samples with specific saturation magnetization in the range of 55.16 ± 24 and 66.92 ± 05 emu/g. All compositions of spinel Mn x Co 1−x Fe 2 O 4 samples were successfully tested as catalyst for the conversion of benzyl alcohol, which has resulted in 62.75 and 92.62 % conversion efficiency of CoFe 2 O 4 and Mn 0.5 Co 0.5 Fe 2 O 4 , respectively.

show abstract

“…Hence, the result is definitive evidence to suggest that the sample does not contain any other element and are indeed free from other impurities. The peaks at 2.1-2.2 keV in the EDX spectra are due to the gold, which is coated on the samples before recording SEM [25]. …”

Section: Edx Analysis Of the Ruxm1-xal2o3 Npsmentioning

confidence: 99%

Microwave-Assisted Synthesis And Characterizatıon of Novel RuxM1-xAl2O3 Nanoparticles

Köksal

Hamad

2015

KSU J. Eng. Sci.

View full text Add to dashboard Cite

ABSTRACT:In this study, three metal composed of nanostructures of RuxM1-xAl2O3 have been successfully synthesized by a simple and rapid microwave-assisted method using thiourea as the fuel and ethylene glycol (EG) as the reducing agent. In comparison with conventional heating, microwave-assisted method shortens the reaction time. The morphology, particle size and microstructure were analyzed using SEM and XRD. Microwave irradiation has yielded nanosized spherical phase particles. The mean grain size of the nanoparticles less than 100 nm. The FT-IR studies confirms the presence of metal-oxygen and metal-oxygen-metal bond. XRD and SEM of the synthesized nanoparticles show that the prepared nano compounds have low crystallinity and sphere and flower-like shape. Flower shape Ru0.63Co0.37Al2O3, Ru0.93Ni0.07Al2O3 and Ru0.54Cu0.46Al2O3 particles were obtained. Generally, the crystallite sizes were found in the range of 41-94 nm. The EDX analysis indicated that the elements of Ru, Fe, Co, Ni, Cu and Al existed in the products. The surface treatment of spray gold for elimination of charged effects were responsible for the signals of gold in the EDX analysis of the products. In other words, no impurities like N, S, P, Cl, etc. were detected except for Ru, Fe, Co, Ni, Cu and Al elements, indicating the nanoparticles were pure. Keywords: Nanoparticles, microwave-assisted, metal oxideYeni RuxM1-xAl2O3 Nano Parçacıkların Mikrodalga Destekli Sentezi ve Tanımlanması ÖZET: Bu çalışmada, yapısında üç metal bulunan nanoyapılar basit ve hızlı mikrodalga-yardımlı metod ile sentezlenmiştir. Bu sentezlerde tiyoüre yakıt olarak kullanılırken, etilen glikol (EG) yüzey gerilimini düşürücü ve indirgen olarak kullanılmıştır. Bilinen eski yöntemlerle kıyaslandığında bu yöntem reaksiyon süresini kısaltmıştır. Oksitlerin morfolojisi, parça büyüklüğü ve mikroyapısı SEM ve XRD ile analiz edilmiştir. Mikrodalga radyasyonu nanobüyüklükte küresel fazlı parçacıklar üretmiştir. Nanoparçacıkların ortalama tanecik boyutu 100 nm'den küçüktür. FT-IR çalışmaları metal-oksijen ve metal-oksijen-metal bağlarının varlığını doğrulamaktadır. Sentezlenen nanopartiküllerin XRD ve SEM sonuçları nano bileşiklerin düşük kristaliniteye sahip olduğunu, küresel ve çiçek-benzer şekillerde olduğunu göstermektedir. Çiçek tipi Ru0.63Co0.37Al2O3, Ru0.93Ni0.07Al2O3 ve Ru0.54Cu0.46Al2O3 parçacıkları elde edilmiştir. Genelde, kristal büyüklükleri 41-94 nm aralığındadır. EDX analizleri sentezlenen bileşiklerin yapısında Ru, Fe, Co, Ni, Cu ve Al elementlerinin varlığını doğrulamaktadır. Bileşiklerin EDX analizlerinde gözlemlenen Altın elementine ait pik, yük etkisini yok etmek amacıyla yüzeye püskürtülen Altın'a aittir. Ek olarak, yapılarda N, S, P ve Cl gibi safsızlıkların olmayışı ve yalnız Ru, Fe, Co, Ni, Cu ve Al elementlerin gözlemlenmesi, nanoparçacıkların saf olduğunu göstermektedir.

show abstract

Microwave assisted synthesis and characterization of Co doped Cu ferrite nanoparticles

Cited by 61 publications

References 44 publications

Magnetic and Impedance Properties of Nanocomposite CoFe₂O₄/Co_0.7Fe_0.3 and Single‐Phase CoFe₂O₄ Prepared Via a One‐Step Hydrothermal Synthesis

Magnetic and Impedance Properties of Nanocomposite CoFe₂O₄/Co_0.7Fe_0.3 and Single‐Phase CoFe₂O₄ Prepared Via a One‐Step Hydrothermal Synthesis

Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts

Microwave-Assisted Synthesis And Characterizatıon of Novel RuxM1-xAl2O3 Nanoparticles

Contact Info

Product

Resources

About

Microwave assisted synthesis and characterization of Co doped Cu ferrite nanoparticles

Cited by 61 publications

References 44 publications

Magnetic and Impedance Properties of Nanocomposite CoFe2O4/Co0.7Fe0.3 and Single‐Phase CoFe2O4 Prepared Via a One‐Step Hydrothermal Synthesis

Magnetic and Impedance Properties of Nanocomposite CoFe2O4/Co0.7Fe0.3 and Single‐Phase CoFe2O4 Prepared Via a One‐Step Hydrothermal Synthesis

Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts

Microwave-Assisted Synthesis And Characterizatıon of Novel RuxM1-xAl2O3 Nanoparticles

Contact Info

Product

Resources

About

Magnetic and Impedance Properties of Nanocomposite CoFe₂O₄/Co_0.7Fe_0.3 and Single‐Phase CoFe₂O₄ Prepared Via a One‐Step Hydrothermal Synthesis

Magnetic and Impedance Properties of Nanocomposite CoFe₂O₄/Co_0.7Fe_0.3 and Single‐Phase CoFe₂O₄ Prepared Via a One‐Step Hydrothermal Synthesis