The site and local environment of Fe<sup>3+</sup>in LiNbO<sub>3</sub>investigated with ENDOR

Söthe, H.; Spaeth, J.‐M.

doi:10.1088/0953-8984/4/49/017

Cited by 32 publications

(27 citation statements)

References 9 publications

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“…The analysis of the ENDOR spectra indicated that Fe3+ ions were at the Li+ sites in a nearly stoichiometric LiNbO, crystal [15]. The observed temperature variation [ l l ] of the ZFS parameter b: indicates that the Fe3+ ion moves towards the centre of the oxygen octahedron as the Nb5+ ion does.…”

Section: Discussionmentioning

confidence: 99%

Experimental and Theoretical Investigation of Spin‐Hamiltonian Parameters for the Low Symmetry Fe³⁺ Centre in LiNbO₃

Yeom

Chang

Choh

et al. 1994

Physica Status Solidi (b)

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. R u~o w~c z~) (a) X-band EPR spectra of Fe3+ in LiNbO, single crystals at room temperature are analyzed with a spin-Hamiltonian of C, symmetry. First the zero-field splitting (ZFS) parameters b:, bt, b:, and b4 are calculated using the superposition model (SPM). The SPM-ZFS results for Fe3+ at the Nb site agree better with the experimental ones than those for Fe3+ at the Li site. Next the crystal field (CF) parameters are predicted using SPM and two sets of available structural data for LiNbO,. Diagonalization of the full Hamiltonian, including the C F Hamiltonian, within the whole 3d5 configuration yields the ZF splittings for Fe3 + centres. The Z F splittings obtained from the theoretical SPM-CF calculations for Fe3+ at the Nb site agree better with the experimental EPR data than those for Fe3+ at the Li site. The present results indicate that the observed EPR spectra of Fe3+ : LiNbO, can be attributed to Fe3+ ions at the Nb sites.

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Section: Discussionmentioning

confidence: 99%

Experimental and Theoretical Investigation of Spin‐Hamiltonian Parameters for the Low Symmetry Fe³⁺ Centre in LiNbO₃

Yeom

Chang

Choh

et al. 1994

Physica Status Solidi (b)

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“…Experimental results are illustrated in Figure 4.2. ENDOR [34] and X-ray experiments [35] clearly indicate that the Fe centers occupy Li sites.…”

Section: Extrinsic Centersmentioning

confidence: 96%

Photorefractive Effects in LiNbO3 and LiTaO3

Buse

Imbrock

Krätzig

et al.

Photorefractive Materials and Their Applications 2

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Lithium niobate (LiNbO 3 ) and lithium tantalate (LiTaO 3 ) crystals have gained increasing interest during recent years because of their fascinating physical properties, such as piezoelectricity, ferroelectricity, pyroelectricity, birefringence, electrooptical, and nonlinear-optic effects. These properties have been successfully utilized for applications in various fields. Basic experiments on acoustic surface wave propagation, electrooptical modulation, optical wave guiding, second harmonic generation, and pyroelectric detection have been performed with these crystals.LiNbO 3 and its isomorphous compound LiTaO 3 are not found in nature. The first successful growth of large single crystals by the Czochralski technique was reported by Ballman [1]. A peculiarity results from the fact that the congruently melting composition (about 48.4 mol % Li 2 O) does not coincide with the stoichiometric one (50 mol % Li 2 O). The crystals have a perovskite-like structure with oxygen octahedra and are trigonal with only one structural phase transition (paraelectric-ferroelectric) at the Curie temperature T c of about 1150 • C for LiNbO 3 and about 610 • C for LiTaO 3 . The nonpolar high-temperature phase belongs to the space group R3c (point group 3m) and at T c the transition to the ferroelectric low-temperature phase of the space group R3c (point group 3m) occurs. At room temperature LiNbO 3 is negatively birefringent. The birefringence of LiTaO 3 is very small at room temperature and positive for the congruently melting composition. More information about growth and fundamental properties of LiNbO 3 can be found in [2,3]. 83

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“…Based on the above discussion, we deduce that the Fe 3+ ion in LiNbO 3 :Fe 3+ system may substitute for both Li + and Nb 5+ sites with different environment. In the experimental aspect, both the substitutional Li + and Nb 5+ sites have been, respectively, observed by Sothe et al's ENDOR experiment [34] and Yan et al ' s spectral emission experiment [7].…”

Section: Article In Pressmentioning

confidence: 99%

EPR investigation of substitution position for Fe3+ in LiNbO3:Fe3+ system

Wang

Kuang

Die³

et al. 2005

Physica B: Condensed Matter

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The site and local environment of Fe³⁺in LiNbO₃investigated with ENDOR

Cited by 32 publications

References 9 publications

Experimental and Theoretical Investigation of Spin‐Hamiltonian Parameters for the Low Symmetry Fe³⁺ Centre in LiNbO₃

Experimental and Theoretical Investigation of Spin‐Hamiltonian Parameters for the Low Symmetry Fe³⁺ Centre in LiNbO₃

Photorefractive Effects in LiNbO3 and LiTaO3

EPR investigation of substitution position for Fe3+ in LiNbO3:Fe3+ system

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The site and local environment of Fe3+in LiNbO3investigated with ENDOR

Cited by 32 publications

References 9 publications

Experimental and Theoretical Investigation of Spin‐Hamiltonian Parameters for the Low Symmetry Fe3+ Centre in LiNbO3

Experimental and Theoretical Investigation of Spin‐Hamiltonian Parameters for the Low Symmetry Fe3+ Centre in LiNbO3

Photorefractive Effects in LiNbO3 and LiTaO3

EPR investigation of substitution position for Fe3+ in LiNbO3:Fe3+ system

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The site and local environment of Fe³⁺in LiNbO₃investigated with ENDOR

Experimental and Theoretical Investigation of Spin‐Hamiltonian Parameters for the Low Symmetry Fe³⁺ Centre in LiNbO₃

Experimental and Theoretical Investigation of Spin‐Hamiltonian Parameters for the Low Symmetry Fe³⁺ Centre in LiNbO₃