Phase-formation in the Y-Te-Ba-Cu-O system

Dimitriev, Y.; Ivanova, Y.; Gattef, E.; Kashchieva, E.; Vlahov, E.; Dimitrov, V.; Staneva, A.

doi:10.1007/bf00728043

Cited by 10 publications

(8 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…36-0288) through ion exchange. Furthermore, the tetragonal Bi 2 SiO 5 phase which has been reported to be a metastable phase 9 is easy to transform into a more stable phase. At the same time, less clear lattice fringes of the nanoparticles embedded in the surrounding sheets can be seen in Fig.…”

Section: Resultsmentioning

confidence: 99%

A superior photocatalytic performance of a novel Bi₂SiO₅flower-like microsphere via a phase junction

et al. 2014

View full text Add to dashboard Cite

A phase junction over a Bi(2)SiO(5) photocatalyst with the orthorhombic Bi(2)SiO(5) and the tetragonal Bi(2)SiO(5) structure was successfully synthesized via an ion exchange method using BiOBr solid microspheres as the sacrificial template. In the meantime, the as-prepared Bi(2)SiO(5) phase junction possesses a novel morphology of a flower-like microsphere with nanoparticles evenly embedded in its nano-petals. It was found that the Bi(2)SiO(5) phase junction not only showed a highly enhanced photocatalytic activity and excellent durability under UV or simulated solar irradiation, but also showed a remarkable visible-light activity for photo-degradation of phenol. Experimental results reveal that the tetragonal Bi(2)SiO(5) phase in this phase junction possesses a narrower band gap, thus leading to its extended light absorption. The efficient charge separation via a phase junction would make a great contribution to its highly enhanced photocatalytic activity under UV or simulated solar irradiation. The high efficiency in the degradation of organic pollutants makes the as-prepared photocatalyst a promising candidate for photocatalytic environmental purification.

show abstract

Section: Resultsmentioning

confidence: 99%

A superior photocatalytic performance of a novel Bi₂SiO₅flower-like microsphere via a phase junction

et al. 2014

View full text Add to dashboard Cite

show abstract

“…The increase of the measured characteristic temperatures and the calculated thermal stability in such glasses may be attributed to the ongoing replacement of the weak O─V─O bonds by the strong O─As─O ones. [9,60,61] On the other hand, this may reflect the steady Water groups [37,38] From 3000 to 2000 ─OH groups [48,49,50] Around 1772 H─O─H bending [36,48] At 1620 and 1640 Stretching vibration of H─O bond [39] Around 1445 Non-bridging oxygen anions of the form ─V─O À [51] From 1110 to 1060 Symmetric stretching vibrations of AsO 3 units [44,45,52,53] At about 1020 Vibrations of the VO 2groups of the VO 5 group [39] At about 1000 V─O─As common vibrations [54] From 990 to 940 Vibrations of VO 2groups of the VO 4 polyhedra [55] At about 790 Doubly degenerated stretching vibrations of AsO 3 groups [44,45] At about 613 Symmetric bending vibrations of AsO 3 groups due to FeO 4 tetrahedra, [1] this suggests that a vibration of As─O─Fe linkages may be exist…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

“…Bending vibrations of V─O─V chains [54] At around 543 Vibration of FeO 4 groups, some iron ions occupy the NWF positions [46,47] At about 509 Doubly degenerated bending vibrations of AsO 3 groups [44,45] At around 460 Band assigned to V 2 O 5 [49] At around 410 V─O─V linkages between vanadate layers and chains, in addition to the presence of some iron ions in the octahedral coordination state (FeO 6 ) which means that some iron occupy the NWM positions [47]…”

Section: At About 595mentioning

confidence: 99%

Thermal Kinetics and Theoretical Third Order Nonlinear Optical Susceptibility of some As₂ O₃ .V₂ O₅ .FeO Glasses

Ahmed

El-Ghamaz

Edres³

2018

Phys. Status Solidi A

View full text Add to dashboard Cite

A series of glasses having the composition x%As2O3·(80−x)%V2O5·20%FeO with (25 ≤ x ≤ 45) is prepared by the melt quenching technique. Complete amorphous nature of the glasses is confirmed from the XRD results. The density values are found to increase with increasing the concentration of the As2O3 in the samples, while the molar volume and the oxygen ion density values decrease with increasing the ratios of the As2O3 in the samples. The calculated values of optical basicity decreases with increasing the %As2O3 in the glasses, and the refractive index of the studied glasses is found to be around 1.8. The calculated average single bond strength values suggest that the ionic character is dominant between the bonds formed in the glass structure. The investigated glasses are probably good candidates for nonlinear optical applications as confirmed from the electronic polarizability and 3rd order nonlinear susceptibility χ(3) calculations. Several types of bonds and groups formed within the glass matrix are investigated and confirmed from the FTIR spectroscopy measurement. Thermal characteristics and glass stability are investigated by the DSC measurement. Activation energy for glass transition and crystallization as well as many other kinetic characteristics are studied.

show abstract

“…So, the number of network forming BiO 3 pyramidal units are maximum for glass sample with x = 0 and then goes on decreasing with increase in MnO 2 content, whereas the network modifying octahedral units are maximum for glass composition with x = 20. The IR peaks observed between 954 and 1000 cm À1 in all studied glass samples, may be assigned to Si-O-Si asymmetric vibrations of SiO 4 tetrahedra in polymerized network [28]. The appearance of IR absorption peak between 1111 and 1118 cm À1 for all compositions may be attributed to the linkage vibration of Bi-O-Si, Bi-O-Bi and/or Bi-O-Mn [25].…”

Section: Ftir Spectramentioning

confidence: 93%

Manganese modified structural and optical properties of bismuth silicate glasses

Dult

Kundu

Berwal

et al. 2015

Journal of Molecular Structure

View full text Add to dashboard Cite

Phase-formation in the Y-Te-Ba-Cu-O system

Cited by 10 publications

References 12 publications

A superior photocatalytic performance of a novel Bi₂SiO₅flower-like microsphere via a phase junction

A superior photocatalytic performance of a novel Bi₂SiO₅flower-like microsphere via a phase junction

Thermal Kinetics and Theoretical Third Order Nonlinear Optical Susceptibility of some As₂ O₃ .V₂ O₅ .FeO Glasses

Manganese modified structural and optical properties of bismuth silicate glasses

Contact Info

Product

Resources

About

Phase-formation in the Y-Te-Ba-Cu-O system

Cited by 10 publications

References 12 publications

A superior photocatalytic performance of a novel Bi2SiO5flower-like microsphere via a phase junction

A superior photocatalytic performance of a novel Bi2SiO5flower-like microsphere via a phase junction

Thermal Kinetics and Theoretical Third Order Nonlinear Optical Susceptibility of some As2 O3 .V2 O5 .FeO Glasses

Manganese modified structural and optical properties of bismuth silicate glasses

Contact Info

Product

Resources

About

A superior photocatalytic performance of a novel Bi₂SiO₅flower-like microsphere via a phase junction

A superior photocatalytic performance of a novel Bi₂SiO₅flower-like microsphere via a phase junction

Thermal Kinetics and Theoretical Third Order Nonlinear Optical Susceptibility of some As₂ O₃ .V₂ O₅ .FeO Glasses