Radiation-induced paramagnetic silver centers in LiNaSO4

Chandrasekharan, K.; Murty, V.S.

doi:10.1016/0921-4526(95)00409-3

Cited by 13 publications

(6 citation statements)

References 9 publications

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“…The g-factor of Ag 0 is reported to be isotropic and close to the free electron value 2.0023 [12]. On the other hand, the observed values for Ag 2+ indicate considerable g-shifts [12]. As the observed g-values in the present case are similar to the Ag 2+ centre, the ESR lines are tentatively assigned to Ag 2+ .…”

Section: Resultssupporting

confidence: 71%

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ESR and TL mechanism in CaSO₄ : Ag co-doped phosphors

Dhabekar¹,

Menon²,

Raja³

et al. 2006

J. Phys. D: Appl. Phys.

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Thermoluminescence (TL) studies have been carried out on CaSO4 : Mn, CaSO4 : Ag,Mn, CaSO4 : Ag,Nd, CaSO4 : Ag,Mn,Nd, CaSO4 : Ag,Zr and CaSO4 : Ag,Mn,Zr phosphors. It is found that TL at 360 °C in CaSO4 : Ag,Mn,Nd is about 40 times that of CaSO4 : Ag,Mn and about 170 times that of CaSO4 : Ag,Nd. This shows that the presence of an efficient luminescent centre (Mn2+) as well as a trivalent impurity (such as Nd3+ or Y3+) is important for enhancement of TL at 360 °C in the CaSO4 : Ag,Mn,Nd phosphor system. Electron spin resonance (ESR) studies show that the peak at 360 °C correlates with an Ag2+ centre formed due to γ-irradiation and observable only below −170 °C. The Ag2+ centre is characterized by an axial g-tensor with principal values g|| = 2.38 and g⊥ = 2.41. ESR studies further indicate that the precursor to a centre observable at low temperature (−170 °C) appears to act as the recombination centre for the TL peak at 360 °C. The low temperature centre is characterized by the g-values g|| = 2.0023 and g⊥ = 2.0038 and is assigned to the radical.

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Section: Resultssupporting

confidence: 71%

“…However, the Ag + ion can lose or gain an electron on gamma irradiation resulting in the formation of paramagnetic Ag 2+ or Ag 0 centres, respectively. The g-factor of Ag 0 is reported to be isotropic and close to the free electron value 2.0023 [12]. On the other hand, the observed values for Ag 2+ indicate considerable g-shifts [12].…”

Section: Resultsmentioning

confidence: 64%

ESR and TL mechanism in CaSO₄ : Ag co-doped phosphors

Dhabekar¹,

Menon²,

Raja³

et al. 2006

J. Phys. D: Appl. Phys.

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“…3. It is difficult to determine the signs of hyperfine parameters in the EPR experiments [56]. So A || and A ⊥ from the EPR measurements [9] are actually the absolute values.…”

Section: Discussionmentioning

confidence: 99%

An investigation on the EPR parameters and tetragonal distortion for Cu$$^{\mathrm {2+}}$$ center in Mg(CH$$_{\mathrm {3}}$$COO)$$_{\mathrm {2}}\cdot $$ 4H$$_{\mathrm {2}}$$O Crystal

Liu

Qin

et al. 2021

Eur. Phys. J. D

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High-order perturbation formulas of the electron paramagnetic resonance (EPR) parameters for a 3d 9 ion in a tetragonally elongated octahedron (TEO) are applied to theoretical studies of the EPR parameters (i.e., g factors g || , g ⊥ and the hyperfine parameters A || , A ⊥ ) and local structure for Cu 2+ center in Mg(CH3COO)2• 4H2O (MAT). In the calculated formulas, the ligand orbital and spin-orbit coupling contributions are taken into account due to moderate covalency for the studied systems, and the related molecular orbital coefficients are acquired from the superposition model which enables to correlate the crystal-field parameters and hence the EPR parameters with the local structure of [CuO6] 10− cluster. According to the calculations, the octahedral [CuO6] 10− cluster is found to suffer the relative elongation by about 3.7% along C4 axis in MAT crystal, due to the Jahn-Teller effect. The calculated results are in good agreement with the observed values.

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“…6, κ (≈0.3 [8,21]) is the core polarization constant which is related to the unpaired electron density at the nickel nucleus. From the reference distance R 0 and the Slater-type SCF functions [22,23], we calculate the group overlap integrals S dp (π) ≈ 0.007198 and S dp (σ) ≈ 0.026904. Obviously, if the parameters λ π and λ σ are known, the parameters N γ can be calculated by using Eq.…”

Section: Calculation Methodsmentioning

confidence: 99%