Tellurium Vanadate Glasses: V4+colorimetric Measure and Its Effect on Conductivity

McDonald, Lisa; Siligardi, Cristina; Vacchi, Marco; Zieser, Adam; Affatigato, Mario

doi:10.3389/fmats.2020.00103

Cited by 10 publications

(5 citation statements)

References 17 publications

(20 reference statements)

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“…This ionic conductivity is due to the migration of non-bridging oxygen along the network-former chains 45 , 46 or to the ion hopping of oxygen vacancies 47 . In their rigid state, at room temperature, common glasses, such as flat glass or glassware, have a conductivity of about 10 -11 S/cm, which puts them in the category of insulators, but there are also semiconducting glasses with a conductivity of up to 10 −5 S/cm 48 . To compare the glasses in terms of electrical conductivity, the temperature at which the conductivity value is 10 -8 S/cm (10 -6 S/m) can be used as an indicator of the conductivity limit between dielectrics and semiconductors [18, https://spark.iop.org/conductivity-electrical ].…”

Section: Resultsmentioning

confidence: 99%

Obtaining and conductive properties of a vanadate-borate-phosphate glass

Eftimie,

Filip,

Danescu

et al. 2023

Sci Rep

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Vanadate glasses exhibit semiconducting property at certain temperatures. This work demonstrates the conductivity of the composition 45V2O5–25B2O3–30P2O5, which is a new glass in the vanadium-boron-phosphorus ternary system that expands the glass forming area reported in literature data. The glass was obtained through a classical melt-quenching technique. The structural composition of the obtained glass was revealed with Raman spectroscopy and the amorphous characteristic has been highlighted with X-ray diffraction. The characteristic temperatures and the thermal expansion coefficient were determined by dilatometry. Based on the experimental measurements of electrical resistance, mathematical calculations were performed, resulting in a conductivity of 2.04·10−6 S/cm at 125 °C, and an activation energy of 42.91 kJ/mol for this glass. Impedance spectroscopy in DC and AC at 100 V and 100 Hz to 2 MHz, respectively, showed a lower activation energy of about 0.166 eV and transition temperatures of 24 °C and 11 °C, respectively. These results were compared with those from the literature considering the temperatures at which the reported conductivities were measured. This glass has potential applications in electronic devices and temperature sensors.

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Section: Resultsmentioning

confidence: 99%

Obtaining and conductive properties of a vanadate-borate-phosphate glass

Eftimie,

Filip,

Danescu

et al. 2023

Sci Rep

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“…Similar behaviors related to the change of conduction process have been reported. The change of conduction mechanism has been detected for vanado-phosphate and vanado-tellurite glasses [ 4 , 32 , 33 ].…”

Section: Results and Analysismentioning

confidence: 99%

“…This kind of glass has been widely applied in industry in memory devices, micro-structured optical fibers, and switching due to its good semiconducting properties [ 1 , 2 , 3 ]. Recently, zinc-tellurite glass doped with heavy metal oxides has received great scientific interest due to the major role that such oxides play in improving optical and electrical properties of these glasses [ 4 , 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Mixed Ionic and Electronic Conduction in TeO2-ZnO-V2O5 Glasses towards Good Dielectric Features

et al. 2022

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The melt-quenching technique was used to synthesize tellurite glasses of the chemical composition 80TeO2-(20-x) ZnO-xV2O5. X-ray diffraction (XRD) patterns indicate the amorphous nature of the prepared glasses. Raman and FTIR measurements demonstrate a progressive substitution of the Te-O-Te linkages by the Te-O-V bridges and the formation of VO4 and VO5 units by a change of the vanadium coordination due to the higher number of oxygens incorporated by further addition of V2O5. The AC conductivity was investigated in the frequency range of 40 Hz to 107 Hz between 473 K to 573 K. A good coherence of the AC conductivity was found using a model correlating the barrier hopping (CPH) and the dominant conduction process changes from ionic to polaronic with the addition of V2O5. The dielectric constant exhibits high values in the range of lower and medium frequencies. Both variations of the electric modulus and the dielectric loss parameters with frequency and temperature showed a relaxation character mainly assigned to the vanadate phases. The electric modulus displays a non-Debye dielectric dispersion and a relaxation process. The present results open the door to future zinc-tellurite glasses-doped vanadium exploitation as a potential electrolyte-based material for solid-state batteries.

