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对合金贮氢材料PdAg(银原子数27%)在40℃～-115℃范围内进行相图的实验研究,发现在温度降低时其面心立方晶体结构转化为四方结构,与某些合金相类似,存在着固一固相变.新相开始生成的温度在降温过程中是-20℃.在升温时,新相消失的温度高于这个温度.实验测定了新相的生长与温度变化的关系曲线。用分析X光衍射结果的外推法确定了在不同温度下钯银合全面心立方相晶体的晶格常数,并确定了其晶格常数的温度系数.α= +5.86×10~(-5)A/度。
The phase diagram of the alloy hydrogen storage material PdAg (27% of the number of silver atoms) was carried out in the temperature range of 40 ℃ ~ -115 ℃. It was found that the face-centered cubic crystal structure was transformed into tetragonal structure when the temperature was decreased, Similarly, there is solid-solid phase transformation.The temperature at which the new phase starts to form is -20 ° C. During the temperature rise, the temperature at which the new phase disappears is higher than this temperature.The growth of the new phase and the temperature change Relationship lines. The lattice constants of the Pd-Ag coplanar core-like cubic crystals at different temperatures were determined by the extrapolation of X-ray diffraction results and the temperature coefficients of their lattice constants were determined. Α = + 5.86 × 10 -5 ) A / degrees.