EPR study of radiation-induced defects in the thermoluminescence dating medium zircon (ZrSiO<sub>4</sub>)

Laruhin, M. A.; Es, H.J. van; Bulka, G. R.; Turkin, A. A.; Vainshtein, D.I.; Hartog, H. W. den

doi:10.1088/0953-8984/14/14/312

Cited by 41 publications

(44 citation statements)

References 26 publications

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“…Extra confirmation of our identification of T1 and T2 as Tb 4+ centres comes from a limited number of literature reports on Tb 4+ in oxide crystals [18][19][20][21][22][23][24]. In these papers, the secondorder ZFS parameters for Tb 4+ centres were found to be typically an order of magnitude larger than those for Gd 3+ centres in the same (or very similar) environments.…”

Section: Tb-related Radiation-induced Centressupporting

confidence: 71%

“…In most of the previous observations of Tb 4+ , the four-lines hyperfine splitting ( 159 Tb isotope with I = 3/2, 100 % natural abundance) of the EPR transitions served as ultimate proof for the identification. Resolved hyperfine interaction constants ranging from ~11 MHz in CaWO 4 [18] to ~100 MHz in ZrSiO 4 [22,23] have been reported in these oxide crystals. For the T1 -T3 centres, no such four-lines splitting is observed.…”

Section: Tb-related Radiation-induced Centresmentioning

confidence: 99%

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Electron paramagnetic resonance study of rare-earth related centres in K2YF5:Tb3+ thermoluminescence phosphors

et al. 2011

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Rare-earth related centres have been investigated in K 2 YF 5 :Tb 3+ crystals, exhibiting thermoluminescence (TL) below and above room temperature (RT), using electron paramagnetic resonance (EPR) spectroscopy at Q (34 GHz) and W-band (94 GHz). The spectra have been studied prior to irradiation, after exposure in the kGy range to X-rays at 77 K and subsequent pulse annealing up to 570 K. In addition to Gd 3+ , previously studied in detail, we identified Er 3+ and Yb 3+ centres as accidental impurities in as-grown crystals and determined their effective g tensors. The EPR spectra of irradiated and annealed crystals provide evidence for the production of at least three distinct Tb-related trapped hole centres, two of which could definitely be identified as Tb 4+. Hence, we prove that the Tb 3+ activator ions also act as hole traps in K 2 YF 5 . Pulse annealing experiments indicate that the TL above RT results from thermal release of electrons, recombining at these Tb 4+ ions.

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Section: Tb-related Radiation-induced Centressupporting

confidence: 71%

Section: Tb-related Radiation-induced Centresmentioning

confidence: 99%

Electron paramagnetic resonance study of rare-earth related centres in K2YF5:Tb3+ thermoluminescence phosphors

et al. 2011

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“…Laruhin et al (2002) also demonstrated that lattice defects with thermal instability in SiO m n− groups (e.g., SiO 2 3− defect) easily evanesce even above 120°C and subsequently supply the trapped hole at this thermally instable site into more stable defects such as SiO 2 3− (II). Therefore, the annealing promotes to transfer a part of holes temporarily trapped at thermally instable defect (Laruhin et al, 2002) or impurity such as REEs (Klinger et al, 2012) into the stable lattice defect related to the yellow CL emissions, that is, Frenkel-type defects and SiO m n− groups, resulting in an increase in the yellow emission with a rise in temperature up to 300°C. The Frenkel-type defects and SiO m n− groups may be gradually eliminated from 400 to 600°C and then disappeared above 700°C for 12 hours, which may be responsible for the reduction and absence of the yellow emission bands observed in CL spectra of the MZ sample.…”

Section: Yellow Emission Bandmentioning

confidence: 92%

“…These phenomena concerning yellow PL and IL emissions may be caused by a formation of lattice defect. Based on comparisons of the luminescent properties with ESR data obtained from previous studies (Gaft et al, 2002;Laruhin et al, 2002), Finch et al (2004) assigned the yellow emissions to Frenkel-type defects and SiO m n− groups because a variation of ESR signal patterns are mostly corresponding to those of IL and PL behaviors and these defect centers are relatively thermally-stabile compared with other type of defects formed by radiation. On the other hands, it is known that (UO 2 ) 2+ also acts as an activator in PL and laser-induced luminescence of zircon in yellow spectral region (Gaft et al, 2002;MacRae and Wilson.…”

