Electrical resistivity study of some lead-borate glasses

Burzo, E.; Ardelean, I.; Ungur, D.

doi:10.1016/0038-1098(85)90053-5

Cited by 10 publications

(1 citation statement)

References 12 publications

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“…In Fig. 9 s dc varies linearly with 1/T in the two temperature regions, indicating that the conduction of the glasses is mainly electronic [28,29]. In the low-temperature region (T < 390 K) the transport is attributed to being electronic because of the results of Mö ssbauer spectral analysis (Table 1), while in the high-temperature region (T > 390 K) CaO and BaO ions may become mobile and contribute to the conduction process, similar to that for some alkali-phosphate glasses containing iron [30].…”

Section: Conductivity and Activation Energymentioning

confidence: 99%

Electrical Conductivity in Mixed Calcium and Barium Iron Phosphate Glasses

El‐Desoky

Kashif

2002

phys. stat. sol. (a)

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The electrical properties of xCaO–(20 — x)BaO–20Fe2O3–60P2O5 glasses with x = 0, 5, 10, 15 and 20 mol% have been studied in the frequency range 400 Hz–200 kHz and over a temperature range 323–593 K. The ac conductivity as a function of temperature was divided into two domains, one where the absolute magnitude of the ac conductivity was close to the dc conductivity and another where it was larger than the dc conductivity. At the same temperature, the dc conductivity varied only slightly in glasses with different CaO and BaO content. It is concluded that the conductivity in these mixed CaO and BaO iron phosphate glasses is electronic and depends upon the Fe2+/(Fe2+ + Fe3+) ratio. In the high‐temperature region above θD/2 (where θD is the Debye temperature) the Mott model of small polaron hopping (SPH) between nearest neighbours is consistent with the conductivity data, while at low temperature (below θD) the Greaves intermediate variable‐range hopping (VRH) model is found to be appropriate. The electrical conduction of the glasses is confirmed to be non‐adiabatic SPH. Mössbauer spectral analysis indicates the presence of both Fe2+ and Fe3+ ions.

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Section: Conductivity and Activation Energymentioning

confidence: 99%

Electrical Conductivity in Mixed Calcium and Barium Iron Phosphate Glasses

El‐Desoky

Kashif

2002

phys. stat. sol. (a)

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Effect of Halide Ions on the Electronic Conductivity in Calcium Borate Glasses

Gohar¹,

Assem²,

Abuel‐ela³

1993

Cryst. Res. Technol.

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Some halogen-doped calcium borate glasses containing iron have been prepared according to the percentage molar composition [(30 -x) CaO . x CaX, . 10 Fe,O, .60 B,OJ and annealed. It is found that the conduction in the semiconducting glasses is mainly due to electronic conduction. The resultsshow that the halide ions may be introduced as modifiers for CaX, concentration < 10 mol% (X = F, C1, and Br) but they are network formers at CaX, > 10mol%. It is proposed that at 10mol% the network structure for all glasses seems to be the same. The dependence of resistivity on the halide ions concentration as well as the slight variation of activation energies, could be explained on the basis of electron-lattice interaction.Mathematical expressions for fitting and describing the dependence of resistivity on CaX, concentration are deduced and formulated by the following equations: e = eo exp [ kac(1 -bc)] and Q = elo exp [+a'c(l -b'c)] for the two regions around the critical concentration.

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7.3.0 Introduction

Burzo¹

Landolt-Börnstein - Group III Condensed Matter

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Electrical resistivity study of some lead-borate glasses

Cited by 10 publications

References 12 publications

Electrical Conductivity in Mixed Calcium and Barium Iron Phosphate Glasses

Electrical Conductivity in Mixed Calcium and Barium Iron Phosphate Glasses

Effect of Halide Ions on the Electronic Conductivity in Calcium Borate Glasses

7.3.0 Introduction

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