Pressure-induced phase transition in pentacene
| Autor: | R. G. Della Valle, K. Syassen, M. Amboage, Luca Farina, Elisabetta Venuti, Aldo Brillante |
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| Rok vydání: | 2003 |
| Předmět: |
Diffraction
Lattice dynamics Phase transition Condensed matter physics Chemistry Phonon General Physics and Astronomy macromolecular substances Molecular physics Pentacene symbols.namesake chemistry.chemical_compound Lattice (order) symbols Solid phases Physical and Theoretical Chemistry Raman spectroscopy |
| Zdroj: | Chemical Physics Letters. 375:490-494 |
| ISSN: | 0009-2614 |
| Popis: | We have recently studied two solid phases of bulk pentacene (polymorphs H and C) by means of lattice phonon Raman spectroscopy. The assignment, previously based on lattice dynamics calculations alone, is now verified by X-ray diffraction measurements, conclusively confirming the existence of both polymorphs. Furthermore, Raman phonon spectra indicate a pressure-induced phase transition where the polymorph C (lower density phase) transforms to the H form (higher density phase). The onset pressure for the phase transition is only 0.2 GPa. The phase change is irreversible. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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