General order and mixed order fits of thermoluminescence glow curves—a comparison

Sunta, C.M.; Ayta, Walter Elias Feria; Chubaci, J.F.D.; Watanabe, Shigueo

doi:10.1016/s1350-4487(01)00257-8

Cited by 45 publications

(20 citation statements)

References 19 publications

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“…Moreover, at high temperature side, m ≈ nc and the TL peak obtained will have a long tail at the high temperature side (Chen and Pagonis (2013b)). According to Sunta et al (2002), at high temperature region, the quasi-equilibrium condition becomes less satisfied and kinetic parameters measured yield incorrect results. This is the reason the effective activation energy and frequency factor obtained had low values.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…The increase in retrapping effect is a result of increase in density of empty traps which are available for retrapping (Ogundare and Chithambo (2006)). When the glow curve shifts to a high temperature side and in this region, quasiequilibrium condition applied becomes less satisfied (Sunta et al (2002)), therefore the kinetic parameters calculated by using any method may be inaccurate. In a one trap-one recombination centre model (OTOR), Bräunlich (1967) and Sunta et al (1999) had pointed out that if retrapping effect is strong and traps are filled to saturation, the methods used such as peak-shape and initialrise would yield low values of effective activation energy.…”

Section: Akpan Dianabasi Ekanem Akanimo and Ebiang Basil / Journal mentioning

confidence: 99%

“…The reason for this little variance in the expected kinetic parameters could be attributed to high retrapping effect. Moreover, as the glow peak shifts to a high temperature side, the quasi-equilibrium condition becomes less satisfied (Sunta et al (2002)), thereby affecting the accuracy of the kinetic parameters measured by any of the methods used.…”

Section: Akpan Dianabasi Ekanem Akanimo and Ebiang Basil / Journal mentioning

confidence: 99%

See 2 more Smart Citations

A Three-stage Thermal Stimulation of Thermoluminescence (Tl)

Dianabasi¹,

Akanimo²,

Basil³

2017

JLA

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A three-stage thermal stimulation of thermoluminescence is studied. Three assumed conditions are applied to this model and the analytical expressions are compared with the numerical results. For condition 1: effective activation energy, Eeff ≈ E1 + E2 + E3, effective frequency factor, seff ≈ s2s3/p2 and effective retrapping probability coefficient, An,eff ≈ An. The expected Eeff is obtained. For condition 2: Eeff ≈ E1 + E2, seff ≈ (s1s2/p1)exp(E3/kT) and An,eff ≈ (p2/s3)exp(E3/kT)An. In this case, Eeff reduces from 'E1 + E2 + E3' to 'E1 + E2' as a result of the exponential temperature dependence on seff. For condition 3: Eeff ≈ E1, seff ≈ s1exp[(E2 + E3)/kT] and An,eff ≈ (p1p2/s2s3)exp[(E2 + E3)/kT]An. The obtained Eeff reduces from 'E1 + E2 + E3' to 'E1' as a result of the exponential temperature dependence on seff. From the first-order kinetics, the numerical results were found to be in very good agreement with the analytical expressions. From the second-order kinetics, the numerical results did not agree with analytical expressions and explanation has been offered. In the assumed conditions 2 and 3, the exponential temperature dependence on An,eff did not affect the shape of the TL peak provided the chosen trapping parameters were within the confine of the assumed conditions. Evaluation of life-time of the excited signal to determine its stability is considered.

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Section: Numerical Results and Discussionmentioning

confidence: 99%

Section: Akpan Dianabasi Ekanem Akanimo and Ebiang Basil / Journal mentioning

confidence: 99%

Section: Akpan Dianabasi Ekanem Akanimo and Ebiang Basil / Journal mentioning

confidence: 99%

See 1 more Smart Citation

A Three-stage Thermal Stimulation of Thermoluminescence (Tl)

Dianabasi¹,

Akanimo²,

Basil³

2017

JLA

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“…The relationship among the α-values and b (kinetics order) showed that the overall scattering of the values found for b corresponding to any value found of α was within approximately 710% (Sunta et al, 2002). The α-values for peak III of the samples (A, B and C) were found to be 0.4-0.9, evidencing that b ranged between 1.2 and 1.7.…”

Section: Concentration Solvent Depth Film [Nm]mentioning

confidence: 86%

Thermoluminescence and photoluminescence analyses of MEH-PPV, MDMO-PPV and RU(bpy) 3 gamma-irradiated polymer thin films

Ortiz-Morales

Ortíz-López

Cruz-Zaragoza

et al. 2015

Applied Radiation and Isotopes

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“…(8). The theoretical lacunae suffered by the GOK expression in TL have been discussed in the papers of Sunta et al [17,18]. Thus its validity in OSL is also questioned.…”

Section: Introductionmentioning

confidence: 99%