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《International Journal of Hydrogen Energy》2019,44(36):20145-20149
The pressure-composition absorption isotherms of deuterium in an alloy with nominal composition V85Ni15 were measured between 87 and 400 °C for pressures up to ≈17 bar. For T ≤ 144 °C one observes the occurrence of a solid solution α phase for D/M < 0.15, the coexistence of α and β phase up to D/M ≈ 0.5 and a subsequent change to a different phase for higher deuterium concentrations. For temperatures higher than 200 °C only a solid solution with a deuteration enthalpy ΔHdeutr = 47 ± 2 kJ/mol is detected. The critical temperature of this V-Ni alloy (144 °C ≤ T*≤200 °C) is much higher than that of pure V (100 °C). Moreover, well above the critical temperature, one can observe a “normal” isotope effect, i.e. the equilibrium pressure of the V85Ni15-H system is higher than that of V85Ni15-D. 相似文献
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采用压力-体积-温度系统(PVT)与热台显微镜(Hot-stage microscope,HSM)相结合的方法,研究了铈(Ce)在过量氘(D2)气氛下的腐蚀行为;采用X射线衍射(XRD)仪和热脱附谱(TDS)方法分别考察了铈-氖反应产物的相组成及热稳定性。结果表明,铈在室温、初始压力43 kPa的氘气氛下,可快速与氘发生反应,形成饱和的铈氘化物CeD3,样品发生严重粉化;对饱和铈氘化物在不同温度下加热,可得到一系列不同氘含量的铈氘化物;所制备的铈氘化物在室温下均具有与金属铈类似的面心立方(fcc)结构,铈形成CeD_2的体胀约为24.3%,但随着氘含量的增加,铈氘化物会发生反常的体积收缩现象;热脱附谱测试表明CeD_3在120℃附近即可发生分解,而CeD_2则可稳定至600℃以上。 相似文献
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