Journal article
The Vacancy Formation Energy in Crystalline Adamantane Determined by Positron Annihilation Techniques
Nano-Microstructures in Materials, Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark1
Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2
Risø National Laboratory for Sustainable Energy, Technical University of Denmark3
The injection of positrons into crystalline adamantane results in the formation of positronium (Ps). At temperatures T> 400 K the mean lifetime of the long-lived ortho-positronium exhibits a sigmoidal increase with temperature characteristic of the trapping of this species in thermally created defects.
The variation is well described by the trapping model usually applied to the trapping of positrons in defects in metals. The formation energy of the defects which trap ortho-Ps is estimated at Efv = 70 ± 10 kJ mol-1 (0.73 ± 0.1 eV). This value is in good agreement with estimates of the formation energy of lattice vacancies in adamantane derived from self-diffusion studies.
Language: | English |
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Publisher: | Elsevier BV |
Year: | 1980 |
Pages: | 487-491 |
ISSN: | 18734448 and 00092614 |
Types: | Journal article |
DOI: | 10.1016/0009-2614(80)80110-2 |
ORCIDs: | Eldrup, Morten Mostgaard |