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  1. 2 Acta Physica Polonica A

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  1. 2 2014

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  1. 2 Balcerzak M.

  2. 2 Jurczyk M.

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Electrochemical and Corrosion Behavior of Nanocrystalline TiNi-Based Alloys and Composite

100%
Balcerzak M., Jurczyk M.
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vol. 126
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issue 4
888-891
EN
In this work TiNi-based nanocrystalline alloys and composite were produced by mechanical alloying process with subsequent annealing at 750°C for 0.5 h. Mechanical alloying was performed in a SPEX 8000 Mixer Mill. TiNi alloy was chemically modified by Ag elemental powder. Silver content equaled 5 wt%. X-ray diffraction analyses revealed formation of TiNi main phase after annealing. Additionally, two minor phases Ti_2Ni and TiNi_3 were detected for unmodified alloy. Crystallites of obtained powders were nanosized. Corrosion and electrochemical measurements were performed in 6 M KOH solution. All synthesized materials were used as negative electrode for Ni-MH_x batteries. Ag addition positively affects on stability of discharge capacity of TiNi alloy during of charge/discharge tests.
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The Influence of Chemical Modification by Silver on Hydrogen Storage Properties of Nanocrystalline Ti_2Ni Alloy

100%
Balcerzak M., Jurczyk M.
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vol. 126
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issue 4
892-894
EN
In this study mechanical alloying process with subsequent annealing at 750°C for 0.5 h were used to produce Ti_2Ni-based nanocrystalline alloys and composite. To improve electrochemical properties, Ti-Ni-based alloy was chemically modified by 5 wt% of silver powder. X-ray diffraction analyses showed formation of nanocrystalline Ti_2Ni main phase. Electrochemical studies revealed a positive effect of chemical modification by silver on Ti_2Ni alloy. All synthesized materials were used as negative electrodes for Ni-MH_x batteries. The highest discharge capacity equaled 303 mAh/g, at 40 mA/g discharge current. All electrochemical measurements were done in 6 M KOH solution.
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