Large area YBCO superconductive films prepared by d.c. magnetron sputtering have reached: T c>89 K, J c>3.5×10 6 A/cm 2 (77 K, 0 T), R s=0.25 mΩ, at 77.5 K, 9894 MHz. The microstructure an...Large area YBCO superconductive films prepared by d.c. magnetron sputtering have reached: T c>89 K, J c>3.5×10 6 A/cm 2 (77 K, 0 T), R s=0.25 mΩ, at 77.5 K, 9894 MHz. The microstructure analysis of the film showed it has fine monocrystalline structure and the crystalline perfectness is satisfactory. The oscillator, filter and antenna made from these films are good in performance. Therefore, YBCO superconductive films have great prospect in application.展开更多
The growth character and microstructure of high-T_c supereonducting YBCO thin films deposited on vari- ous substrates have been studied by X-ray diffraction, TEM and SEM.The results show that when the substrate temper...The growth character and microstructure of high-T_c supereonducting YBCO thin films deposited on vari- ous substrates have been studied by X-ray diffraction, TEM and SEM.The results show that when the substrate temperaturc is around 700～800℃ the films have a highly oriented texture with c-axis pependicular to the substrate. The structure of the single crystalline YBCO films grown epitaxially at optimal substrate tem- perature of 800℃ has been established by X-ray diffraction using Seemann-Bohlin geometry (SB). Brentano-Bragg geometry(BB),transmission Laue method and TEM. The lattice matching required for epitaxial growth is achievcd by azimuthal adjustment of the film plane with respect to the substrate plane. The sperior growth is demonstrated by film properties such as critical current density(2.4×10~6 A /cm^2,3.4× 10~6 A/cm^2 and 4.7×l0~6 A/cm^2) for films deposited on YSZ[(Zr(Y)O_2],SrTiO_3 and LaAIO_3 respectively at 77 K and zero fie1d.展开更多
Y_(1-x)Ho_xBa_2Cu_3O_(7-δ)(0<x<1) sinsle crystal thin films oriented with the caxis perpendicular to the sur-face were grown by DC magnetron sputtering technique. Target was pieced together with half of YBa_2Cu...Y_(1-x)Ho_xBa_2Cu_3O_(7-δ)(0<x<1) sinsle crystal thin films oriented with the caxis perpendicular to the sur-face were grown by DC magnetron sputtering technique. Target was pieced together with half of YBa_2Cu_3O_(7-δ)(YBCO) and half of HoBa_2Cu_3O_(7-δ)(HBCO) superconducting materials. As the distance between HBCO targetmaterial and substrate is varied , the Ho content in material is changed respectively. When the content of Ho is0. 7 (atom ratio) , the T_c>83K.展开更多
Large area YBCO superconducting thin films were grown on the Zr(Y)O2 substrate at 750 and 800℃ respectively by magnetron sputtering, and the surface morphology was studied with AEM. STM and SEM with an EDS and ECP at...Large area YBCO superconducting thin films were grown on the Zr(Y)O2 substrate at 750 and 800℃ respectively by magnetron sputtering, and the surface morphology was studied with AEM. STM and SEM with an EDS and ECP attachments. The YBCO thin film was found to be a caxis orientated single crystal. At 800℃, the surface out-growths of the thin film Were mainly CuO particles and many small holes were found on the surface. which resulted in rougher surface; whereas, at 750℃, the out-growths were mainly the 123 structure in the form of rod-like and polygon and the surface was much smoother because of less small holes on the surface. The mechanism of the thin film growth and the formation of the small holes on the surface grown at the two temperature were discussed.展开更多
Yttria-stabilized zirconia (YSZ) thin films with the c-axis texturing were successfully deposited onpolycrystalline metallic tape (Hastelloy-C) by a dc bias rf magnetron sputtering. X-ray measurements re-vealed that t...Yttria-stabilized zirconia (YSZ) thin films with the c-axis texturing were successfully deposited onpolycrystalline metallic tape (Hastelloy-C) by a dc bias rf magnetron sputtering. X-ray measurements re-vealed that the resulting YSZ films exhibited pure c-axis texturing. YBCO films deposited by using demaguetron sputtering on Hastelloy tape with YSZ buffer layer were c-axis oriented with △ω(FWHM of apeak in the rocking curve) = 5. 9° . T_c_o of 91 K and J_c of 2. 0 × 10￣3 A/cm￣2(77 K, OT) were obtained.展开更多
文摘Large area YBCO superconductive films prepared by d.c. magnetron sputtering have reached: T c>89 K, J c>3.5×10 6 A/cm 2 (77 K, 0 T), R s=0.25 mΩ, at 77.5 K, 9894 MHz. The microstructure analysis of the film showed it has fine monocrystalline structure and the crystalline perfectness is satisfactory. The oscillator, filter and antenna made from these films are good in performance. Therefore, YBCO superconductive films have great prospect in application.
文摘The growth character and microstructure of high-T_c supereonducting YBCO thin films deposited on vari- ous substrates have been studied by X-ray diffraction, TEM and SEM.The results show that when the substrate temperaturc is around 700～800℃ the films have a highly oriented texture with c-axis pependicular to the substrate. The structure of the single crystalline YBCO films grown epitaxially at optimal substrate tem- perature of 800℃ has been established by X-ray diffraction using Seemann-Bohlin geometry (SB). Brentano-Bragg geometry(BB),transmission Laue method and TEM. The lattice matching required for epitaxial growth is achievcd by azimuthal adjustment of the film plane with respect to the substrate plane. The sperior growth is demonstrated by film properties such as critical current density(2.4×10~6 A /cm^2,3.4× 10~6 A/cm^2 and 4.7×l0~6 A/cm^2) for films deposited on YSZ[(Zr(Y)O_2],SrTiO_3 and LaAIO_3 respectively at 77 K and zero fie1d.
文摘Y_(1-x)Ho_xBa_2Cu_3O_(7-δ)(0<x<1) sinsle crystal thin films oriented with the caxis perpendicular to the sur-face were grown by DC magnetron sputtering technique. Target was pieced together with half of YBa_2Cu_3O_(7-δ)(YBCO) and half of HoBa_2Cu_3O_(7-δ)(HBCO) superconducting materials. As the distance between HBCO targetmaterial and substrate is varied , the Ho content in material is changed respectively. When the content of Ho is0. 7 (atom ratio) , the T_c>83K.
文摘Large area YBCO superconducting thin films were grown on the Zr(Y)O2 substrate at 750 and 800℃ respectively by magnetron sputtering, and the surface morphology was studied with AEM. STM and SEM with an EDS and ECP attachments. The YBCO thin film was found to be a caxis orientated single crystal. At 800℃, the surface out-growths of the thin film Were mainly CuO particles and many small holes were found on the surface. which resulted in rougher surface; whereas, at 750℃, the out-growths were mainly the 123 structure in the form of rod-like and polygon and the surface was much smoother because of less small holes on the surface. The mechanism of the thin film growth and the formation of the small holes on the surface grown at the two temperature were discussed.
文摘Yttria-stabilized zirconia (YSZ) thin films with the c-axis texturing were successfully deposited onpolycrystalline metallic tape (Hastelloy-C) by a dc bias rf magnetron sputtering. X-ray measurements re-vealed that the resulting YSZ films exhibited pure c-axis texturing. YBCO films deposited by using demaguetron sputtering on Hastelloy tape with YSZ buffer layer were c-axis oriented with △ω(FWHM of apeak in the rocking curve) = 5. 9° . T_c_o of 91 K and J_c of 2. 0 × 10￣3 A/cm￣2(77 K, OT) were obtained.
