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Zuo M.-M.,Sun Yat Sen University | Xiong X.-M.,Sun Yat Sen University | Zeng N.,Zhongshan Research Institute of Applied Chemistry | Li Z.-B.,Zhongshan Research Institute of Applied Chemistry | Yang D.-L.,Zhongshan Research Institute of Applied Chemistry
Gongneng Cailiao/Journal of Functional Materials | Year: 2010

By means of a gas bubble liquid membrane (GBLM) process the Ni0.3Zn0.7Fe2O4 precursor was prepared from the precipitation reaction of FeCl3, NiCl2 and ZnCl2 mix aqueous solution with NaOH aqueous solution with the use of sodium stearate as coating agent. Pure Ni0.3Zn0.7Fe2O4 magnetic materials were obtained after the precursor was cured with hydrothermal (HT) method at subcritical temperature of water, which was verified by XRD. VSM measurements show that saturation magnetization of the ferrite is up to be 87.56 A· m2/kg, and magnetic coercivity Hc to be 14 A · m2/kg. These implied the potential application of GBLM-HT process in the large scale production of ferrites at low temperature. Source


Yang D.-L.,Zhongshan Research Institute of Applied Chemistry | Li Z.-B.,Zhongshan Research Institute of Applied Chemistry | Li Z.-B.,Zhongshan Winner New Material Cop Ltd | Zeng N.,Zhongshan Research Institute of Applied Chemistry | And 2 more authors.
Gongneng Cailiao/Journal of Functional Materials | Year: 2011

By the novel gas bubble liquor membrane (GBLM) process the precursor nanoparticle of Ni0.7Zn0.3Fe2O4 ferrite was prepared with the coprecipitation reaction of aqueous solution of Zn2+, Ni2+ and Fe3+ with OH- in a gas bubble liquor membrane carried out, use of the aqueous solution of sodium stearate as the coating agent. The precursor was characterized by means of elemental analysis, FT-IR, SEM and XRD. The experimental results had indicated that the mole ratio of Zn2+, Ni2+ and Fe3+ in the substrate solution was kept accurately to the mole ratio in the precursor. Ni0.7Zn0.3Fe2O4 ferrites were obtained after the precursor was sintered at 300, 400, 500, 600, 700 or 800°C respectively. The ferrites were determined with XRD and VSM. On the basis of the experimental results the granule size, σs, σr and jHc of the ferrite gained from the precursor sintered at 700°C were found to be 26.92nm, 64.22A·m2/kg, 14.25A·m2/kg and 16kA/m respectively. A heat-resistant ferrite fluid was made with the dispersion of Ni0.7Zn0.3Fe2O4 ferrite into synthetic oil. Source


Yang D.-L.,Zhongshan Research Institute of Applied Chemistry | Li Z.-B.,Zhongshan Research Institute of Applied Chemistry | Li Z.-B.,Zhongshan Winner New Material Cop Ltd | Zeng N.,Zhongshan Research Institute of Applied Chemistry | And 3 more authors.
Gongneng Cailiao/Journal of Functional Materials | Year: 2013

Ni-Zn-Fe hydroxide as a precursor was prepared using the coprecipitation of aqueous solution of mole ratio n(Ni2+):n(Zn2+):n(Fe3+)=0.6:0.4:2.0 with OH- in gas bubble liquid membrane. The precursor was characterized by means of elemental analysis, EDS, FT-IR, HRTEM, VSM, DSC and XRD. The precursor showed a five phase mixture of 0.6Ni(OH)2(H2O)0.75, (0.4-n)Zn(OH)2, (2-2m-2n)Fe(OH)3, mFe2O3 and nZnFe2O4 by XRD pattern. The microstructure of the precursor shows a large amount of spiral molecular clusters with 2-8nm size, a few of subcrystalline structures with about 10nm size and some disorder point contrasts around the molecular clusters and subcrystalline structures. The precursor can dehydrate slowly at room temperature into Fe2O3, ZnO and water. Fe2O3 and ZnFe2O4 subcrystalline structure were detected from the fresh precursor, which implied that spiral molecular clusters evolve by Fe(OH)3 preferentially dehydrates into Fe2O3 crystal nucleus, Zn(OH)2 dehydrates into ZnO, followed by nascent ZnO molecule self-assembles to Fe2O3 crystal nucleus into ZnFe2O4 subcrystalline structure, during the precursor was prepared. The magnetic property for the precursor was attributed to the presences of Fe2O3 and ZnFe2O4 ferrite both. Source

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