Anisotropy of the electrical conductivity of lithium heptagermanate crystals

Volnyanskiı̆, M. D.; Trubitsyn, M. P.; Obaidat, Yahia A. H.

doi:10.1134/s1063783408030049

Cited by 13 publications

(20 citation statements)

References 4 publications

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“…It is seen that all the dependences expressed in the Arrhenius coor dinates are straight lines with almost the same slope at T > 500 K. In this case, composition 1 with the maxi mum fraction of Li 2 O has the maximum conductivity. This fact confirms the conclusion on a dominant con tribution of mobile Li ions to the conductivity of lith ium germinate [4]. The dependence of σ(1/T) on the state of the glass ceramics is shown for composition 1 in Fig.…”

Section: Resultssupporting

confidence: 86%

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Thermal and electrical properties of glass-ceramics based on lithium heptagermanate

2012

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Section: Resultssupporting

confidence: 86%

“…The temperature dependence of the conductivity σ(T) was measured taking into account the data on the mechanism of conductivity in LGO single crystals [4]. Figure 2a shows the σ(1/T) dependences for composi tions 1-3 in the initial state of the glass.…”

Section: Resultsmentioning

confidence: 99%

Thermal and electrical properties of glass-ceramics based on lithium heptagermanate

2012

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“…Mea surements performed in an AC field with the frequen cies of 10 2 -10 5 Hz made it possible to conclude that the conduction of Li 2 Ge 7 O 15 is determined by hopping of interstitial lithium ions A Li along channels of the crystal structure [4]. Ag and Pt electrodes used in [2,3] block the Li ion transport. Therefore, at low frequen cies of the measuring field, capacitive effects caused by accumulation of charge carriers near the blocking electrodes should appear.…”

Section: Introductionmentioning

confidence: 99%

“…In earlier works [2,3], the electrical conductivity σ of pure and Cr and Mn doped Li 2 Ge 7 O 15 crystals was studied. Mea surements performed in an AC field with the frequen cies of 10 2 -10 5 Hz made it possible to conclude that the conduction of Li 2 Ge 7 O 15 is determined by hopping of interstitial lithium ions A Li along channels of the crystal structure [4].…”

Section: Introductionmentioning

confidence: 99%

“…Kinetic dependences of the electrical conductivity σ(t) in a DC electric field and the spectra of the complex impedance ρ*( f ) in the frequency range 10 1 -10 5 Hz were measured. The information on Li 2 Ge 7 O 15 single crystal growth and sample preparation is given in [2,3]. The electrical conductivity σ and the spectra of the complex imped ance ρ*( f ) were measured by using standard equip ment.…”

Section: Introductionmentioning

confidence: 99%

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Ion conduction and space-charge polarization processes in Li2Ge7O15 crystals

et al. 2012

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The electrical properties of a lithium heptagermanate (Li 2 Ge 7 O 15 ) crystal have been studied in DC and AC measuring fields at temperatures from 500 to 700 K. In a DC field, a substantial decrease of elec trical conductivity σ with time has been detected. On the basis of kinetic dependences σ(t), estimates of the charge carrier diffusion coefficient D have been obtained. In the frequency range 10 1 -10 5 Hz, the spectra of complex impedance ρ*( f ) have been measured. The analysis of diagrams in the complex plane (ρ'' -ρ') has been performed within the equivalent circuit approach. It has been shown that, in the considered temperature and frequency intervals, the electrical properties of Li 2 Ge 7 O 15 crystals have been determined by the hopping conduction of interstitial lithium ions A Li and accumulation of charge carriers near the blocking Pt elec trodes.

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