TL and OSL studies of carbon doped magnesium aluminate (MgAl2O4:C)

Raj, Sanu S.; Mishra, D.R.; Soni, Anuj; Grover, V.; Polymeris, George S.; Muthe, K.P.; Jha, Sanjay Kumar; Tyagi, A. K.

doi:10.1016/j.radphyschem.2016.06.007

Cited by 16 publications

(6 citation statements)

References 27 publications

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“…The TL glow curves of samples MP, GP, MT1 and GT1 are composed of a broad peak with maxima lying in 490-540 K. The broad TL glow curve consists of a large number of overlapped glow features, inferring the presence of multiple close lying trap states within the forbidden gap. Similar broad glow feature with maxima around 452 K was observed in carbon incorporated MgAl 2 O 4 powders by the electron gun system in which the prompt heat generated by the electrons created multiple traps [26,56]. The reason behind the single broad glow curve in our samples may be the generation of an enormous amount of heat due to which the defects did not get sufficient time to stabilize and hence, the formation of closely spaced energy levels over a large energy range provided a broad TL signal.…”

Section: Tl Analysissupporting

confidence: 67%

“…The undoped and Ce doped MgAl 2 O 4 samples, prepared in a reduced environment and irradiated with UV-rays, have shown two TL peaks at 41 • C and 238 • C corresponding to electron and hole traps, respectively [25]. Raj et al [26] synthesized MgAl 2 O 4 samples by the gel-combustion method using glycine as a fuel and doped carbon by electron-gun and thermo-chemical methods. The undoped sample irradiated with γ-rays did not show any TL peak, while a broad glow curve consisting of several overlapped TL peaks in 273-673 K range was observed with carbon doping [26].…”

Section: Introductionmentioning

confidence: 99%

“…Raj et al [26] synthesized MgAl 2 O 4 samples by the gel-combustion method using glycine as a fuel and doped carbon by electron-gun and thermo-chemical methods. The undoped sample irradiated with γ-rays did not show any TL peak, while a broad glow curve consisting of several overlapped TL peaks in 273-673 K range was observed with carbon doping [26]. Similarly, Tb 3 + doped MgAl 2 O 4 nanocrystals prepared by the combustion method at 550 • C using urea presented broad TL response with three major maxima at 120, 220 and 340 • C with γ-ray irradiation [27].…”

Section: Introductionmentioning

confidence: 99%

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Probing the defects and trap distribution in MgAl₂O₄ nanocrystals through electron spin resonance and thermoluminescence

Dani¹,

Kumar²,

Singh³

et al. 2021

J. Phys. D: Appl. Phys.

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Trap distribution in MgAl2O4 nanocrystals has been investigated by analyzing thermoluminescence (TL) glow curves upon UV-irradiation. To probe various defects and trap distribution with the growth of spinel phase and crystallinity, three different fuels viz. monoethanolamine (MEA), glycine and urea, were employed in the combustion synthesis and annealing was performed at 700 ∘C and 900 ∘C. MEA and glycine resulted in crystalline spinel phase in annealed samples, however, urea resulted in minor secondary phase of MgO with the spinel phase in pristine as well as annealed samples. The x-ray photoelectron spectroscopy informed the presence of minor concentration of C and N in addition to Mg, Al and O, which are expected to influence the various defects of MgAl2O4 samples. The TL glow curve broadening in pristine and 700 ∘C annealed samples inferred the presence of multiple closely distributed traps. Shallow traps were more populated with urea, while higher concentrations of deep traps were observed with MEA and glycine. Computerized glow curve deconvolution of the TL glow curves revealed various trapping parameters. The observed shallow and deep traps have been attributed to various electron and hole centres such as antisite defects, O− and F+ centres. The significant high temperature shift of glow curve maxima in 700 ∘C annealed samples, synthesized using MEA and glycine, might be due to the reorganization of the local energy levels with the growth of spinel phase. Quenching of TL intensity at 900 ∘C anticipated the defect annealing accompanied by clustering of existing defects. Electron spin resonance analysis probed the existence of F+, V− centres and the spin–spin interaction of electron/hole spins trapped at these centres with the nearby cations, and estimated the formation of paramagnetic defect clusters at 900 ∘C annealing. A schematic band model is proposed to illustrate the TL behaviour in MgAl2O4 nanocrystals.

