Effect of Homovalent Anion Doping on the Conductivity and Phase Transitions in Na2SO4

Gomathy, S.; Gopalan, P.; Kulkarni, Ajit R.

doi:10.1006/jssc.1999.8258

Cited by 10 publications

(8 citation statements)

References 23 publications

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“…Figure 4 gives the IR spectra of thenardite calcined at different temperature in the range of 400-4000 cm −1 . In the obtained spectra, it is possible to distinguish clearly the ranges corresponding to the vibrations of the SO 4 2− group and the Na-O vibrations ( Table 2).…”

Section: Ftir Studiesmentioning

confidence: 99%

“…Phase I, and II are high-temperature polymorphs however, phase II is reported to have a narrow stability zone. Phase IV is considered to be metastable and its phase relation and structure have yet to be well established [4][5][6][7]. Correcher et al observed the spectra of infrared-stimulated luminescence (IRSL), radioluminescence (RL), and TL of thenardite but they did not identify the origin of the luminescence center related to the IRSL, RL, and TL spectra of thenardite [8].…”

Section: Introductionmentioning

confidence: 99%

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Preparation, Characterization, and Luminescence Properties of Orthorhombic Sodium Sulphate

Vidya

Lakshminarasappa

2013

Physics Research International

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A highly efficient thermoluminescence Na 2 SO 4 phosphor with thenardite polymorphic structure was prepared by simple slow evaporation technique followed by subsequent calcination at 200 ∘ C, 400 ∘ C, and 600 ∘ C for 4 h and the resultant crystals were characterized by various analytical techniques. All the samples exhibited thermodynamically stable thenardite phase and the grain growth was increased for the calcined samples. SEM analysis indicated the fine distribution of twinned orthogonal prism and pyramidal structure without any agglomeration. The electron spin resonance spectroscopy showed the existence of SO 4 − radicals as trap centre. The thermoluminescence behavior suggested the charge carrier recombination dynamics in the thenardite sample followed second-order kinetics. The trapping parameters such as activation energy ( ), order of kinetics ( ), and frequency factor ( ) have been determined using Chen's peak shape method. Further fading of the TL intensity of Na 2 SO 4 showed that thenardite is quite suitable for radiation dosimetry even up to 15 days. The photoluminescence band of Na 2 SO 4 reduced in its intensity after -irradiation, suggesting that defects are unstable and decay rapidly.

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Section: Ftir Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation, Characterization, and Luminescence Properties of Orthorhombic Sodium Sulphate

Vidya

Lakshminarasappa

2013

Physics Research International

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“…Since the c/a ratio in pure and Na CO doped Na SO do not di!er, it implies that there is no change in the bottleneck size for the di!using Na> along directions in the a}b plane. However, Gomathy et al (59) also observed that the orientational ordering is possible only to a limited extent, as phase I is stabilized only by the 2 and 4 m/o Na CO compositions. At higher concentrations, it has been reported that the lattice contraction due to the smaller sized CO\ becomes predominant, and increases the activation energy, resulting in a lower conductivity for the 5 m/o and the 10 m/o Na CO compositions.…”

Section: B Homovalent Cation and Anion Substitution In Na 2 Somentioning

confidence: 95%

“…This enhancement in conductivity was attributed to e!ects associated with the dispersion of "ne particles of a second phase (LiNaSO ). Recently, Gomathy et al (59) conducted a systematic investigation of the e!ect of homovalent anion doping on the conductivity and phase transitions in Na SO . They concluded that apart from the size, the shape, and the orientational ordering of the dopant ion in the sulfate sublattice appeared to in#uence the activation energy.…”

Section: B Homovalent Cation and Anion Substitution In Na 2 Somentioning

confidence: 99%

On the Various Approaches to Enhancing the Conductivity of Sodium Sulfate: Review and Current Developments

Gopalan

Saha

Bobade

et al. 2000

Journal of Solid State Chemistry

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“…Phases I and II were high-temperature polymorphs; however, phase II was reported to have a narrow stability zone. Phase IV was considered to be metastable, and its phase relation and structure have yet to be well established [13][14][15][16]. Mixed sulfates such as K 2 Ca 2 (SO 4 ) 3 and LiNaSO 4 have been of much interest to researchers [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Influence of Li+ and Dy3+ on structural and thermoluminescence studies of sodium sulfate

Vidya

Lakshminarasappa

2014

Appl. Phys. A

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Na 2 SO 4 , Na 2 SO 4 : Dy 3? , LiNaSO 4 and LiNaSO 4 : Dy 3? nanoparticles successfully synthesized by slow evaporation technique followed by calcination at 400 o C. The resultant products were characterized by powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared and UVVis spectroscopy. The average crystallite size was calculated using Debye-Scherrer's formula and WilliamsonHall's (W-H) plots. The optical energy band gap (E g ) was estimated from Wood and Tauc's relation, which varies from 3.70 to 4.45 eV. The variation in band gap values attributed to large degree of structural defects. Thermoluminescence studies were investigated using c-irradiation in the dose range 0.5-5 kGy at a heating rate of 5 K s -1 . The samples Na 2 SO 4 and LiNaSO 4 showed a well-resolved glow peak at *180 and *170°C, respectively. The prominent glow peak at *175°C along with shouldered peak at *60°C was observed for Na 2 SO 4 : Dy 3? . LiNaSO 4 : Dy 3? showed prominent glow peak at *100°C and a small shoulder peak at *180°C. The addition of isovalent (Li ? ) quenches the TL intensity, whereas the hypervalent (Dy 3? ) increases the intensity of Na 2 SO 4 . The variations of TL intensity for all the phosphors follow linear behavior up to 5 kGy and were useful in radiation dosimetry. The kinetic parameters (E, b and s) were estimated from the glow peak shape method.

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Effect of Homovalent Anion Doping on the Conductivity and Phase Transitions in Na2SO4

Cited by 10 publications

References 23 publications

Preparation, Characterization, and Luminescence Properties of Orthorhombic Sodium Sulphate

Preparation, Characterization, and Luminescence Properties of Orthorhombic Sodium Sulphate

On the Various Approaches to Enhancing the Conductivity of Sodium Sulfate: Review and Current Developments

Influence of Li+ and Dy3+ on structural and thermoluminescence studies of sodium sulfate

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