Ionic Conductivity of Na2SO4–Al2O3 Composite Electrolytes: Mechanism and the Role of the Preparatory Parameters

Jain, Ashish; Saha, Sandeep; Gopalan, P.; Kulkarni, Ajit R.

doi:10.1006/jssc.2000.8764

Cited by 10 publications

(13 citation statements)

References 24 publications

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“…The possibility of I→III transition while cooling the sample during impedance measurement cannot be ruled out, and thus the transition is attributed as being I→III. 3 . It suggests that the fraction of second phase not only influences the conductivity of the host but also the nature of the dispersoid.…”

Section: Resultsmentioning

confidence: 99%

“…In the Na 2 SO 4 -Al 2 O 3 composite system, the formation of the β-alumina phase, a good sodium ion conductor, has been observed for 5.5-mol% Al 2 O 3 dispersion [2,3]. The composite systems Na 2 SO 4 -Y 2 (SO 4 ) 3 -Al 2 O 3 [12] and Na 2 SO 4 -La 2 (SO 4 ) 3 -Al 2 O 3 [13] containing 40-mol% concentration of the second phase have been investigated for sensor applications.…”

Section: Introductionmentioning

confidence: 97%

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Electrical properties of Na2SO4-based composite systems

Bobade

Kulkarni

Gopalan

2007

Ionics

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Composite electrolytes are well-known multiphase systems and exhibit maxima in the conductivity at certain second-phase concentration. An attempt has been made to investigate a number of sodium sulfate (Na 2 SO 4 )-based composite systems. The dispersoids that have been used are MgO, Al 2 O 3 , and SiO 2 . The samples have been characterized using impedance spectroscopy, X-ray diffraction, and differential scanning calorimetry. The maximum conductivity has been observed for MgO dispersed system, and the percolation threshold has been observed at 30-mol% dispersoid, MgO concentration. Interestingly, two maxima have been observed in case of the Na 2 SO 4 -SiO 2 and Na 2 SO 4 -Al 2 O 3 composite systems. In the Na 2 SO 4 -SiO 2 system, the first maximum occurs at lower concentration, i.e., in the range between 10 and 20 mol%, whereas the second occurs at the 40-mol% dispersoid concentration. For the Na 2 SO 4 -Al 2 O 3 system, although slightly indistinguishable, two peaks in the conductivity vs composition plot have been observed around 12-and 30-mol% Al 2 O 3 concentrations.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Electrical properties of Na2SO4-based composite systems

Bobade

Kulkarni

Gopalan

2007

Ionics

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“…One factor, often overlooked, but can help explain our results is that as-received ®ne size particles are invariably highly agglomerated. We have already reported such an agglomeration in case of the Na 2 SO 4 ±Al 2 O 3 composite system [23]. This agglomeration reduces the effective interface area for less than theoretically dense composites, as the matrix material is unlikely to ®ll the deep pores and crevices of the irregular cluster.…”

Section: Effect Of Preparative Parametersmentioning

confidence: 85%

“…Much of the literature, however, comprises of work involving alumina (in the g-Al 2 O 3 form) and silica, though, to a lesser extent. Surprisingly, very recently, we have reported that even the use of a-Al 2 O 3 as a dispersoid has been responsible for a signi®cant enhancement in conductivity of Na 2 SO 4 ±Al 2 O 3 composite system [23].…”

Section: Introductionmentioning

confidence: 94%

Effect of preparative parameters on the electrical conductivity of Li2SO4–Al2O3 composites

Gopalan¹,

Bhandari²,

Kulkarni³

et al. 2002

Materials Research Bulletin

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“…Some studies reported conductivity enhancement through composite formation by using Al 2 O 3 . Jain et al [22] reported a moderate increase in the conductivity of sodium sulphate for composites with 5.5 and 35% Al 2 O 3 . For 35% Al 2 O 3 composition, the conductivity increased by more than 1 order of magnitude at 400 ºC and 2 orders of magnitude at 200 ºC.…”

Section: Introductionmentioning

confidence: 97%

Co‐doping effect of Fe₂O₃ on the ionic transport of Na₂SO₄

Torijano¹,

Vargas

Mellander

2007

Phys. Status Solidi (c)

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Thermal and transport properties of Na 2 SO 4 -Fe 2 O 3 composites, with molar composition in the range x = 0.1-0.5, were studied by using impedance spectroscopy and thermal analysis. The electrical conductivity of this solid solution increases rapidly with increasing Fe 2 O 3 content, from a value at about 0.05 × 10 -4 S/cm (for x = 0.0) up to 0.22 × 10 -4 S/cm for x = 0.1. The largest enhancement in the conductivity is observed for 10, 20 and 40 mol% Fe 2 O 3 compositions, a feature not commonly encountered in known composite systems. The step change in the conductivity of pure sodium sulphate at 241 °C, associated with a first order phase transition, that not only shifts slightly to a higher temperatures when the Fe 2 O 3 content increases, but it is also observed a reduction of the step hight. The results are discussed considering an approximation effect of the nanoparticles on the Na+ transport in the Na 2 SO 4 compound.

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Ionic Conductivity of Na2SO4–Al2O3 Composite Electrolytes: Mechanism and the Role of the Preparatory Parameters

Cited by 10 publications

References 24 publications

Electrical properties of Na2SO4-based composite systems

Electrical properties of Na2SO4-based composite systems

Effect of preparative parameters on the electrical conductivity of Li2SO4–Al2O3 composites

Co‐doping effect of Fe₂O₃ on the ionic transport of Na₂SO₄

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Ionic Conductivity of Na2SO4–Al2O3 Composite Electrolytes: Mechanism and the Role of the Preparatory Parameters

Cited by 10 publications

References 24 publications

Electrical properties of Na2SO4-based composite systems

Electrical properties of Na2SO4-based composite systems

Effect of preparative parameters on the electrical conductivity of Li2SO4–Al2O3 composites

Co‐doping effect of Fe2O3 on the ionic transport of Na2SO4

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Product

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Co‐doping effect of Fe₂O₃ on the ionic transport of Na₂SO₄