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首页> 外文期刊>Physica, C. Superconductivity and its applications >INFRARED REFLECTIVITY OF CERAMIC BI2SR2CACU2O8+DELTA AS A FUNCTION OF OXYGEN AND IODINE
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INFRARED REFLECTIVITY OF CERAMIC BI2SR2CACU2O8+DELTA AS A FUNCTION OF OXYGEN AND IODINE

机译：陶瓷BI2SR2CACU2O8 +δ的红外反射率与氧气和碘的关系

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摘要

The room-temperature IR reflectance between 50 and 800 cm(-1) of ceramic Bi2-xPbxSr2CaCu2O8+8 is reported for x = 0 and 0.2, varying oxygen stoichiometry and for stage 1 iodine intercalation. The observed softening of the cation modes with oxygen desorption is consistent with the observed increase in the c-axis cell parameter. In contrast the high-frequency mode at 590 cm(-1), which is ascribed to oxygen-atom motion, hardens with oxygen desorption. This shift is probably dominated by the direct effect of sorbed oxygen on the dynamics of the O(3) atom in the BiO sheets rather than by structural changes associated with charge transfer to the CuO planes. Iodine intercalation produces a large change in the IR reflectivity spectra with the disappearance of modes below about 300 cm(-1), the apparent merging of the modes at 300 and 350 cm(-1) into a broad mode near 315 cm(-1), and a reduction in the background reflectivity. It is concluded that the lattice disorder induced by iodine intercalation, observed by TEM, results in the low-frequency modes being broadened to the point where they are indistinguishable from the background reflectivity. [References: 31]
机译：据报道，对于x = 0和0.2，变化的氧气化学计量比和第1阶段碘插层，陶瓷Bi2-xPbxSr2CaCu2O8 + 8在50至800 cm（-1）之间的室温IR反射率。观察到的具有氧脱附的阳离子模式的软化与观察到的c轴池参数的增加一致。相反，归因于氧原子运动的590 cm（-1）的高频模式会随着氧气的解吸而变硬。这种移动可能是由吸附的氧对BiO片中O（3）原子的动力学的直接影响而不是与电荷转移到CuO平面相关的结构变化所决定的。碘的插入会在红外反射率光谱中产生较大的变化，而在300 cm（-1）以下的模式消失，在300和350 cm（-1）的模式明显合并到315 cm（-1）的宽模式），并降低背景反射率。结论是，通过TEM观察到的由碘嵌入引起的晶格紊乱导致低频模式变宽到与背景反射率无法区分的点。 [参考：31]

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