YBCO high temperature coated conductors are the most promising candidate for large scale superconducting transmission cables and fault current limiters.A modified TFA-MOD method was applied to prepare YBCO layer on Ro...YBCO high temperature coated conductors are the most promising candidate for large scale superconducting transmission cables and fault current limiters.A modified TFA-MOD method was applied to prepare YBCO layer on Rolling Assisted Biaxially Textured Substrate(RABiTS)with textured Y 2 O 3/YSZ/CeO 2 buffer layers,resulting in reduced time and cost of fabrication.By using Cu naphthenate instead of Cu(TFA)2,the pyrolysis time of the YBCO precursors was reduced significantly.YBCO films with thickness of 2μm were fabricated with multiple-coating and annealed at high temperature for 2 h.X-ray diffraction analysis revealed that the films were c-axis oriented.The preliminary results of YBCO films yielded 0.2 MA/cm 2 at 77 K and self field.It is believed current carrying ability of YBCO films could be further improved by reducing the reaction rate at the interface between the buffer layer and superconducting layer.展开更多
Superconducting YBa2Cu3O7-x films were grown on the CeO2/YSZ/Y2O3 buffered rolling assisted biaxial textured Ni-5at%W substrate by MOCVD method.Self-made Y(DPM)3,Ba(DPM)2,and Cu(DPM)2 were used as the precursors.Diffe...Superconducting YBa2Cu3O7-x films were grown on the CeO2/YSZ/Y2O3 buffered rolling assisted biaxial textured Ni-5at%W substrate by MOCVD method.Self-made Y(DPM)3,Ba(DPM)2,and Cu(DPM)2 were used as the precursors.Different ratios of the precursors were applied to optimize the hetero-epitaxial structure and property of YBCO films.X-ray diffraction revealed that YBCO films had excellent in plane texture with full width at half maximum(FWHM)value of(103)=5.6°-6.5°and out-of-plane texture with FWHM of(005)=3.1°-3.7°.The superconductivity of YBCO films was measured.The relationship between the ratios of the precursors and the property of the films were discussed in detail.展开更多
CeO2 seed layer was deposited on rolling-assisted biaxially textured metal substrates by direct-current(DC)magnetron reactive sputtering.The effect of deposition temperature on epitaxial orientation of CeO2 thin films...CeO2 seed layer was deposited on rolling-assisted biaxially textured metal substrates by direct-current(DC)magnetron reactive sputtering.The effect of deposition temperature on epitaxial orientation of CeO2 thin films was examined.High quality CeO2 layers were achieved at deposition temperature from 750℃to 850℃.Subsequently yttria-stabilized zirconia(YSZ)and CeO2 films were deposited to complete the buffer layer structure via the same process.The best samples exhibited a highly biaxial texture,as indicated by FWHM(full width half maximum)values in the range of 4°-5°,and 2°-4°for in-plane and out-of-plane orientations,respectively.Secondary ion mass spectrometer analysis confirmed the effective prevention of buffer layer against Ni and W metal interdiffusion.Atomic force microscope observations revealed a smooth,dense and crack-free surface morphology,which provided themselves as the good buffer structure to the YBa2Cu3O7-δ(YBCO)coated conductors.展开更多
基金National Science Foundation of China(51002024)"863"High-Tech Project(2007AA03Z201)
文摘YBCO high temperature coated conductors are the most promising candidate for large scale superconducting transmission cables and fault current limiters.A modified TFA-MOD method was applied to prepare YBCO layer on Rolling Assisted Biaxially Textured Substrate(RABiTS)with textured Y 2 O 3/YSZ/CeO 2 buffer layers,resulting in reduced time and cost of fabrication.By using Cu naphthenate instead of Cu(TFA)2,the pyrolysis time of the YBCO precursors was reduced significantly.YBCO films with thickness of 2μm were fabricated with multiple-coating and annealed at high temperature for 2 h.X-ray diffraction analysis revealed that the films were c-axis oriented.The preliminary results of YBCO films yielded 0.2 MA/cm 2 at 77 K and self field.It is believed current carrying ability of YBCO films could be further improved by reducing the reaction rate at the interface between the buffer layer and superconducting layer.
文摘Superconducting YBa2Cu3O7-x films were grown on the CeO2/YSZ/Y2O3 buffered rolling assisted biaxial textured Ni-5at%W substrate by MOCVD method.Self-made Y(DPM)3,Ba(DPM)2,and Cu(DPM)2 were used as the precursors.Different ratios of the precursors were applied to optimize the hetero-epitaxial structure and property of YBCO films.X-ray diffraction revealed that YBCO films had excellent in plane texture with full width at half maximum(FWHM)value of(103)=5.6°-6.5°and out-of-plane texture with FWHM of(005)=3.1°-3.7°.The superconductivity of YBCO films was measured.The relationship between the ratios of the precursors and the property of the films were discussed in detail.
文摘CeO2 seed layer was deposited on rolling-assisted biaxially textured metal substrates by direct-current(DC)magnetron reactive sputtering.The effect of deposition temperature on epitaxial orientation of CeO2 thin films was examined.High quality CeO2 layers were achieved at deposition temperature from 750℃to 850℃.Subsequently yttria-stabilized zirconia(YSZ)and CeO2 films were deposited to complete the buffer layer structure via the same process.The best samples exhibited a highly biaxial texture,as indicated by FWHM(full width half maximum)values in the range of 4°-5°,and 2°-4°for in-plane and out-of-plane orientations,respectively.Secondary ion mass spectrometer analysis confirmed the effective prevention of buffer layer against Ni and W metal interdiffusion.Atomic force microscope observations revealed a smooth,dense and crack-free surface morphology,which provided themselves as the good buffer structure to the YBa2Cu3O7-δ(YBCO)coated conductors.
