通过计算和X衍射物相分析方法讨论了金属镧中氢的存在形式,实验和计算证实微量的氢在镧中不是以镧固溶体中溶质存在,而是以氢化镧的形式存在。由于氢化镧的晶体结构为面心立方,不同于镧在室温下的晶体结构密排六方,用X衍射物相分析方法可定性地分析镧中氢化镧的含量,从而定性地确定镧中氢的含量。 The existence of hydrogen in lanthanum metal was discussed by means of calculation and X-ray diffraction. The experiment and calculation proved that the trace amount of hydrogen exists in lanthanum not as solute in lanthanum solid solution but as lanthanum hydride. Since the crystal structure of lanthanum hydride is face-centered cubic, which is different from the hexagonal crystal structure of lanthanum at room temperature, the content of lanthanum hydride in lanthanum can be qualitatively analyzed by X-ray diffraction phase analysis method to qualitatively determine the content of hydrogen content.