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“黑漆古”铜镜的表面由非金属层和过渡层组成,价电子结构分析指出,非金属层主要成分Sn_(1-x)Cu_xO_2具有与SnO_2相近的稳定性,而实验数据分析发现,过渡层中,δ相铜锡合金与Sn_(1-x)Cu_xO_2的相界上存在着重合位置点阵(CSL)结构,这种结构降低了相界面上铜原子的能量,使这部分δ相晶粒也十分稳定,从而使整个“黑漆古”表面具有耐腐蚀性能。
The surface of “black lacquer ancient” bronze mirror is composed of non-metallic layer and transition layer. The analysis of valence electron structure indicates that Sn_ (1-x) Cu_xO_2, the main component of non-metallic layer, has similar stability to SnO_2. In the transitional layer, there exists a coincident position lattice (CSL) structure on the phase boundary between δ-phase Cu-Sn alloy and Sn_ (1-x) Cu_xO_2. This structure reduces the energy of copper atoms on the phase interface, Grain is also very stable, so that the entire “black lacquer ancient” surface with corrosion resistance.