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Title
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Revealing the ions localization at low symmetry Bi sites in photorefractive crystals doped with Cu and V by high frequency EPR
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Author
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Abstract
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| The sites of incorporation of Cu2+ impurity ions in Bi12GeO20 single crystals co-doped with copper and vanadium have been investigated by electron paramagnetic resonance (EPR). While the X-band EPR spectra consist of a simple broad (Delta B similar to 50 mT) line with anisotropic lineshape, the W-band EPR spectra exhibit well resolved, strongly anisotropic lines, due to transitions within the 3d(9)-D-2 ground manifold of the Cu2+ ions. The most intense group of lines, attributed to the dominant Cu2+(I) center, displays a characteristic four components hyperfine structure for magnetic field orientations close to a < 110 > direction. The g and A tensor main axes are very close to one of the 12 possible sets of orthogonal < 1-10 >, < 00-1 > and < 110 > crystal directions. Several less intense lines, with unresolved hyperfine structure and similar symmetry properties, mostly overlapped by the Cu2+(I) spectrum, were attributed to Cu-2 (+)(II) centers. The two paramagnetic centers are identified as substitutional Cu2+ ions at Bi3+ sites with low C-1 symmetry, very likely resulting from different configurations of neighboring charge compensating defects. (C) 2015 Elsevier Inc. All rights reserved. |
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Language
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English
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Source (journal)
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Journal of magnetic resonance. - New York, N.Y.
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Publication
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New York, N.Y.
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2015
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ISSN
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1090-7807
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DOI
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10.1016/J.JMR.2015.07.009
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Volume/pages
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259
(2015)
, p. 87-94
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ISI
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000363358800011
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Pubmed ID
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26302270
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Full text (Publisher's DOI)
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Full text (open access)
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Full text (publisher's version - intranet only)
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