Abstract
The microstructure of bronze mirror fabricated in the Korai period (10~14th centuries) has been investigated. Transmission electron microscope, X-ray diffraction, scanning electron microscope, electron dispersive X-ray analyses are used to determine the structures of the specimen. The composition of the specimen is Cu-15.2 mass%Pb-9.3 mass%Sn-0.5 mass%S, and Fe and As are detected as trace elements. The optical microstructure of the mirror consists of αCu, Cu41Sn11 (δphase), Pb and a phase containing Cu and S. The phase containing S has never been observed in Japanese mirrors or Chinese mirrors. This phase agrees with Cu2S listed in JCPDS No. 33-0490. Most of the Cu2S grains exist around Pb grains. The PbS nano crystal containing Cu phase that does not correspond to any known compound is observed between the Pb and the Cu2S grains. It is thought that Cu2S is an intermediate product matter in the refinement of copper ore, chalcopyrite (CuFeS2).
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