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Section: Tl Analysissupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Probing the defects and trap distribution in MgAl₂O₄ nanocrystals through electron spin resonance and thermoluminescence

Dani¹,

Kumar²,

Singh³

et al. 2021

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

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“…All the Tb-doped MgAl 2 O 4 crystals showed linearly proportional responses from 0.01 mGy, and the lower-concentration Tb-doped crystals showed higher intensity. The sensitivity of the Tb-doped MgAl 2 O 4 crystals is higher than those of ceramic-form MgAl 2 O 4 18,39) and some commercial products (e.g. Chiyoda Technol Corporation).…”

Section: Resultsmentioning

confidence: 90%

Dosimetric properties of Tb-doped MgAl₂O₄ single crystals

Takebuchi

Fukushima

Kato

et al. 2020

Jpn. J. Appl. Phys.

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The photoluminescence (PL), scintillation, and dosimetric properties of Tb-doped MgAl2O4 single crystals were evaluated. In terms of PL and scintillation properties, the Tb-doped crystals showed some emission peaks ascribed to the 4f–4f transitions of the Tb3+ ion. In addition, the optically and thermally stimulated luminescence (OSL and TSL) spectra showed emission peaks considered to be due to the Tb3+ ion. TSL dose response functions were also evaluated, and the Tb-doped crystals showed linear responses from 0.01 mGy.

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“…[5][6][7][8][9][10] Moreover, other researchers have studied undoped, Dy, Tb, and carbon-doped MAS as TSL materials. [11][12][13][14][15][16][17][18] In this study, MAS transparent ceramics doped with Ce were prepared by the spark plasma sintering (SPS) technique as the material for personal dosimetry. In order to verify the abilities of the personal dosimeter, the optical and TSL properties were investigated.…”

Section: Introductionmentioning

confidence: 99%

Dosimetric properties of MgAl₂O₄transparent ceramics doped with Ce

Kato¹,

Nakauchi²,

Kawaguchi³

et al. 2023

Jpn. J. Appl. Phys.

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Ce-doped MgAl2O4 transparent ceramics were fabricated by the spark plasma sintering method. The 0.01% Ce-doped MgAl2O4 exhibited PL peaking at 410 nm upon the excitation of 310 nm. On the other hand, the 0.1, 0.5, and 1% Ce-doped MgAl2O4 showed different PL excitation peaks. The PL peaking at 410 nm was attributed to 5d-4f transitions of Ce3+ ions with a decay time of a few nanoseconds. TSL glow curves were mainly composed of three glow peaks. When Ce-doped MgAl2O4 was heated at 300 °C, three TSL emission peaks were observed at around 410, 520, and 700 nm in TSL spectra, originating from Ce3+ ions, Mn2+ impurities, and Mg2+ vacancies, respectively. The normalized TSL intensity declined to 95% for the first 24 h and did not change in 1–5 days within the measurement error. The minimum detectable dose of the 0.5% Ce-doped MgAl2O4 was 0.5 μGy.

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TL and OSL studies of carbon doped magnesium aluminate (MgAl2O4:C)

Cited by 16 publications

References 27 publications

Probing the defects and trap distribution in MgAl₂O₄ nanocrystals through electron spin resonance and thermoluminescence

Probing the defects and trap distribution in MgAl₂O₄ nanocrystals through electron spin resonance and thermoluminescence

Dosimetric properties of Tb-doped MgAl₂O₄ single crystals

Dosimetric properties of MgAl₂O₄transparent ceramics doped with Ce

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TL and OSL studies of carbon doped magnesium aluminate (MgAl2O4:C)

Cited by 16 publications

References 27 publications

Probing the defects and trap distribution in MgAl2O4 nanocrystals through electron spin resonance and thermoluminescence

Probing the defects and trap distribution in MgAl2O4 nanocrystals through electron spin resonance and thermoluminescence

Dosimetric properties of Tb-doped MgAl2O4 single crystals

Dosimetric properties of MgAl2O4transparent ceramics doped with Ce

Contact Info

Product

Resources

About

Probing the defects and trap distribution in MgAl₂O₄ nanocrystals through electron spin resonance and thermoluminescence

Probing the defects and trap distribution in MgAl₂O₄ nanocrystals through electron spin resonance and thermoluminescence

Dosimetric properties of Tb-doped MgAl₂O₄ single crystals

Dosimetric properties of MgAl₂O₄transparent ceramics doped with Ce