Lattice site determination of Co in low doped congruent LiNbO3 single crystal using PIXE/channelling

Szilágyi, E.; Becze-Deák, T.; Bottyán, L.; Kocsonya, A.; Kótai, E.; Nagy, D. L.; Kling, A.; Battistig, G.; Khanh, N.Q.; Polgár, K.

doi:10.1016/s0038-1098(00)00239-8

Cited by 7 publications

(3 citation statements)

References 17 publications

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“…The lattice site of Co in LN was studied by Szilagy et al [215] in melt-doped (0.2 mol% CoO) congruent material. In this case, a He + ion beam was used to obtain PIXE/C scans for Co-and Nb-PIXE with pronounced dips for five major axial directions.…”

Section: Dopants To Enhance Photorefractive Damagementioning

confidence: 99%

Unveiling the Defect Structure of Lithium Niobate with Nuclear Methods

Kling

Marques

2021

Crystals

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X-ray and neutron diffraction studies succeeded in the 1960s to determine the principal structural properties of congruent lithium niobate. However, the nature of the intrinsic defects related to the non-stoichiometry of this material remained an object of controversial discussion. In addition, the incorporation mechanism for dopants in the crystal lattice, showing a solubility range from about 0.1 mol% for rare earths to 9 mol% for some elements (e.g., Ti and Mg), stayed unresolved. Various different models for the formation of these defect structures were developed and required experimental verification. In this paper, we review the outstanding role of nuclear physics based methods in the process of unveiling the kind of intrinsic defects formed in congruent lithium niobate and the rules governing the incorporation of dopants. Complementary results in the isostructural compound lithium tantalate are reviewed for the case of the ferroelectric-paraelectric phase transition. We focus especially on the use of ion beam analysis under channeling conditions for the direct determination of dopant lattice sites and intrinsic defects and on Perturbed Angular Correlation measurements probing the local environment of dopants in the host lattice yielding independent and complementary information.

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Section: Dopants To Enhance Photorefractive Damagementioning

confidence: 99%

Unveiling the Defect Structure of Lithium Niobate with Nuclear Methods

Kling

Marques

2021

Crystals

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“…When a Co 2+ ion is doped into LiNbO 3 and LiTaO 3 , it may locate substitutionally on Li + site due to their similar charges [19,23] and form the trigonal Co 2+ centers (i.e., [CoO 6 ] 10− clusters). The 4 T 1 (F) ground state for a 3d 7 (Co 2+ ) ion under trigonally distorted octahedra may split into six Kramers doublets (belonging to J = 1/2, 3/2 and 5/2 states, respectively) due to the spin-orbit coupling and crystal-field interactions, with J = 1/2 state lying lowest [24,25] energy separation between J = 1/2 and 3/2 states is usually a few hundred wave numbers based on the theoretical expectations from cubic crystal-field scheme [24,25].…”

Section: Calculationsmentioning

confidence: 99%

Theoretical investigations of the local structures and spin Hamiltonian parameters for the trigonal Co2+ centers in LiNbO3 and LiTaO3

Wei

et al. 2009

Journal of Alloys and Compounds

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“…Detailed localization analysis for Be is challenging with He + -RBS/C or p-EBS/C because of the small yield and/or high signal to background ratio in channeling conditions for Be located at substitutional lattice sites. The detailed analysis of interstitials and substitutional atoms in BeMgZnO requires careful multiaxial channeling experiments and angular scans [51] and is out of the scope of this paper.…”

Section: Resultsmentioning

confidence: 99%

Nondestructive atomic compositional analysis of BeMgZnO quaternary alloys using ion beam analytical techniques

Zolnai

Toporkov

Volk

et al. 2015

Applied Surface Science

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HighlightsBeMgZnO thin layers were grown with plasma assisted molecular beam epitaxy (MBE)The Be contents were accurately measured with RBS and proton elastic backscattering The Tauc bandgap was measured from optical transmittance experiments The bandgap has been varied between 3.26 eV and 4.62 eV via the Be and Mg content Experimental and density functional theory calculated bandgaps were in good agreement AbstractThe atomic composition with less than 1-2 atom % uncertainty was measured in ternary BeZnO and quaternary BeMgZnO alloys using a combination of nondestructive Rutherford backscattering spectrometry with 1 MeV He + analyzing ion beam and nonRutherford elastic backscattering experiments with 2.53 MeV energy protons. An enhancement factor of 60 in the cross-section of Be for protons has been achieved to monitor Be atomic concentrations. Usually the quantitative analysis of BeZnO and BeMgZnO systems is challenging due to difficulties with appropriate experimental tools for the detection of the light Be element with satisfactory accuracy. As it is shown, our applied ion beam technique, Page 2 of 22A c c e p t e d M a n u s c r i p t supported with the detailed simulation of ion stopping, backscattering, and detection processes allows of quantitative depth profiling and compositional analysis of wurtzite BeZnO/ZnO/sapphire and BeMgZnO/ZnO/sapphire layer structures with low uncertainty for both Be and Mg. In addition, the excitonic bandgaps of the layers were deduced from optical transmittance measurements. To augment the measured compositions and bandgaps of BeO and MgO co-alloyed ZnO layers, hybrid density functional bandgap calculations were performed with varying the Be and Mg contents. The theoretical vs. experimental bandgaps show linear correlation in the entire bandgap range studied from 3.26 eV to 4.62 eV. The analytical method employed should help facilitate bandgap engineering for potential applications, such as solar blind UV photodetectors and heterostructures for UV emitters and intersubband devices.

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Lattice site determination of Co in low doped congruent LiNbO3 single crystal using PIXE/channelling

Cited by 7 publications

References 17 publications

Unveiling the Defect Structure of Lithium Niobate with Nuclear Methods

Unveiling the Defect Structure of Lithium Niobate with Nuclear Methods

Theoretical investigations of the local structures and spin Hamiltonian parameters for the trigonal Co2+ centers in LiNbO3 and LiTaO3

Nondestructive atomic compositional analysis of BeMgZnO quaternary alloys using ion beam analytical techniques

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