Ionic-to-electronic conductivity transition in an oxide glass doped with gold

Jain, Himanshu; Issa, Ahmed; Anavekar, R. V.; Böhmer, Roland; Kanert, O.; Küchler, R.

doi:10.1063/1.3242416

Cited by 10 publications

(14 citation statements)

References 16 publications

(12 reference statements)

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“…Two activation energies were observed, 1.05 and 0.34 eV. The lower of the two values is related to hopping of small polarons [43]. The mixed polaronic-ionic conductivity was investigated for Li 2 B 8 O 13 glasses doped with different amounts of CuO [44].…”

Section: Thermoluminescence Mechanisms and Trapsmentioning

confidence: 99%

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Li₂B₄O₇:Mn for dosimetry applications: traps and mechanisms

Ratas¹,

Danilkin²,

Kerikmäe³

et al. 2012

Proc. Estonian Acad. Sci.

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Thermoluminescence curves, kinetics, and Electron Paramagnetic Resonance (EPR) data were compared for Li 2 B 4 O 7 :Mn and Li 2 B 4 O 7 :Mn,Be radiation detectors. Analysis of the experimental data, both our own and published by other investigators, in connection with features of the crystal lattice structure allowed us to build models of traps and thermoluminescence mechanisms. The thermoluminescence peaks used in dosimetry are connected with the release of holes trapped at bridging oxygen near Mn 2+ (or Be 2+ ), substituting for tetrahedrally coordinated B 3+ . The luminescence occurs at Mn 2+ substituting for Li + . Two types of Mn 2+ centres give different luminescence and EPR spectra. The effects of Mn 2+ interaction with surrounding oxygen atoms are discussed both for the Mn 2+ luminescence band and for the hyperfine structure of EPR. Kinetics measurements revealed an additional "hopping" barrier for a hole to get to a recombination centre after it has been released from a trap. A simple kinetics model is suggested to describe the experimental data. The studies of optical stimulation spectra and optically stimulated emptying of traps demonstrated the possibility of using Li 2 B 4 O 7 :Mn and Li 2 B 4 O 7 :Mn,Be radiation detectors with optically stimulated readout systems.

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Section: Thermoluminescence Mechanisms and Trapsmentioning

confidence: 99%

“…The values for TiO 2 given in [42] vary from 0.17-0.25 eV for adiabatic polaron transfer to 0.55-0.62 eV for non-adiabatic cases. Ionic-to-electronic conductivity transition was studied in gold-doped lithium borate glass (20Li 2 O·80B 2 O 3 ) [43]. Two activation energies were observed, 1.05 and 0.34 eV.…”

Section: Thermoluminescence Mechanisms and Trapsmentioning

confidence: 99%

Li₂B₄O₇:Mn for dosimetry applications: traps and mechanisms

Ratas¹,

Danilkin²,

Kerikmäe³

et al. 2012

Proc. Estonian Acad. Sci.

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“…A micrograph from scanning electron microscopy (SEM) of an as-quenched LBO glass with 0.02 mol% Au doping was presented elsewhere [18]. A micrograph from scanning electron microscopy (SEM) of an as-quenched LBO glass with 0.02 mol% Au doping was presented elsewhere [18].…”

Section: Experimental Details and Sample Characterizationmentioning

confidence: 99%

“…In the past, the noble metal nanocomposites for optical studies contained alkali ions, which have been generally excluded from the consideration of the development of color. A brief account on some results of LBO has already been given elsewhere [18]. To distinguish the role of alkali ions in color formation vs. electrical conduction, we have chosen for this study two different glasses.…”

Section: Introductionmentioning

confidence: 99%

Electrical Transport in Oxide Glasses Containing Gold Nanoparticles

Issa¹,

Küchler²,

Anavekar³

et al. 2009

Zeitschrift Für Physikalische Chemie

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Glass Structure . Electrical Conductivity . Nano-compositesGold doped ruby glasses are classical examples of metal-glass nanocomposites that have been investigated for their striking optical properties. For their multifunctional applications, we have explored the nature of the electrical response of two oxide glasses containing a small amount (<0.1mol%) of gold. Gold-doped lithium borate (LBO) and lanthanum borogermanate (LBGO) glasses are studied using ac conductivity as a function of frequency and temperature in relation to their structure as determined by electron microscopy. For ionically conducting LBO, Au doping produces a noticeable increase of the electrical conductivity. For poorly conducting LBGO, gold doping introduces a dielectric loss peak indicative of dipolar relaxation. The heat treatment of both glasses introduces a new mechanism of dc conduction or dipolar loss, which has about one third the activation energy of the untreated samples. This unexpected behavior is attributed to an ionic-to-electronic conductivity transition in gold doped glasses.

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“…The addition of transition metal oxides makes such glasses colored and electronic conductors by polaron hopping [12]. Colorless oxide glasses can become colored by an entirely different mechanism when a much smaller amount of noble metal nanoparticles is introduced.…”

Section: Introductionmentioning

confidence: 99%