Some features of the preparation, structure, and properties of BICUTIVOX

Buyanova, E. S.; Морозова, М. В.; Emel’yanova, Yu. V.; Mikhailovskaya, Z. A.; Петрова, С. А.; Захаров, Р. Г.; Tarakina, Nadezda V.; Zhukovskii, V. M.

doi:10.1134/s0036023611120291

Cited by 3 publications

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“…The second phase cannot be seen by XRD method. The similar situation was observed for BICUTIVOX samples [9] where the impurity phase was described as BIMEVOX composition with only one dopant. Its structure was described as tetragonal unit cell (Sp.gr.…”

Section: Results and Discussion Bifenbvox Powders And Ceramics Characsupporting

confidence: 64%

“…The final product Bi 4 V 2-x Fe x/2 Nb x/2 O 11-δ starts to appear also after 2 min of mechanical activation. Solid solutions formation goes through formation of BiVO 4 vanadate which is characteristic for BIMEVOX solid solutions synthesis [9,[15][16][17]. The γ-phase of BIFENBVOX is formed after 8 min of mechanical treatment and is totally crystallized after additional 3-h annealing at 873 K. Figure 3 shows the evolution of the Xr a y p a t t e r n s o f m e c h a n o c h e m i c a l s y n t h e s i s o f Bi 4 V 1.7 Fe 0.15 Nb 0.15 O 11-δ in steps for different times of treatment.…”

Section: Results and Discussion Bifenbvox Powders And Ceramics Characmentioning

confidence: 99%

“…But at the same time, inserting of titanium atoms into the solid solution crystal lattice is random and is accompanied by formation of non-controlled micro-impurities of phases enriched by titanium. Moreover, prolong stability of BICUTIVOX γ-modification is impossible as it was shown by long-term annealing at heating-cooling cycles [9].…”

Section: Introductionmentioning

confidence: 99%

“…Electrical conductivity was estimated by means of impedance spectroscopy method. For the sample synthesized by hot compression method, the conductivity was equal to 7×10 −2 Ω −1 cm −1 at 773 K. Authors [7][8][9][10] showed that solid solution BICUTIVOX (Bi 4 V 2-x Cu x/2 Ti x/ 2 O 11-δ ) is formed by simultaneous doping of vanadium sublattice by copper and titanium and is crystallized in tetragonal γ-modification only at 0.25 ≤х≤ 0.30 (Sp.gr. I4/mmm).…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, structure, and properties of BIFENBVOX

Buyanova

Морозова

Emel’yanova

et al. 2015

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Solid solutions Bi 4 V 2-x Fe x/2 Nb x/2 O 11-δ (х=0.05-1.0) and Bi 4 V 2-х-y Fe x Nb y O 11-δ (with fixed x or y=0.2 and variable х or y=0.2-0.5 with step 0.1) were synthesized by the standard ceramic technology in the temperature range 773-1113 K and by mechanochemical activation method using Bi 2 O 3 , V 2 O 5 Fe 2 O 3 , and Nb 2 O 5 oxides as initial compounds. The formation of solid solutions was studied. Ranges of stability and temperature values of phase transitions for different polymorphous modifications were defined using dylatometric and thermo gravimetric studies. The morphology and the local chemical composition of the ceramic samples were studied. Samples with concentration of dopants x>0.3 contain two phases; both major and impurity phases are solid solutions of the BIFENBVOX type although the dopants atoms distribution between them is random. The thermal expansion coefficients (TEC) were measured. The electrical conductivity of ceramic samples was investigated in a wide range of temperatures. The highest conductivity values among the studied solid solutions are observed for the sample with a small amount of dopants x=0.25.

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Section: Results and Discussion Bifenbvox Powders And Ceramics Characsupporting

confidence: 64%