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首页> 外文期刊>Physica, C. Superconductivity and its applications >OXYGEN DEPENDENCE OF THE MECHANICAL SPECTRUM OF BI2SR2CACU2O8+X IN THE TEMPERATURE RANGE 80-600 K
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OXYGEN DEPENDENCE OF THE MECHANICAL SPECTRUM OF BI2SR2CACU2O8+X IN THE TEMPERATURE RANGE 80-600 K

机译：温度范围80-600 K中BI2SR2CACU2O8 + X的机械光谱的氧依赖性

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摘要

The elastic modulus and mechanical loss of ceramic Bi2Sr2CaCu2O8+x specimens have been measured between 80 K and 600 K in the kHz frequency range. The mechanical-loss spectrum is composed of two relaxation peaks located at similar to 145 K and similar to 450 K. The two peaks are certainly correlated with the oxygen content (x) because the peak heights depend on the thermal treatments, i.e. oxygen content. The 450 K peak can be associated with the diffusion of the additional oxygen atoms in the BiO layers. The 150 K peak may be due to the hopping of holes in the CuO2 layers. Finally, the elastic modulus shows a strong hysteresis between heating and cooling, which could result from an ''order-disorder'' transition of oxygen atoms in the BiO layers and from the stress induced in polycrystalline samples by the anisotropy of thermal expansion. [References: 26]
机译：在kHz频率范围内，在80 K至600 K之间测量了Bi2Sr2CaCu2O8 + x陶瓷样品的弹性模量和机械损耗。机械损失谱由位于类似于145 K和类似于450 K的两个弛豫峰组成。这两个峰当然与氧含量（x）相关，因为峰高取决于热处理，即氧含量。 450 K峰可能与BiO层中其他氧原子的扩散有关。 150 K峰值可能是由于CuO2层中的空穴跳动所致。最后，弹性模量在加热和冷却之间显示出很强的磁滞现象，这可能是由于BiO层中氧原子的“有序-无序”转变以及由于热膨胀各向异性而在多晶样品中引起的应力。 [参考：26]

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