Mixed ionic–electronic conductivity and structural properties of strontium‐borate glass containing nanocrystallites of Bi₂VO_5.5

Abstract

Samples of strontium borate glass containing bismuth vanadate nanocrystallites were prepared. Nanocomposites containing up to 45 mol% of the Bi2VO5.5 phase exhibit electrical properties closer to the strontium‐borate glass than to the ferroelectric Bi2VO5.5 ceramic. The glass matrix still may contain some part of bismuth and vanadium ions even after crystallization process and there is too little of crystalline phase to observe its ferroelectric properties. The glass‐ceramic nanocomposite containing 50 mol% of Bi2VO5.5 phase exhibits electrical properties closer to the Bi2VO5.5 ferroelectric. The electric parameters of conduction processes in the Bi2VO5.5 nanocrystallites, glass matrix and phases boundaries are discussed. The conduction process mechanism in all nanocomposites for the low temperatures is mixed ionic–electronic and in the higher temperatures the oxygen ion hopping starts to dominate.

Tunable Dielectric Switching of (Quinuclidinium)[MnCl4] Hybrid Compounds

“…35 The beginning of the third process visible at a low-frequency range and high temperatures can be correlated with electrode effects. 37 The relaxation properties of QMnCl are discussed based on the complex electrical modulus (M* = M′ + iM″) examination. A typical behavior for the relaxation process of the temperature dependence of the imaginary part of the electrical modulus (M″) recorded at various temperatures for QMnCl is exposed (SI, Figure S11).…”

“…Two conduction processes are correlated with proton transfer in Q and Cl – ion transfer . The beginning of the third process visible at a low-frequency range and high temperatures can be correlated with electrode effects . The relaxation properties of QMnCl are discussed based on the complex electrical modulus ( M * = M ′ + iM ″) examination.…”

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

“…Ec is the activation energy for electrical conductivity, expressed in J/mol. Considering the articles of other authors 4 , 10 , 44 – 47 , some vanadate and phosphate-tellurite glasses can exhibit also ionic conductivity in addition to the much more important electronic conductivity. 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 .…”

“…Considering the articles of other authors 4 , 10 , 44 – 47 , some vanadate and phosphate-tellurite glasses can exhibit also ionic conductivity in addition to the much more important electronic conductivity. 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 .…”

Mechanochemical Synthesis of Bi2VO5.5 for Improved Photocatalytic Dye Degradation

“…In context of BiV‐650, we find the presence of secondary peak formation of V 3 O 5 , V 2 O 3 , V 2 O 4, and Bi 2 O 3 at 18.8°, 24.2°, 26.8°, and 27.9° respectively apart from Bi 2 VO 5.5 phase. MBM method produced fine particles which assisted in synthesizing Bi 2 VO 5.5 single phase viable at 650 °C within 5 h, so this work produces Bi 2 VO 5.5 single phase at lessening synthesis time than the reported 24 h annealing at 1020 K. [ 38 ] The powder through the mortar pestle grinding method could not be synthesized at 650 °C within 5 h giving an additional phase, so we intend to discard the BiV‐650 powdered sample in our further experimental investigations.…”