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Title: Time Resolved Phase Transitions via Dynamic Transmission Electron Microscopy

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.
Authors:
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Publication Date:
OSTI Identifier:
902321
Report Number(s):
UCRL-TR-228336
TRN: US0702925
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Technical Report
Research Org:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; BISMUTH; ELECTRON DIFFRACTION; ELECTRON MICROSCOPES; KINETICS; MELTING; MOLECULAR CRYSTALS; PHASE TRANSFORMATIONS; RESOLUTION; TRANSFORMATIONS; TRANSMISSION ELECTRON MICROSCOPY