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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Reversible hydrogen absorption and desorption achieved by irreversible phase transition
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Reversible hydrogen absorption and desorption achieved by irreversible phase transition

机译：通过不可逆的相变实现可逆的氢吸收和解吸

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摘要

Phase relations in the Zr_7Ni_(10)-H system were examined with a conventional Sieverts'-type apparatus. The hydrogen pressure-composition-temperature (PCT) relations obtained under the conditions such as a temperature of 410 K and a pressure range of 0.01-3 MPa demonstrated the existence of two hydride phases (#beta#, #gamma#) in the system and indicated the following unprecedented hydrogenation behavior of the Zr_7Ni_(10) corn pound: (1) the #beta#-hydride phase, which has lower hydrogen content than the other (#gamma#), appears only in hydrogen desorption but not in hydrogen absorption; (2) the hydrogen capacity of the continuous solid solution phase (#alpha#) is 0.56H/M (HIM; the atomic ratio of hydrogen to metal) in hydrogen absorption and only 0.40H/M in hydrogen desorption; (3) The Zr_7Ni_(10) compound absorbs hydrogen accompanied by the phase transition from a to #gamma#(#alpha#->#gamma# transition) and desorbs hydrogen accompanied by the #gamma#->#beta# and #beta#->#alpha# transitions, however, the reverse of these three transitions, i.e. #gamma#->#alpha#, #beta#->#gamma# and #alpha#->#beta# transitions are not observed in the PCT relations under the conditions mentioned above. From the fact about the irreversibility of the phase transitions, the Zr_7Ni_(10) compound can reversibly absorb and desorb hydrogen by the irreversible phase transition.
机译：Zr_7Ni_（10）-H系统中的相位关系用常规的Sieverts型设备检查。在温度为410 K，压力范围为0.01-3 MPa的条件下获得的氢压力-组成-温度（PCT）关系表明系统中存在两个氢化物相（＃beta＃，＃gamma＃）并表明Zr_7Ni_（10）玉米磅具有以下前所未有的氢化行为：（1）＃beta＃-氢化物相的氢含量比另一种（＃gamma＃）低，仅在氢解吸中出现，而在氢中不出现吸收（2）连续固溶相（＃α＃）的氢容量在氢吸收中为0.56H / M（HIM;氢与金属的原子比），在氢脱附中仅为0.40H / M; （3）Zr_7Ni_（10）化合物吸收氢并伴随从a到#gamma＃（＃alpha＃->＃gamma＃过渡）的相变，并解吸氢并伴随#gamma＃->＃beta＃和#beta ＃->＃alpha＃转换，但是，这三个转换的反向，即#gamma＃->＃alpha＃，＃beta＃->＃gamma＃和#alpha＃->＃beta＃转换在在上述条件下的PCT关系。从相变的不可逆性这一事实来看，Zr_7Ni_（10）化合物可以通过不可逆的相变可逆地吸收和解吸氢。

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