The IR spectra of the (CrxFe1−x)VO4 phases

Lavat, Araceli Elisabet; Grasselli, María Cristina; Baran, Enrique J.

doi:10.1016/0022-4596(89)90097-2

Cited by 15 publications

(6 citation statements)

References 9 publications

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“…It cannot be excluded that within this wave-number range the absorption bands are brought about also by bending vibrations of Al-O-V or by vibrations of a mixed character. [19,[53][54][55][56]58] …”

Section: Crystal Structure Of Alvomentioning

confidence: 99%

“…This band reflects stretching vibrations of the V-O bonds in the VO 4 tetrahedra. [17,19,[53][54][55][56] The second absorption band, lying over the wave-number range of 830 to 660 cm À1 with its absorption maxima at 814, 770, 747, and 722 cm À1 , has been ascribed to stretching vibrations of the Al-O bonds in the AlO 5 trigonal bipyramids [19,57] and of the shortest Al-O bond (0.176 nm) in the Al(1)O 6 octahedron. The third band exhibits its absorption maxima at 618, 588, 552, 536, and 522 cm À1 .…”

Section: Crystal Structure Of Alvomentioning

confidence: 99%

See 1 more Smart Citation

Phase Relations in the Al2O3-V2O5-MoO3 System in the Solid State. The Crystal Structure of AlVO4

Dąbrowska

Tabero

Kurzawa

2009

J. Phase Equilib. Diffus.

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Phase relations in the ternary oxide system Al 2 O 3 -V 2 O 5 -MoO 3 in the solid state in air have been investigated by using the x-ray diffraction (XRD) and differential thermal analysis/thermogravimetric (DTA/TG) methods. It was confirmed that in the subsolidus area of the Al 2 O 3 -V 2 O 5 -MoO 3 system, there exist seven phases, that is Al 2 O 3 , V 2 O 5(s.s.) , MoO 3 , AlVO 4 , Al 2 (MoO 4 ) 3 , AlVMoO 7 , and V 9 Mo 6 O 40 . Seven fields, in which particular phases coexist at equilibrium, were isolated. The crystal structure of AlVO 4 has been refined from x-ray powder diffraction data. Its space group is triclinic, P " 1, Z = 6, with a = 0.65323 (1) nm, b = 0.77498(2) nm, c = 0.91233(3) nm, a = 96.175(2)°, b = 107.234(3)°, c = 101.404(3)°, V = 0.42555 nm 3 . The crystal structure of the compound is isotypic with FeVO 4 . Infrared (IR) spectra of AlVO 4 and FeVO 4 are compared.

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Section: Crystal Structure Of Alvomentioning

confidence: 99%

Section: Crystal Structure Of Alvomentioning

confidence: 99%

Phase Relations in the Al2O3-V2O5-MoO3 System in the Solid State. The Crystal Structure of AlVO4

Dąbrowska

Tabero

Kurzawa

2009

J. Phase Equilib. Diffus.

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“…IR spectrum of H-type phase (curve a) is very similar to IR spectra of the other phases with such structure [21,22]. According to the literature data relating to the H-type phase structure [10], the absorption bands recorded in the wave-number range 1,070-540 cm -1 can be most likely ascribed to stretching vibrations of the V-O bonds in the VO 4 tetrahedra [23][24][25]. The absorption bands located in the remaining wavenumber range can be due to the stretching vibrations of M-O bonds in the FeO 6 [27].…”

Section: Resultsmentioning

confidence: 57%

Phases in the subsolidus area of the system CuO–V2O5–Fe2O3

Blonska-Tabero

2012

J Therm Anal Calorim

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The phase equilibria in the solid state in the system FeVO 4 -Cu 3 V 2 O 8 and FeVO 4 -CuO have been determined. Based on the obtained DTA and XRD analysis results and some additional research, a phase diagram in the whole subsolidus area of the system CuO-V 2 O 5 -Fe 2 O 3 has been worked out. Eighteen subsidiary subsystems can be distinguished in this ternary system. Basic properties of the obtained phases with howardevansite-and lyonsite-type structure have been investigated by DTA, IR, and SEM methods.

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“…Considering the fact, that the full structures of both compounds are unknown, univocal attribution of the recorded absorption bands to the concrete vibrations is not possible. However, in the light of the literature data [28][29][30][31][32][33][34], probable attribution can be made. The intensive absorption bands recorded in the wave number range about 1,050-630 cm -1 , with a big probability, can be ascribed to stretching vibrations of V-O bonds in VO 4 or/and in VO 5 polyhedra, first maximum of this band being due to stretching vibrations of the shortest V-O bond.…”

Section: Thermal Stability Of Lead(ii) Oxidementioning

confidence: 99%