本大利用双温X射线衍射法测算了不同粒径纳米银颗粒的Debye温度发现多数样品的Debye温度高于大块银晶体的特征值，且存在一个临界尺寸当粒径小于临界值时，Debye温度随粒径变小而降低，当样品的粒径大于临界值时，其Debye温度低于临界尺寸所对应的特征值纳米银颗粒的Debye温度和粒径的关系为四，这一关系式较好地解释了实验结果 In this paper, the Debye temperature of nano-sized silver particles with different particle sizes was calculated by the two-temperature X-ray diffraction method. It was found that the Debye temperature of most samples is higher than the eigenvalue of the bulk silver crystal and there is a critical size. When the particle size is smaller than the critical value, Debye When the particle size of the sample is larger than the critical value, the relationship between the Debye temperature and the particle size of the characteristic value nano-silver particles whose Debye temperature is lower than the critical size is four, Good explanation of the experimental results