Polymerization and Damage of C60 Single Crystals under Low Fluency Laser Irradiation

Autor:	I. Manika, Donats Erts, Janis Maniks, R. Pokulis, J. Kalnacs
Rok vydání:	2001
Předmět:	Materials science Condensed Matter Physics Laser Indentation hardness Electronic Optical and Magnetic Materials law.invention Crystallography Polymerization law Hardening (metallurgy) Substructure Irradiation Composite material Dislocation Power density
Zdroj:	physica status solidi (a). 188:989-998
ISSN:	1521-396X 0031-8965
DOI:	10.1002/1521-396x(200112)188:3<989::aid-pssa989>3.0.co;2-#
Popis:	Photo-induced hardening, substructure formation and damage of C 60 single crystals under the 632.8 nm He-Ne laser irradiation in air at a power density of 1.47 mW/mm 2 was investigated by microhardness and AFM methods. Photo-induced formation of the dislocation substructure and crystallographically oriented crack patterns on the (111) face due to lattice contraction on polymerization were observed. Two phototransformed states: soft (400-450 MPa) and hard (650-1000 MPa) are found to appear under laser-irradiation. Hard fullerite is created in the subsurface layer < 1 μm at the saturation stage of phototransformation. It softens to 400-450 MPa at 340 K and reverts to non-polymerized state at 470-480 K. The effect of post-irradiation hardening, which appears as an increase of the hardness of laser-irradiated crystals after storage in air in the dark, has been discovered.
Databáze:	OpenAIRE
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