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【期刊论文】Synthesis, growth mechanism and gas-sensing properties of large-scale CuO nanowires
刘仲武, M.L. Zhong, D.C. Zeng, Z.W. Liu *, H.Y. Yu, X.C. Zhong, W.Q. Qiu
Acta Materialia, 58 (2010): 5926-5932,-0001,():
-1年11月30日
Large-scale CuO nanowires were in situ grown on Cu substrate by a very simple catalyst-free thermal oxidation process in atmosphere. The structure characterization revealed that these nanowires are monoclinic structured single crystallites with mean diameters of 60–200 nm. The effects of growth time and temperature on the morphology of the nanowires were investigated. It is found that the growth time has an important effect on the length and density of the nanowires, whereas the growth temperature has a distinct influence on the nanowire diameter. Different from the vapor–solid (V–S) mechanism, the growth of nanowires is found to be based on the Cu ion diffusion. The ethanol-sensing properties of these CuO nanowires were also studied based on a self-designed prototype and the results indicated that these large-scale nanowires are indeed a good candidate for gas-sensing applications.
Nanostructures, CuO nanowires, Thermal oxidation, Gas-sensing properties
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【期刊论文】Phase equilibria of the Co-Ni-Zr system at 1198 K
刘仲武, Guojun Zhou a, b, Zhongwu Liu a, Zhanpeng Jin b, Dechang Zeng a
Materials Letters, 64 (2010): 549-551,-0001,():
-1年11月30日
The isothermal section of the phase diagram of the Co-Ni-Zr ternary system at 1198 K has been investigated by means of diffusion triple and electron microprobe analysis. This isothermal section consists of six threephase regions. The homogeneity ranges of Co23Zr6, Co2Zr, CoZr, Ni5Zr, Ni7Zr2 and NiZr are about 16.7%-18.8 at.%Zr, 28.6%-32.3 at.%Zr, 49.2%-51.7 at.%Zr, 16.0%-18.7 at.%Zr, 22.3%-24.1 at.%Zr and 49.8%-52.1 at.%Zr, respectively; CoZr2 and NiZr2 are nearly linear compounds. The largest olubilities of Ni in Co23Zr6, Co2Zr and CoZr are about 4.9 at.%Ni, 5.4 at.%Ni and 4.5 at.%Ni, respectively. CoZr2 and NiZr2 form a continuous solid solution (Co,Ni)Zr2. No ternary compound is observed.
Diffusion, Phase diagrams, Metals and alloys
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【期刊论文】冷却速度对快淬Fe-Si-B-Cu合金结构和磁性能的影响
刘仲武, 李宇明, 余红雅, 曾德长
《热加工工艺》,2010,39(6):135~138,-0001,():
-1年11月30日
采用单辊旋淬法,以不同的轮辊转速(50、40、30和25m/s)制备高Fe含量Fe82.65Cu1.35Si2B14非晶合金薄带,研究了冷却速度对快淬合金结构和性能的影响。结果表明:随冷却速度的降低,淬态Fe82.65Cu1.35Si2B14合金的条带厚度逐渐增大,合金由完全的非晶态结构转变为非晶与纳米晶的混合结构;同时,随冷却速度的降低,一次晶化温度下降,材料的饱和磁感应强度逐渐增加,在轮辊转速为25m/s时,淬态合金的饱和磁感应强度达到1.4T。
冷却速度, 非晶, 微观结构, 磁性能
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刘仲武, 戴慧萃, 曾德长, 余红雅
磁性材料及器件,2010,41(1):20~23,-0001,():
-1年11月30日
以δ-FeOOH为前驱体,采用沸腾回流法直接合成了尖晶石结构的MnZn铁氧体纳米颗粒。用X射线衍射仪(XRD)、透射电镜(TEM)和振动样品磁强计(VSM)对其相成分、显微结构和磁性能进行了表征。详细探讨了共沉淀的pH值和回流反应时间对生成物化学组成和磁性能的影响。结果表明,通过调节pH值和回流时间可以得到从小于10nm到大于20nm不同粒径的锰锌铁氧体颗粒,获得完全产物的最佳回流时间为6h。pH值对反应剧烈程度及磁性能有很大影响,共沉淀pH值为13.0左右时获得的制备态纳米粉末尺寸为20nm,饱和磁化强度达46A·m2/kg。
MnZn 铁氧体, 沸腾回流法, 纳米颗粒, pH 值, 回流时间, 磁性能
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【期刊论文】Phase equilibria in the Fe-Ti-Zr system at 1023K
刘仲武, Guojun Zhou, Dechang Zeng∗, Zhongwu Liu
Journal of Alloys and Compounds, 490 (2010): 463-467,-0001,():
-1年11月30日
Phase relations for Fe-Ti-Zr ternary system at 1023K have been investigated by means of diffusion triple together with electron probe microanalysis technique, a series of tie-lines and tie-triangles have been determined and the isothermal section at 1023K has been established, and seven three-phase fields have been figured out. It was found that all of the Fe-Zr and Fe-Ti binary phases show large ternary solubility, and Zr and Ti can substitute for each other to a certain degree. The largest solid solubility of Ti in Fe2Zr and in FeZr3 is about 8.5 at.% Ti and 35.7 at.% Ti, and of Zr in Fe2Ti and FeTi is about 5.6 at.% Zr and 6.3 at.% Zr, respectively. The solubility range of Fe2Ti, FeTi, Fe2Zr and FeZr3 is 64.9 72.7 at.% Fe, 46.6-49.1 at.% Fe, 65.8-71.7 at.% Fe and 20.9-24.3 at.% Fe, respectively. No ternary compound was found.
Intermetallics, Sintering, Phase diagrams, Diffusion
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