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Wu W.,Guangxi University | Cai J.,Guangxi University | Wu X.,Guangxi University | Wang K.,Guangxi University | And 2 more authors.
Journal of Superconductivity and Novel Magnetism | Year: 2013

Cu0.5Zn0.5Fe2O4 precursor was synthesized by solid-state reaction at low heat using CuSO4× 5H2O, ZnSO4×7H2O, FeSO 4×7H2O, and Na2CO3× 10H2O as raw materials. The spinel Cu0.5Zn 0.5Fe2O4 was obtained via calcining precursor above 600°C. The precursor and its calcined products were characterized by thermogravimetry and differential thermal analyses (TG/DTA), Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectrometer (EDS), and vibrating sample magnetometer (VSM). The result showed that highly crystallization Cu 0.5Zn0.5Fe2O4 was obtained when the precursor was calcined at 600°C for 2 h. Magnetic characterization indicated that calcined products above 600°C behaved with strong magnetic properties. The kinetics of the thermal decomposition of the precursor was studied using the TG technique. Based on the KAS equation, the values of the activation energy for the thermal decomposition of the precursor were determined. © 2013 Springer Science+Business Media New York. Source


Wang K.,Guangxi University | Wu X.,Guangxi University | Wu W.,Guangxi University | Hu Y.,Supervision and Inspection Station of Metallurgical Products Quality of Guangxi | Liao S.,Guangxi University
Journal of Superconductivity and Novel Magnetism | Year: 2014

The cubic MnCo2O4 was prepared by calcining MnCO 3-2CoCO3·1.5H2O above 600 °C in air. The precursor and its calcined products were characterized by thermogravimetry and differential scanning calorimetry, Fourier transform infrared spectroscopy, X-ray powder diffraction, scanning electron microscopy, and vibrating sample magnetometer. The result showed that high-crystallized MnCo2O4 with cubic structure [space group Fd-3m(227)] was obtained when the precursor was calcined above 600 °C in air for 6 h. Magnetic characterization indicated that cubic MnCo2O4 behaved weak magnetic behavior at room temperature. The thermal process of the precursor in air experienced three steps, which are: first, the dehydration of 1.5 water molecules, then the decomposition of MnCO3-2CoCO3 into cubic MnO2 and cubic Co3O4, and at last the reaction of MnO 2 with Co3O4 into cubic MnCo2O 4. Based on the KAS equation, the values of the activation energies associated with the thermal process of MnCO3-2CoCO 3·1.5H2O were determined. © 2013 Springer Science+Business Media New York. Source


Li S.,Guangxi University | Wu X.,Guangxi University | Wu W.,Guangxi University | Liao S.,Guangxi University | Hu Y.,Supervision and Inspection Station of Metallurgical Products Quality of Guangxi
Journal of Thermal Analysis and Calorimetry | Year: 2014

(NH4)2In(OH)2PO4 was synthesized by solid-state reaction at low heating temperatures using InCl 3·H2O and (NH4)3PO 4·3H2O as raw materials. The orthorhombic nanocrystalline InPO4 was obtained via calcining (NH 4)2In(OH)2PO4 in air. The (NH 4)2In(OH)2PO4 and its calcined products were characterized by thermogravimetry and differential scanning calorimetry, fourier transform infrared spectroscopy, X-ray powder diffraction, scanning electron microscopy, and ultraviolet-visible spectroscopy (UV-Vis). The result showed that orthorhombic nanocrystalline InPO4 with space group Cmcm(63) was obtained when the product was calcined above 600 C for 3 h. The (NH4)2In(OH)2PO4 and its calcined products behaved with excellent UV-Vis ray transmission ability. © 2013 Akadémiai Kiadó, Budapest, Hungary. Source


Wu X.,Guangxi University | Wu W.,Guangxi University | Li Y.,Guangxi University | Li F.,Supervision and Inspection Station of Metallurgical Products Quality of Guangxi | Liao S.,Guangxi University
Materials Letters | Year: 2015

The rod-like CuFe2O4 was synthesized by a co-precipitation method in ethanol-water solution at room temperature. When evaluated as an anode material for Na-ion battery, the CuFe2O4 sample obtained at 400 °C could deliver a discharge capacity of 281 mAh g-1 in the 20th cycle at 100 mA g-1, which corresponds to 70.5% of the 2nd discharge capacity. Such excellent performance is a result of the formation of mesopores and large specific surface area of the rod-like CuFe2O4. © 2014 Elsevier B.V. All rights reserved. Source


Huang J.,Guangxi University | Huang J.,Guangxi Institute of Metallurgy | Su P.,Guangxi University | Su P.,Guangxi Institute of Metallurgy | And 7 more authors.
Rare Metals | Year: 2010

With strong alkaline anion-exchange resin 717 as the sorbent and NaOH solution as the eluent, a study on the sorption from alkaline solution and elution of vanadium(V), silicon(IV), and aluminium(III) was carried out. Different parameters affecting the sorption and elution process, including temperature, pH values as well as the ratio of resin to solution, were investigated. The results show that sorption degree of vanadium(V) increases with a decrease of pH values, and V(V) ions are easier sorbed than Si(IV) and Al(III) ions under the same conditions. The sorption degree of V(V), Si(IV), and Al(III) at pH 9.14 for 15 min are 90.6%, 33.5%, and 21.6%, respectively. Si(IV), Al(III), and V(V) ions sorbed on 717 resin were eluted by use of 2 mol•L-1 NaOH solution; the desorption degree of V(V), Si(IV), and Al(III) for 5 min are 81.7%, 99.1%, and 99.3%, respectively. © 2010 Journal Publishing Center of University of Science and Technology Beijing and Springer Berlin Heidelberg. Source

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