用高温熔融法在 Sb_(12)Ge_(28)Se_(60)玻璃中掺入 Fe 和 Cu。对 Cu_x(Sb_(12)Ge_(28)(Se_(60))_(100-x)系统玻璃,当 Cu 含量为5 at%时,电导率提高3.4个数量级,电导活化能下降0.23eV。分析表明,Cu 引入后与母体玻璃中的阴离子形成了正...用高温熔融法在 Sb_(12)Ge_(28)Se_(60)玻璃中掺入 Fe 和 Cu。对 Cu_x(Sb_(12)Ge_(28)(Se_(60))_(100-x)系统玻璃,当 Cu 含量为5 at%时,电导率提高3.4个数量级,电导活化能下降0.23eV。分析表明,Cu 引入后与母体玻璃中的阴离子形成了正常结构键合的共价键,各元素的价键均得到满足,电导活化能的下降是由于禁带宽度降低导致(E_f-E_v)值下降所致。对 Fe_x(Sb_(12)Ge_(28)Se_(60))_(100-x)系统玻璃,DSC 与 SEM 的测定表明,Fe 引入后玻璃产生了分相。当 Fe 含量为2 at%时,电导率增加了6.3个数量级,电导活化能则下降0.61eV,光声子谱的分析表明,E_(opt)仅下降了0.04eV。根据这些数据和 ESR 的测定结果得出了该系统玻璃的能带结构模型,导致电导率激增的原因是由于 Fe^(2+)(d^(?))施主缺陷态的形成。展开更多
The change trends of the glass structure of the three component system AsGe-Te were studied by the method EXAFS, based on the phase diagram works of this system. That provides scientific basis for the preparation and ...The change trends of the glass structure of the three component system AsGe-Te were studied by the method EXAFS, based on the phase diagram works of this system. That provides scientific basis for the preparation and the application of the above-mentioned system.展开更多
文摘The change trends of the glass structure of the three component system AsGe-Te were studied by the method EXAFS, based on the phase diagram works of this system. That provides scientific basis for the preparation and the application of the above-mentioned system.
