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A self-synthetized gold salt with water-solubility is employed as the main salt in electroplating gold bath.The gold coating presents an obvious preferred (111) orientation detected by XRD, and the intensity of (200) peak is slightly stronger than that of (220) peak.The surface energy, atomic geometry and electronic structures of Au(111), (200) and (220) faces were calculated based on the first-principle within generalized gradient approximation.According to the calculation of surface energy, the structural stability of Au surfaces, which decreases in the following order: Au(111)
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