Ionic conduction in Li2Ge7O15 crystals doped with Cr and Mn ions

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

doi:10.1134/s106378340807007x

Cited by 14 publications

(19 citation statements)

References 2 publications

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“…For undoped Li 2 Ge 7 O 15 crystals at T = 650 K, during the observation time (150 min), reduction in σ by a factor of 4 was detected. Since the ion contribu tion to electrical conductivity in samples doped with Cr (0.1% wt) noticeably increases [3], the decrease of σ(t) of Li 2 Ge 7 O 15 :Cr in a DC current must be expressed more distinctly. Measurements that, at T = 700 K, the electrical conductivity of Li 2 Ge 7 O 15 :Cr crystals decreases for 120 min by two orders of magnitude ( Fig.…”

Section: Electrical Conduction In a Direct Current Field And Diffusiomentioning

confidence: 99%

“…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%

“…In the measurements, the external field E was directed parallel to the axis a along which the structural channels containing Li ions were oriented [4]. The studies were performed for temperatures T > 500 K, at which the Li ion conduction dominated [2,3].…”

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

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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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Section: Electrical Conduction In a Direct Current Field And Diffusiomentioning

confidence: 99%