By using Cu single crystals with the surfaces oriented in (100), (110), and (111) directions as substrate, the cathode polarization potential was measured in electrodeposition of Cu from acid Cu sulfate bath, and the formation of Cu electrodeposits was analyzed by microscopic and electron diffraction method.
It was found at higher current density that the polarization potentials of single crystal substrate were arranged in the order of (111)>(100)>(110) and each difference of polarizations between the orientations became less by the addition of thiourea.
It was confirmed that the formation of crystal growth from acid Cu sulfate bath was in step and pyramidal form at c.d. of 1 and 10mA/cm
2 on (100) plane and the pyramidal form became smaller at 10mA/cm
2; and in ridge form at 1 and 10mA/cm
2 on (110) plane. However, crystals were found in triangular or hexagonal layer at 1mA/cm
2 and in nodistinct form at 10mA/cm
2 on (111) plane.
Formation of octahedral twin crystals was observed at 10mA/cm
2 on (111) plane.
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