We have studied the adsorption of elemental S on the surfaces of NiW alloy substrates where elementary sulfur was used as sulfur source.Compared with those previous investigations which used H2S as the sulfur source a...We have studied the adsorption of elemental S on the surfaces of NiW alloy substrates where elementary sulfur was used as sulfur source.Compared with those previous investigations which used H2S as the sulfur source and operated in an ultra-high vacuum chamber,we used elemental sulfur as the sulfur source which does not need an ultra-high vacuum chamber but Ar-H protection atmosphere in the process of sulfuration.After sulfuration,epitaxial LZO buffer layers were deposited on these substrates directly.The samples were investigated by means of AFM,XPS,SEM and XRD in this study.The results show that after sulfuration,S forms a c(2×2)structure at a coverage of 0.5 ML,in agreement with previous results,representing the effectiveness of elemental sulfur during the sulfuration process.The c(2×2)-S superstructure on the surface of the NiW substrates has optimized the La2Zr2O7(LZO)buffer layer texture.展开更多
Although Ni-W substrate with high W content (>5at.%) substrates have been developed successfully, the quality of cube texture and grain boundary, as well as extensive applications in coated conductors should be fur...Although Ni-W substrate with high W content (>5at.%) substrates have been developed successfully, the quality of cube texture and grain boundary, as well as extensive applications in coated conductors should be further improved. In the present work, once intermediate annealing treatment (IAT) at 500°C for 2 h has been employed to optimize the deformation and recrystallization textures in Ni-7at.%W (Ni7W) substrates. As a result, competitive high cube texture content (<10°) and low angle grain boundary fraction (<10°) were realized (98.5% and 91.2%, respectively). A Gd<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> (GZO) buffer layer with strong cube texture and high-quality surface deposited successfully on the Ni7W substrate using the chemical solution deposition method, demonstrating the advanced GZO/Ni7W template is promising for coated conductors.展开更多
基金Supported by the Fundamental Research Funds for the Central Universities(N090602008)The National High Technology Research and Development Program of China(2009AA032401)Shaanxi Provincial Natural Science Foundation(2009JM6002)
文摘We have studied the adsorption of elemental S on the surfaces of NiW alloy substrates where elementary sulfur was used as sulfur source.Compared with those previous investigations which used H2S as the sulfur source and operated in an ultra-high vacuum chamber,we used elemental sulfur as the sulfur source which does not need an ultra-high vacuum chamber but Ar-H protection atmosphere in the process of sulfuration.After sulfuration,epitaxial LZO buffer layers were deposited on these substrates directly.The samples were investigated by means of AFM,XPS,SEM and XRD in this study.The results show that after sulfuration,S forms a c(2×2)structure at a coverage of 0.5 ML,in agreement with previous results,representing the effectiveness of elemental sulfur during the sulfuration process.The c(2×2)-S superstructure on the surface of the NiW substrates has optimized the La2Zr2O7(LZO)buffer layer texture.
文摘Although Ni-W substrate with high W content (>5at.%) substrates have been developed successfully, the quality of cube texture and grain boundary, as well as extensive applications in coated conductors should be further improved. In the present work, once intermediate annealing treatment (IAT) at 500°C for 2 h has been employed to optimize the deformation and recrystallization textures in Ni-7at.%W (Ni7W) substrates. As a result, competitive high cube texture content (<10°) and low angle grain boundary fraction (<10°) were realized (98.5% and 91.2%, respectively). A Gd<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> (GZO) buffer layer with strong cube texture and high-quality surface deposited successfully on the Ni7W substrate using the chemical solution deposition method, demonstrating the advanced GZO/Ni7W template is promising for coated conductors.
