基于实验测定海绵Pd颗粒在278 K～323 K范围内吸放H2,D2的P-C-T曲线,结合文献给出的其它形态的Pd吸放氢结果进行系统比较分析,探讨了形态对钯-氢体系热力学性质的宏观影响和微观本质.在室温附近,氢的饱和固溶度与坪压随Pd的粒度减小而增加;Pd的形态或粒度对氢的饱和固溶度和吸氢坪压的影响程度则随温度升高而减小,而且坪压之间的差别在温度较高时不再明显甚至消失.吸氘坪压差别大,解吸坪压差别小.Pd-H体系中α→β的相变热焓、热熵(绝对值)随粒度减小而减小,单晶Pd相应热力学函数最小.海绵Pd颗粒中的压力迟滞效应最明显,材料本底缺陷密度决定不同形态Pd-H体系的压力迟滞效应的大小.
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