Heterogeneous electrolytes: Variables for and uncertainty in conductivity measurements

Kumar, Binod

doi:10.1016/j.jpowsour.2007.12.103

Cited by 18 publications

(7 citation statements)

References 14 publications

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“…The properties of AlPO 4 are similar to SiO 2 and it is a dielectric. In a recent publication 14 it has been shown that dielectric dopants in an ionic conducting solid interact with the conducting species to form a charged complex that becomes a source of space charge that mediates transport for conducting ions. In the case of AlPO 4 , a reaction as expressed by Eq.…”

Section: Resultsmentioning

confidence: 99%

Superionic Conductivity in a Lithium Aluminum Germanium Phosphate Glass–Ceramic

Thokchom

Gupta

Kumar

2008

J. Electrochem. Soc.

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142

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In this paper, processing and characterization of sheet, pellet, and membrane specimens based on the lithium aluminum germanium phosphate (LAGP) glass–ceramic system is reported. X-ray diffraction patterns exhibited the presence of normalLi1+xnormalAlxnormalGe2−x(PnormalO4)3 (x=0.5) as the primary phase. Increasing heat-treatment temperature from 850to950°C led to the precipitation of an impurity phase, AlPnormalO4 , and a large increase in LAGP grain size. The highest total conductivity of the LAGP glass–ceramic material (5.08×10−3S∕cm) at 27°C was obtained by crystallizing the glass sheet at 850°C for 12h . The total conductivity of the specimen was in the range of 10−3–10−1S∕cm in the 0–107°C temperature range. The pelletized specimen prepared from the glass–ceramic powder and sintered at 850°C for 9h exhibited a slightly lower conductivity (4.62×10−3S∕cm) at 27°C . The membrane conductivity was above 10−3S∕cm in the 37–107°C temperature range. High grain boundary conductivity is apparent in the LAGP glass-ceramic materials. The impurity phases AlPnormalO4 and normalLi2O were attributed to a characteristic nonlinearity in the Arrhenius plots and mediated the transport of the lithium ion, which is associated with a higher activation energy.

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Section: Resultsmentioning

confidence: 99%

Superionic Conductivity in a Lithium Aluminum Germanium Phosphate Glass–Ceramic

Thokchom

Gupta

Kumar

2008

J. Electrochem. Soc.

Self Cite

142

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show abstract

“…The properties of AlPO 4 are similar to SiO 2 , and it is a dielectric. In a recent publication, Kumar [19] showed that dielectric dopants in an ionic conducting solid interact with the conducting ion to form a charged complex creating a localized field. This formation of a space charge region influences the transport of the remaining free ions and thus enhances the conductivity.…”

Section: Ac Impedance and Ionic Conductivitymentioning

confidence: 99%

Composite effect in superionically conducting lithium aluminium germanium phosphate based glass-ceramic

Thokchom

Kumar

2008

Journal of Power Sources

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“…In a recent publication, the variables for conductivity measurement in heterogeneous electrolytes have been reported [5]. One of the variables is the temperature dependent formation and destruction of the space charge.…”

Section: Introductionmentioning

confidence: 99%