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“…[17] In glass structure detection, it was reported that Te as ½TeO 4 and ½TeO 3 , V as ½VO 4 and ½VO 5 structural units exist in the glass network, and the interconversion of these structural units are related to the doped concentration. [18][19][20] The changes of the above properties are closely related to the electronic energy levels and local structures of transition metal ions. [21] By changing the chemical composition of the glass, the local environment of the TM ions entering the glass network can be altered, resulting in inhomogeneity of the local ligand field.…”

Section: Introductionmentioning

confidence: 99%

“…[ 17 ] In glass structure detection, it was reported that

Te

false[{TeO}_{4} false]

and

false[{TeO}_{3} false], normalV

false[{VO}_{4} false]

and

false[{VO}_{5} false]

structural units exist in the glass network, and the interconversion of these structural units are related to the doped concentration. [ 18–20 ]…”

Section: Introductionmentioning

confidence: 99%

Investigations on the local structure and the spin Hamiltonian parameters for Cu²⁺ in xCuO−(68−x)V₂O₅−32TeO₂ glasses

Liu

Yang

et al. 2022

Magnetic Reson in Chemistry

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The defect structure, spin Hamiltonian parameters (SHPs: anisotropic g factors g k and g ⊥ and the hyperfine structure constants A k and A ⊥ ), and their compositional dependence of Cu 2þ in xCuO À ð68 À xÞV 2 O 5 À 32TeO 2 (x = 5, 10, 20, 30 mol%) glasses are quantitatively analyzed by using the higher-order perturbation formula of octahedral complex with tetrahedral elongation distortion. Due to the Jahn-Teller effect, the ½CuO 6 10À group is subjected to tetragonal elongation distortion of varying degrees. D q , N, ρ, κ, and H show nonlinear changes with the concentrations of Cu 2þ . When x = 10 mol% CuO, the degree of distortion (ρ ≈ 0:1%) is the smallest; when x = 30 mol% CuO, the degree of distortion (ρ ≈ 15%) is the largest, which indicates that excessive distortion leads to the appearance of Z-axis oxygen vacancies and the coordination number of copper ions from six to four. The increasing tendency of the evaluated N and H reveals decreasing covalency of the whole glass system. Present theoretical studies would be useful to the explore the structural properties and optical applications of glass with different CuO concentrations. K E Y W O R D Selectron paramagnetic resonance, local structure, xCuO À ð68 À xÞV 2 O 5 À 32TeO 2 (x = 5, 10, 20, 30 mol%)

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Tellurium Vanadate Glasses: V4+colorimetric Measure and Its Effect on Conductivity

Cited by 10 publications

References 17 publications

Obtaining and conductive properties of a vanadate-borate-phosphate glass

Obtaining and conductive properties of a vanadate-borate-phosphate glass

Mixed Ionic and Electronic Conduction in TeO2-ZnO-V2O5 Glasses towards Good Dielectric Features

Investigations on the local structure and the spin Hamiltonian parameters for Cu²⁺ in xCuO−(68−x)V₂O₅−32TeO₂ glasses

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Tellurium Vanadate Glasses: V4+colorimetric Measure and Its Effect on Conductivity

Cited by 10 publications

References 17 publications

Obtaining and conductive properties of a vanadate-borate-phosphate glass

Obtaining and conductive properties of a vanadate-borate-phosphate glass

Mixed Ionic and Electronic Conduction in TeO2-ZnO-V2O5 Glasses towards Good Dielectric Features

Investigations on the local structure and the spin Hamiltonian parameters for Cu2+ in xCuO−(68−x)V2O5−32TeO2 glasses

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Investigations on the local structure and the spin Hamiltonian parameters for Cu²⁺ in xCuO−(68−x)V₂O₅−32TeO₂ glasses