Section: Yellow Emission Bandmentioning

confidence: 98%

Annealing effects on cathodoluminescence of zircon

Tsuchiya

Kayama

Nishido

et al. 2015

Journal of Mineralogical and Petrological Sciences

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Color cathodoluminescence (CL) images of zircon from southern Malawi (MZ) show mottled yellow CL emissions on a dull luminescent background by the annealing below 600°C, and relatively homogeneous blue emissions above 800°C. CL spectroscopy of the samples reveals a change of the luminescent features with an annealing temperature, and explains a variation of their colors and luminance observed by a CL microscope. Emission bands at 310 and 380 nm in an ultraviolet (UV) to blue CL are assigned to intrinsic centers in host lattice, narrow peaks at 475 and 580 nm to Dy 3+ impurity centers, and broad bands at 500 to 650 nm to Frenkeltype defects and SiO m n− groups. The former two show increases in emission intensities against annealing temperature, but the latter exhibits an increase in intensity up to 300°C and a decrease above 300 to 700°C. An increase in an annealing temperature leads to a reproduction of the intrinsic centers, which is responsible for an increase in UV-blue emission, in host lattice accompanied with a recrystallization from metamict state. An increase in the intensities of narrow peaks activated by Dy 3+ impurities may result possibly from a recovery of ionization due to the self-radiation and an energy transfer of other REEs to Dy 3+ activator. A gradual increase in yellow emission bands up to 300°C might be caused by a migration of the hole around a thermally-instable lattice defect and/or activated impurities into a more stable site related to Frenkel-type defects and SiO m n− groups, whereas the yellow should be subsequently reduced due to an elimination of these defects.

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“…Therefore the thermoluminescence (TL) and electron paramagnetic resonance (EPR) caused by some trivalent rareearth (Tb 3+ , Dy 3+ ) ions in zircon was recently studied [8,9]. However few studies on actinide (5f n ) ions in zircon have been performed.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Investigations Of The Spin Hamiltonian Parameters Of Zrsio₄:Np⁴⁺

Dong

2004

Zeitschrift Für Naturforschung A

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In this work, the spin Hamiltonian (SH) parameters g and g ⊥ , and the hyperfine structure constants A and A ⊥ for ZrSiO 4 :Np 4+ are investigated on the basis of the perturbation formulas of these parameters for a 5f 3 ion in tetragonal (D 2d ) symmetry. In these formulas, the contributions to the SH parameters from the second-order perturbation terms, the admixtures of various energy levels and the covalency effect are taken into account. The related crystal-field parameters are calculated from the superposition model and the local structural data of the Zr 4+ site occupied by the impurity Np 4+ . The calculated SH parameters agree reasonably with the experimental data. The validity of the theoretical results is discussed.

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EPR study of radiation-induced defects in the thermoluminescence dating medium zircon (ZrSiO₄)

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Cited by 41 publications

References 26 publications

Electron paramagnetic resonance study of rare-earth related centres in K2YF5:Tb3+ thermoluminescence phosphors

Electron paramagnetic resonance study of rare-earth related centres in K2YF5:Tb3+ thermoluminescence phosphors

Annealing effects on cathodoluminescence of zircon

Theoretical Investigations Of The Spin Hamiltonian Parameters Of Zrsio₄:Np⁴⁺

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EPR study of radiation-induced defects in the thermoluminescence dating medium zircon (ZrSiO4)

Abstract: Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

Cited by 41 publications

References 26 publications

Electron paramagnetic resonance study of rare-earth related centres in K2YF5:Tb3+ thermoluminescence phosphors

Electron paramagnetic resonance study of rare-earth related centres in K2YF5:Tb3+ thermoluminescence phosphors

Annealing effects on cathodoluminescence of zircon

Theoretical Investigations Of The Spin Hamiltonian Parameters Of Zrsio4:Np4+

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EPR study of radiation-induced defects in the thermoluminescence dating medium zircon (ZrSiO₄)

Theoretical Investigations Of The Spin Hamiltonian Parameters Of Zrsio₄:Np⁴⁺