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Gray track formation in $KTiOPO_4$ by swift ion irradiation

Deepthy, A and Rao, KSRK and Bhat, HL and Kumar, Ravi and Asokan, K (2001) Gray track formation in $KTiOPO_4$ by swift ion irradiation. In: Journal of Applied Physics, 89 (11). pp. 6560-6562.


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Potassium titanyl phosphate single crystals were irradiated with 48 MeV lithium ions at fluences varying from $5X10^{12}$ to $10^{16}ions/cm^2$. The defects created in the crystal have been characterized using x-ray rocking curve measurements, optical transmittance, and photoluminescence spectroscopy. From x-ray rocking curve studies, the full width at half maximum for the irradiated samples was observed to increase, indicating lattice strain caused by the energetic ions. Optical transparency of these samples was found to decrease upon irradiation. The irradiated samples exhibited a broadband luminescence in the 700–900 nm region, for fluences above $5X10^{13}ions/cm^2$. The results indicate that ion-beam-induced optical effects in $KTiOPO_4$ single crystals are very similar to the ones obtained for crystals with ‘‘gray tracks,’’ which are attributed to the electronic transitions in the $Ti^{3+}$ levels.

Item Type: Journal Article
Publication: Journal of Applied Physics
Publisher: American Institute of Physics (AIP)
Additional Information: Copyright for this article belongs to American Institute of Physics (AIP).
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 08 Feb 2007
Last Modified: 19 Sep 2010 04:12
URI: http://eprints.iisc.ac.in/id/eprint/80

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