二氧化钚纳米晶体晶粒生长的动力学研究。

Bouëxière Daniel, Popa Karin, Walter Olaf, Cologna Marco

European Commission, DG Joint Research Centre, JRC-Karlsruhe P. O. Box 2340 76125 Karlsruhe Germany

RSC Adv. 2019 Feb 25;9(12):6542-6547. doi: 10.1039/c8ra10430a. eCollection 2019 Feb 22.

Kinetic measurements on the grain growth of PuO nano-crystals are presented. On the basis of isothermal XRD measurements at temperatures of 820 °C, 900 °C, 1000 °C, and 1100 °C the activation energy for the crystallite growth of PuO nanopowder is determined as 351(5) kJ mol in the temperature range from 820 to 1000 °C. Modelling shows that in this range growth happens likely through surface diffusion.

本文给出了对PuO纳米晶体晶粒生长的动力学测量结果。基于在820℃、900℃、1000℃和1100℃温度下的等温XRD测量，确定了PuO纳米粉末微晶生长在820至1000℃温度范围内的活化能为351(5)kJ/mol。模型表明，在此温度范围内，生长可能通过表面扩散发生。