Time Resolved Phase Transitions via Dynamic Transmission Electron Microscopy

Reed, B W ; Armstrong, M R ; Blobaum, K J ; Browning, N D ; Burnham, A K ; Campbell, G H ; Gee, R ; Kim, J S ; King, W E ; Maiti, A ; Piggott, W T ; Torralva, B R

关键词: BISMUTH;    ELECTRON DIFFRACTION;    ELECTRON MICROSCOPES;    KINETICS;    MELTING;    MOL;   

DOI  :  10.2172/902321
RP-ID  :  UCRL-TR-228336
PID  :  OSTI ID: 902321
Others  :  TRN: US0702925

美国|英语

来源: SciTech Connect

【 摘 要 】

The Dynamic Transmission Electron Microscope (DTEM) project is developing an in situ electron microscope with nanometer- and nanosecond-scale resolution for the study of rapid laser-driven processes in materials. We report on the results obtained in a year-long LDRD-supported effort to develop DTEM techniques and results for phase transitions in molecular crystals, reactive multilayer foils, and melting and resolidification of bismuth. We report the first in situ TEM observation of the HMX {beta}-{delta} phase transformation in sub-{micro}m crystals, computational results suggesting the importance of voids and free surfaces in the HMX transformation kinetics, and the first electron diffraction patterns of intermediate states in fast multilayer foil reactions. This project developed techniques which are applicable to many materials systems and will continue to be employed within the larger DTEM effort.