实验表明,在烧制 Bi-Sr-Ca-Cu-O 超导体时,压片两面用银片覆盖后热处理有利于110K 超导相生成,制得的超导体有较高的零电阻温度。XPS 分析表明,在烧制超导材料时 Bi 能优先挥发,其次是 Ca。有银片覆盖可减轻 Bi 等成份的挥发程度,因此...实验表明,在烧制 Bi-Sr-Ca-Cu-O 超导体时,压片两面用银片覆盖后热处理有利于110K 超导相生成,制得的超导体有较高的零电阻温度。XPS 分析表明,在烧制超导材料时 Bi 能优先挥发,其次是 Ca。有银片覆盖可减轻 Bi 等成份的挥发程度,因此有银片覆盖的超导体中 Bi、Sr、Ca 和 O 的相对浓度比无银片覆盖的超导体中的要高。展开更多
The four-level model of laser-induced collisional energy transfer （LICET） for the ion-ion collision system is established based on the time-dependent SchrSdinger equation for the electron dynamics, through which the...The four-level model of laser-induced collisional energy transfer （LICET） for the ion-ion collision system is established based on the time-dependent SchrSdinger equation for the electron dynamics, through which the equations of motion of the probability amplitudes and cross section of the collision system are obtained. Numerical calculations are performed for the Ca＋ Sr＋ system, with the results showing that the peak of the LICET spectrum appears at a resonant frequency of the transfer laser. The magnitude of the obtained collision cross section is in the order of 10-16 cm2, and is comparable to that obtained in atomic systems, which indicates the validity of the established four-level model.展开更多
The Bi-Sr-Ca-Cu-O suterconducting ceramics with T_c(onset)=112K, T_c(R=0)=85.3 K were prepared by quenching process.The Meissner effect of the sample appears at about 84.0 K.
文摘实验表明,在烧制 Bi-Sr-Ca-Cu-O 超导体时,压片两面用银片覆盖后热处理有利于110K 超导相生成,制得的超导体有较高的零电阻温度。XPS 分析表明,在烧制超导材料时 Bi 能优先挥发,其次是 Ca。有银片覆盖可减轻 Bi 等成份的挥发程度,因此有银片覆盖的超导体中 Bi、Sr、Ca 和 O 的相对浓度比无银片覆盖的超导体中的要高。
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 10674036 and 10774033)Program of Excellent Team in Harbin Institute of Technology,China
文摘The four-level model of laser-induced collisional energy transfer （LICET） for the ion-ion collision system is established based on the time-dependent SchrSdinger equation for the electron dynamics, through which the equations of motion of the probability amplitudes and cross section of the collision system are obtained. Numerical calculations are performed for the Ca＋ Sr＋ system, with the results showing that the peak of the LICET spectrum appears at a resonant frequency of the transfer laser. The magnitude of the obtained collision cross section is in the order of 10-16 cm2, and is comparable to that obtained in atomic systems, which indicates the validity of the established four-level model.
文摘The Bi-Sr-Ca-Cu-O suterconducting ceramics with T_c(onset)=112K, T_c(R=0)=85.3 K were prepared by quenching process.The Meissner effect of the sample appears at about 84.0 K.
