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Spark plasma sintered transition metal diborides such as HfB2, ZrB2 and their solid solutions were investigated as electrode materials for electrochemical hydrogen evolutions reactions (HER) in 1M H2SO4 and 1M NaOH electrolytes. HfB2 and ZrB2 formed complete solid solutions when mixed in 1:1, 1:4, and 4:1 ratios and they were stable in both electrolytes. The HER kinetics of the diborides were slower...
Ba0.4Sr0.6TiO3 ceramics were prepared by hydrothermal method and microwave sintering at relatively low temperature (1190°C) for various sintering time. All samples were well crystallized with a pure perovskite structure without any secondary phases. When sintering for 1min, ceramics showed the smallest average grain size, and then increased with further sintering process. The smaller grain size of...
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