Thermoluminescence and linear thermal expansion of MgAl2O4

Samui, Pradeep; Gupta, Neeraj; Dash, Smruti; Dahale, N.D.; Naik, Yeshwant

doi:10.1007/s10973-013-3421-8

Cited by 7 publications

(6 citation statements)

References 27 publications

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“…These observed TL peaks were ascribed to F + and V centres. Thus, the existing study on TL of pure and doped MgAl 2 O 4 in its bulk and nano form implied that the research on undoped MgAl 2 O 4 nanocrystals still needs to be further explored by varying synthesis conditions [9,18,[28][29][30]. Hence, the present research investigated the impact of fuel type and annealing temperature on phase formation, crystallinity, defects induced and trap distribution in MgAl 2 O 4 nanocrystals.…”

Section: Introductionmentioning

confidence: 97%

“…Presence of a large number of vacant sites in the crystal structure triggers the formation of numerous defects and the transformation of an ordered crystal into a disordered crystal. The native defects reported by many researchers, such as electron and hole antisites, oxygen and cation vacancies generate various isolated and complex centres [8,9,17,18]. The defect states created within the band gap act as trap and recombination centres by trapping electrons and holes.…”

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: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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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“…The minimum calcinations temperature, which can be considered for the complete decomposition process and the ferrite formation, can be estimated through TG-DTG-DSC measurements [20,21]. The decomposition begins with the release of hydrated water followed by successive TG steps attributed to the decomposition of the nitrate and organic contents of the precursor.…”

Section: Tg-dtg-dsc Analysismentioning

confidence: 99%

Spectroscopic and thermographic study of Ni–Zn ferrites

Baraliya

Joshi

2014

J Therm Anal Calorim

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In the present work, the spinel ferrites system Ni x Zn 1-x Fe 2 O 4 (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) is synthesized by using auto-combustion method to throw light on the influence of particle size on structural, elastic, and thermal properties of ferrites. The auto-combustion method with some modification is exploited for synthesis of the materials. The X-ray diffractometry was employed to confirm the single phase spinel structure formation and to determine the cell-edge parameters. The elastic properties are studied by using Fourier transform infrared transmission spectroscopy (FTIR) at 27°C. The force constants for tetrahedral (A) and octahedral (B) sites of the spinel lattice are determined through infrared spectral analysis. The elastic constants like Bulk modulus, Rigidity modulus, Young's modulus, and Poisson's ratio are determined. Thermography is used to study thermal process of the combustion reaction, and thermal study is used to determine thermal parameters. Main idea is to minimize the synthesis cost of the ferrite materials used together with tailoring the structural, elastic, and thermal properties of the ferrites required for the desired applications.

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“…XRD is widely used in studies. Nowadays, many researches about thermal expansion are concentrated on the inorganic materials [17][18][19] and metal-organic frameworks (MOFs) [20][21][22], while the studies about energetic materials are less. Our group has obtained exact and reliable CTEs of RDX [23], HMX [24], HNS [25], and TATB [26,27] by using X-ray powder diffraction and Rietveld refinement.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the thermal expansion of α-CL-20 with different water contents

Liu

Song

et al. 2015

J Therm Anal Calorim

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The thermal expansions of three kinds of a-CL-20 crystals have been investigated in the temperature range from 30 to 130°C by means of various-temperature X-ray powder diffraction (XRD) together with Rietveld refinement. The crystals were characterized by SEM, XRD, FTIR, and DSC/TG. The results show that the three samples contain 1/2, 1/4 mol, and none structural water, respectively. The a-CL-20 crystals all perform linear and anisotropic thermal expansion, while some differences exist. The unit-cell axes increase linearly with increasing temperature except for the a-axis. The expansion along the a-axis switches from positive to negative thermal expansion at 90°C for a-CL-20Á1/2H 2 O. The a-axis exhibits positive thermal expansion (PTE) with thermal irresilience for a-CL-20Á1/4H 2 O while PTE with thermal resilience for the anhydrous a-CL-20. The differences are caused by the structural water. The removal of structural water leads to the collapse of a-axis, further results in structural changes of the unit cell. Different water contents can cause different degree of structural changes, leading to the difference of thermal expansion behaviors.

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Thermoluminescence and linear thermal expansion of MgAl2O4

Cited by 7 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

Spectroscopic and thermographic study of Ni–Zn ferrites

Investigation on the thermal expansion of α-CL-20 with different water contents

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Thermoluminescence and linear thermal expansion of MgAl2O4

Cited by 7 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

Spectroscopic and thermographic study of Ni–Zn ferrites

Investigation on the thermal expansion of α-CL-20 with different water contents

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Product

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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