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C. FLOREA1,* , S. GEORGESCU2
During the irradiation of fluorite (CaF2) with photons (X) we observe the formation of nano ordered structures (inclusions). They are homothetic in to the fluorine ions of the crystal. Particles of approximately 10 nm size agglomerate and form nanostructures of parallelipipedic shape. The length of these structures is situated in the range 30-3000 nm. They are similar to Veselago - Pendry structures that exhibit a negative permittivity [1 - 2] and are important in the field of the metamaterials. The local changes of symmetry produced by the formation of the nano structures can be inferred from EPR measurements on Kramers rare earth ions introduced in CaF2.
Nanostructures with parallelipipedic shape, Kramers rare earth ions, F centers, Local symmetry change, Exciton.
C. FLOREA, S. GEORGESCU, Nano-structures induced by photonic irradiation – an EPR study, Optoelectronics and Advanced Materials - Rapid Communications, 1, 5, May 2007, pp.212-216 (2007).
Submitted at: Feb. 12, 2007
Accepted at: April 5, 2007
Optoelectronics and Advanced Materials - Rapid Communications
(2024): Impact Factor = 0.4 - Journal Citation Reports (Clarivate Analytics, 2025)
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