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【期刊论文】Platinum Catalyzed Growth of NiPt Hollow Spheres with an Ultrathin Shell
王荣明
,-0001,():
-1年11月30日
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【期刊论文】Platinum catalyzed growth of NiPt hollow spheres with an ultrathin shell
王荣明
,-0001,():
-1年11月30日
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【期刊论文】Magnetite hollow spheres: solution synthesis, phase formation and magnetic property
王荣明, Qian Sun • Zheng Ren • Rongming Wang • Weimeng Chen • Chinping Chen
J Nanopart Res (2011) 13: 213-220,-0001,():
-1年11月30日
Polycrystalline magnetite hollow spheres with diameter of about 200nm and shell thickness of 30–60 nm were prepared via a facile solution route. For the reaction, ethylene glycol (EG) served as the reducing agent and soldium acetate played the role of precipitator. In addition, polyvinylpyrrolidone (PVP) served as a surface stabilizer. The morphologies and structures were characterized by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The intermediate products at different stages were also studied to shed light on the evolution of phase formation. It revealed that the hollow structure formed via self-assembly of nanocrystallites (about 15 nm) using sodium acetate as mild precipitator. Evidences further pointed out that the Ostwald ripening process well explained the growth mechanism of the hollow structure. Magnetization measurements showed that the coercivity of magnetite hollow spheres at low temperature is about 200 Oe and the saturation magnetization is about 83 emu g-1, roughly 85% that of the bulk phase, close to the value of its solid counterpart. In addition, a freezing transition was observed at 25 K.
Magnetite hollow spheres Phase formation Magnetic property
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【期刊论文】Magnetic anisotropy and anomalous transitions in TbMnO3 thin films
王荣明, Yimin Cui, Yufeng Tian, Aixian Shan, Chinping Chen, and Rongming Wang
Applied Physics Letters,-0001,():
-1年11月30日
TbMnO3 thin films with different crystallographic orientations were deposited epitaxially on LaAlO3 [100] and SrTiO3 [100] single crystal substrates by using pulsed laser deposition. Magnetization measurements were performed along the [110], [_110], and [001] directions of the films. Obvious magnetic anisotropy and low temperature ferromagnetism were found. Transitions at T_10, 32, 120, and 125K along different directions are observed. The susceptibility anomalies, remarkably anisotropic, are discussed on the frame of the domain wall and strain-induced distortion. Particularly, the lattice mismatch and the anisotropic thermal expansion between the films and substrates are likely responsible for the distortion behaviors.
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【期刊论文】Layer Resolved Structural Relaxation at the Surface of Magnetic FePt Icosahedral Nanoparticles
王荣明
,-0001,():
-1年11月30日
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41浏览
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