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Wang A.-D.,Beijing General Research Institute of Mining And Metallurgy | Wang A.-D.,BGRIMM Advanced Materials Science and Technology Co. | Liu Z.-Y.,CAS Institute of Physics | Zhang P.-J.,CAS Institute of Physics | And 3 more authors.
Wuli Xuebao/Acta Physica Sinica | Year: 2013

The resistance relaxation in Au/SrTiO3/Au sandwiches with bipolar resistance switching has been investigated by the low frequency analysis. The power spectral density of the conducting current fluctuation in the high resistance state and the low resistance state shows 1/f behaviors. By contrast experiment, the low frequency noise for the high resistance state is ascribed to the Schottky barrier under reverse bias and the oxygen vacancy diffusion, while the noise in the low resistance state is due to the carriers fluctuation arising from the oxygen vacancy migration. The resistance relaxation can be further understood as the diffusion of oxygen vacancies under an electric field. © Chinese Physical Society. Source


Gao F.,Beijing General Research Institute of Mining And Metallurgy | Gao F.,BGRIMM Advanced Materials Science and Technology Co. | Gao F.,Strengthen | Xu H.,Beijing General Research Institute of Mining And Metallurgy | And 5 more authors.
Fenmo Yejin Jishu/Powder Metallurgy Technology | Year: 2014

Cr7C3-NiCr and Cr23C6-Ni coatings were deposited by high velocity oxy-fuel processes, and were comparis with Cr3C2-NiCr coating. The microstructure of the coating was analyzed by scanning electron microscopy(SEM). The microhardness and thermal shock property were measured. The results indicate that the grain size of Cr7C3-NiCr coatings is 0.5~2 μm and the hardness Hv0.3 of the coating is 8.53 GPa. The times of water quenching at 950℃ for Cr7C3-NiCr coatings are more than 113, they are better than Cr3C2-NiCr and Cr23C6-Ni coatings. ©, 2014, Beijing Research Institute of Powder Metallurgy. All right reserved. Source

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