DC conduvtivity of V2O5TeO2 glasses

Dhawan, Vibha; Mansingh, Abhai; Sayer, M.

doi:10.1016/0022-3093(82)90190-9

Cited by 194 publications

(77 citation statements)

References 21 publications

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“…The large variations of the electronic conductivity with the concentration of the transition metal oxide are surely related to the exponential decay of the overlapping term because the mean jump distance is function of the concentration if a random distribution of the vanadium atoms in the matrix is assumed. For example, molar variation in V205 of 10 % leads to about one unit log variation in the conductivity for P205 and V205-TeO2 glasses [18,20]. The high sensibility of the ionic conductivity with the alkali content is very usual and can be interpreted by large variations in the concentration of the ionic charge carriers when the thermodynamic activity of the alkali oxide changes [21].…”

Section: Intermediate Compositions : Mixed Conductivity ?mentioning

confidence: 96%

Mixed conductivity of glasses in the P2O5-V2O5-Na2O system

Ungureanu¹,

Lévy

Souquet

1998

Ionics

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Abstract. The conductivity of glasses in the P2Os-[(1-x) V205 -X Na20] system is studied as a function of temperature and composition. For all compositions, the conductivity variations as a function of temperature follow an Arrhenius type relationship: cy= A---exp(-~za ].T \ RTJ The activation energies and pre-exponential factors corresponding to the V205 richest compositions are lower than that corresponding to the ionic ones. Isothermal variations of the conductivity as a function of composition show a deep minimum for a molar ratio x near 0.65. On either side of this minimum, the conductivity is mainly electronic (x < 0.7) or ionic (x > 0.8). The variations are interpreted assuming a prevailing diluting effect of the non predominantly present oxide without any interactions between the electronic and ionic charge carriers.

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Section: Intermediate Compositions : Mixed Conductivity ?mentioning

confidence: 96%

Mixed conductivity of glasses in the P2O5-V2O5-Na2O system

Ungureanu¹,

Lévy

Souquet

1998

Ionics

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“…Electrical transport properties of transition metal ion oxide glasses have been studied by different research workers [1][2][3][4][5][6][7][8]. The electron-phonon interaction in these glasses is strong enough to form small polarons and the electrical conduction takes place by the hopping of small polarons from reduced to more oxidized ions.…”

Section: Introductionmentioning

confidence: 99%

Dielectric relaxation and ac conductivity of sodium tungsten phosphate glasses

2002

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Studies of dielectric relaxation and ac conductivity have been made on three samples of sodium tungsten phosphate glasses over a temperature range of 77-420 K. Complex relative permittivity data have been analyzed using dielectric modulus approach. Conductivity relaxation frequency increases with the increase of temperature. Activation energy for conductivity relaxation has also been evaluated. Measured ac conductivity´σ m´ω µµ has been found to be higher than σ dc at low temperatures whereas at high temperature σ m´ω µ becomes equal to σ dc at all frequencies. The ac conductivity obeys the relation σ ac´ω µ A ω S over a considerable range of low temperatures. Values of exponent S are nearly equal to unity at about 78 K and the values decrease non-linearly with the increase of temperature. Values of the number density of states at Fermi level´N´E F µµ have been evaluated at 80 K assuming values of electron wave function decay constant α to be 0.5 (Å) 1 . Values of N´E F µ have the order 10 20 which are well within the range suggested for localized states. Present values of N´E F µ are smaller than those for tungsten phosphate glasses.

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“…Oxide glasses including transition metal ions were extensively studied due to their semiconducting properties [1][2][3][4][5][6]. The conduction in ternary iron oxide glasses was confirmed to be due to hopping conduction of polaron [7].…”

Section: Introductionmentioning

confidence: 99%

“…The structural role of lead oxide in many oxide glasses is unique since lead oxide is known to play a dual role both as a network modifier and former [1,8,9]. This role depends on the type of bond between lead and oxide.…”

Section: Introductionmentioning

confidence: 99%