Nonlinear and linear impedance of bismuth vanadate ceramics and its relation to structural properties

The Influence of Thin Gold Electrodes on the High-Temperature Impedance of Oxide Glasses

“…Moreover, silver can evaporate even at low (573-623 K) temperature [21] and silver ions are mobile in many materials, therefore, it should be used only for measurements at a low-temperature range [22,23]. The second often-used metal is gold, which has been applied for high-temperature measurements [24][25][26][27], even up to a temperature of 873 K [15]. However, the application of gold electrodes also has its limitations, which are often ignored.…”

Mixed ionic–electronic conductivity and structural properties of strontium‐borate glass containing nanocrystallites of Bi2VO5.5

“…The 50BiV50SBO glass‐ceramic nanocomposite shows a rapid increase in electric permittivity above 652 K (Fig. b) which is close to the ferro‐paraelectric phase transition, characteristic for the BiV phase . Therefore this observed change may be due to the phase transition.…”

“…). Electrical properties suggest that some changes in the samples structure take place up to a temperature of 813 K, close to the endothermic process which may be correlated with the second β ↔ γ phase transition of BiV (in 814 K) .…”

“…Literature data shows that strontium‐borate glass exhibits rather low values of D.C. conductivity (an average order of magnitude of 10 −12 Scm −1 at 753 K with E A = 1.51 eV) and its conduction mechanism is due to oxygen vacancies . The BiV ceramic shows D.C. conductivity significantly higher than SBO glass (from an order of magnitude of 10 −4 Scm −1 at 913 K with E A = 1.27 eV to 10 −10 Scm −1 at 503 K with E A = 0.57 eV) .…”

“…One of ferroelectric ceramics which may be dispersed in a glass matrix is Bi 2 VO 5.5 (BiV) . This ceramic exhibits two first order phase transitions α ↔ β phase at 730 K and β ↔ γ phase at 835 K. All three main polymorphs of BiV contain oxygen ion vacancies in the V–O layers which give rise to the high ionic D.C. conductivity of an order of 10 −6 Ω −1 · cm −1 at 730 K and 10 −3 Ω −1 · cm −1 at 923 K .…”