In order to study how the Sn substitution for Tl changes the superconducting properties of the TlBaCaCuO compound,we have prepared samples with Sn in place of Tl by solid state reactions.Measurements of resistance and...In order to study how the Sn substitution for Tl changes the superconducting properties of the TlBaCaCuO compound,we have prepared samples with Sn in place of Tl by solid state reactions.Measurements of resistance and magnetic susceptibility show that partial substitution of Tl with Sn is helpful to form the superconducting 2223 phase(for T1:Ba:Ca:Cu).It has been found that samples mainly contain tetragonal phase 2223,but there also exist a few additional maxed phases like 1223,1234 and nonsuperconducting phase BaSnO_(3).展开更多
The A1 substitution in the T1-Ba-Ca-Cu-O superconducting system was studied.Up to 70%of Tl can be substituted by Al,without significant reduction of Tc.X-ray diffraction indicates partial A1 substitution does not alte...The A1 substitution in the T1-Ba-Ca-Cu-O superconducting system was studied.Up to 70%of Tl can be substituted by Al,without significant reduction of Tc.X-ray diffraction indicates partial A1 substitution does not alter the crystal structure of the 2223 phase.Excessive A1 formed Al-Cu alloy and unidentified phases,which gradually destroyed the superconductivity.展开更多
文摘In order to study how the Sn substitution for Tl changes the superconducting properties of the TlBaCaCuO compound,we have prepared samples with Sn in place of Tl by solid state reactions.Measurements of resistance and magnetic susceptibility show that partial substitution of Tl with Sn is helpful to form the superconducting 2223 phase(for T1:Ba:Ca:Cu).It has been found that samples mainly contain tetragonal phase 2223,but there also exist a few additional maxed phases like 1223,1234 and nonsuperconducting phase BaSnO_(3).
文摘The A1 substitution in the T1-Ba-Ca-Cu-O superconducting system was studied.Up to 70%of Tl can be substituted by Al,without significant reduction of Tc.X-ray diffraction indicates partial A1 substitution does not alter the crystal structure of the 2223 phase.Excessive A1 formed Al-Cu alloy and unidentified phases,which gradually destroyed the superconductivity.
