金属铈同素异构相变行为的DSC研究

DSC of Allotropic Transformations in Cerium

以快速冷却方法制备的细晶金属铈(Ce)为研究对象,采用DSC技术探索100~600 K温度范围内连续降温和升温过程中,Ce的同素异构相变行为。结果表明,Ce在从300~100 K范围内的连续降温过程中依次发生γ→β和γ→α相变,相变温度分别是280和128.5 K;从100~300 K温度范围内连续升温过程中同时发生α→β和α→γ相变,相变区间从124.3~199.5 K;进一步升高温度至518.4 K,发生异常的γ→β相变。

Allotropic transformation behaviors of cerium were studied by DSC technology in the process of continuous cooling and heating between 100 and 600 K. The fine-grained Ce sample was prepared by rapid cooling method. The results showed that in the process of continuous cooling from 300 to 100 K,there are two phase transformations happened respectively,γ→β and γ→α,at 280 and 128. 5 K,respectively. Upon continuous heating from100 to 300 K,α→β transformation occurs at 124. 3 K firstly and then α →γ transformation occurs at 173. 4 K,both ending at 199. 5 K. As the temperature was raised to 518. 4 K,an abnormal γ→β transformation appears.