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Zr-V-Mn-Ni계 라브스상 합금의 미세 구조와 전기 화학적 특성
정치규(Chi Gyu Jeong),한동수(Dong Soo Han),정원섭(Won Sub Chung),김인곤(In Gon Kim),김원백(Won Baek Kim) 한국수소및신에너지학회 1997 한국수소 및 신에너지학회논문집 Vol.8 No.3
ZrV<sub>0.1</sub>Mn<sub>0.7</sub>Ni<sub>1.2</sub> alloy ingot (bulk alloy) made by the arc melting was found to be consisting of mostly of ZrV<sub>0.2</sub>Mn<sub>0.98</sub>Ni<sub>1.04</sub> matrix alloy and ZrV<sub>0.01</sub>Mn<sub>0.13</sub>Ni<sub>1.2</sub> 2nd phase alloy. The former alloy had the form of the C15 type Laves alloy structure and the latter one had the intermetallic compound structure of Zr<sub>9</sub>sNi<sub>11</sub>. In order to investigate the effect of these two phases on the electrochemical charge-discharge characteristics of bulk ZrV<sub>0.1</sub>Mn<sub>0.7</sub>Ni<sub>1.2</sub> alloy, the matrix and the 2nd phase alloys were fabricated separately by arc melting method and their electrochemical characteristics were studied and compared with the bulk alloy. It was found that the discharge capacity was the lowest of 160 mAh/g in the 2nd phase alloy. The matrix alloy exhibited 200 mAh/g. Both were lower than that of the bulk alloy of 250 mAh/g. The matrix and the bulk alloys showed a similar properties in the activation stage, the high rate dischargeability and the self discharge characteristics. Also a signigicant capacity decrease was observed after activation in both alloys. Whereas the 2nd phase alloy showed the very different characteristics. This alloy was found to be difficult to activate. However the capacity was remained constant after the activation. Also the self discharge rate was seen to be better than those of the matrix and the bulk alloys.
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