Electrical Conduction of Glasses in the System Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;-Sb&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;-TeO&lt;sub&gt;2&lt;/sub&gt;

Qiu, Hong-Hua; Mori, Hayato; Sakata, H.; Hirayama, Toru

doi:10.2109/jcersj.103.32

Cited by 25 publications

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“…Equation (9a) gives ln s ¼ ln s 0 --(W/kT). Therefore the slope of the plot of ln s against W at a fixed temperature should be --1/kT [42]. The experimental relation between ln s and W at T ¼ 473 K is shown in Fig.…”

Section: Conduction Mechanismmentioning

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: Conduction Mechanismmentioning

confidence: 99%

Electrical Conductivity in Mixed Calcium and Barium Iron Phosphate Glasses

El‐Desoky

Kashif

2002

phys. stat. sol. (a)

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“…a tunneling probability e À2aR ¼ 1 is possible. This has already been shown to be invalid for similar iron containing systems within the studied temperature interval [10][11][12][13][14][15]22,25,26]. In fact, the calculations carried out for the sub-system 16Na 2 O AE 10CaO AE (74 À y)SiO 2 AE yFe 2 O 3Àd show that the tunneling probability for this set of compositions is e À2aR $ 10 À9 -10 À6 , i.e.…”

Section: Resultsmentioning

confidence: 96%

“…The distances between the iron ions were calculated from the composition and the respective density, assuming a random distribution of the iron ions in the glass [21,22,25,26]. The values are summarized in Table 2, column 4.…”

Section: Resultsmentioning

confidence: 99%

“…The values are summarized in Table 2, column 4. Since from the literature survey, a non-adiabatic hopping of electrons may be assumed to be the model describing the conduction process in the present case [26], Eq.…”

Section: Resultsmentioning

confidence: 99%

“…The conductivity of phosphate, borate, vanadate and tellurite glasses and also of ternary silicate glasses containing transition metal ions has frequently been reported in the literature [10,[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Besides, the conductivity of glasses and glassy materials from the system PbO/SiO 2 / Fe 2 O 3 was studied [15].…”

Section: Introductionmentioning

confidence: 99%

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