The infrared spectra of tetrahedral anions in mixed crystals

1984 ◽  
Vol 49 (8) ◽  
pp. 1756-1763 ◽  
Author(s):  
Bohumil Hájek ◽  
Olga Smrčková ◽  
Petr Záruba
Keyword(s):  
Infrared Spectra ◽  
Group Analysis ◽  
Mixed Crystals

Group Analysis of the infrared spectra of KClO4-KMnO4, KClO4-KBF4 and K2SO4-K2XO4 (where X is Se, Cr, Mn) mixed crystals was carried out. These systems form D2h16 orthorhombic substitution mixed crystals; the symmetry of the anion is Td. Analysis of the infrared spectra samples with sufficiently diluted studied anion revealed the expected decrease in symmetry to Cs symmetry.

Vibration spectra of mixed crystals Sc(PO4, VO4) and Y(PO4, VO4)

1982 ◽  
Vol 47 (4) ◽  
pp. 1176-1183 ◽  
Author(s):  
Alexander Muck ◽  
Olga Smrčková ◽  
Bohumil Hájek
Keyword(s):  
Infrared Spectra ◽  
Group Analysis ◽  
Point Of View ◽  
Mixed Crystals ◽  
Site Symmetry ◽  
Lattice Vibrations ◽  
Vibration Spectra ◽  
Space Group

Infrared spectra of mixed crystals Sc(PO4, VO4) and Y(PO4, VO4) have been studied from the point of view of group analysis. These systems form substitution mixed crystals in tetragonal space group D194h. The anions having proper symmetry Td or D2d in site symmetry D2d exhibit in spectra lowering of the site symmetry to effective C2 as a result of lattice vibrations of the type T(B2).

Infrared spectroscopic study of the YPO4-YCrO4 system

1985 ◽  
Vol 50 (10) ◽  
pp. 2139-2145
Author(s):  
Alexander Muck ◽  
Eva Šantavá ◽  
Bohumil Hájek
Keyword(s):  
Spectroscopic Study ◽  
Infrared Spectra ◽  
Point Of View ◽  
Mixed Crystals ◽  
Crystal Symmetry ◽  
Infrared Spectroscopic Study ◽  
X Ray Diffraction ◽  
X Ray ◽  
Infrared Spectroscopic ◽  
Diffraction Patterns

The infrared spectra and powder X-ray diffraction patterns of polycrystalline YPO4-YCrO4 samples are studied from the point of view of their crystal symmetry. Mixed crystals of the D4h19 symmetry are formed over the region of 0-30 mol.% YPO4 in YCrO4. The Td → D2d → D2 or C2v(GS eff) correlation is appropriate for both PO43- and CrO43- anions.

Infrared Spectra of Crystalline Acetic Acid, a Hydrogen-Bonded Polymer

1977 ◽  
Vol 31 (2) ◽  
pp. 110-115 ◽  
Author(s):  
P. F. Krause ◽  
J. E. Katon ◽  
J. M. Rogers ◽  
D. B. Phillips
Keyword(s):  
Hydrogen Bonding ◽  
Acetic Acid ◽  
Infrared Spectra ◽  
Group Analysis ◽  
Structural Models ◽  
Factor Group ◽  
Vibrational Modes ◽  
Cryogenic Temperatures ◽  
Polymeric Chains ◽  
Hydrogen Bonded

The polarized infrared spectra of crystalline acetic acid and two of its deuterated derivatives, CH3COOD and CD3COOD, have been recorded from 400 to 4000 cm−1 at cryogenic temperatures. The spectroscopic results have been interpreted on the basis of a factor group analysis based on two structural models: a crystallographic cell composed of four interacting monomer units some of whose vibrational modes are highly perturbed by hydrogen bonding and a unit cell composed of two noninteracting acetic acid chains. The results are discussed in terms of possible interactions between the hydrogen-bonded acetic acid polymeric chains.

Infrared Spectra of HCl–HBr Mixed Crystals

1958 ◽  
Vol 28 (2) ◽  
pp. 316-318 ◽  
Author(s):  
G. L. Hiebert ◽  
D. F. Hornig
Keyword(s):  
Infrared Spectra ◽  
Mixed Crystals

The Vibrational Spectra of VPO5 Crystal Phases and Related Glasses

1977 ◽  
Vol 31 (3) ◽  
pp. 230-236 ◽  
Author(s):  
R. N. Bhargava ◽  
R. A. Condrate
Keyword(s):  
Raman Spectra ◽  
Infrared Spectra ◽  
Vibrational Spectra ◽  
Rayleigh Scattering ◽  
Physical Adsorption ◽  
Group Analysis ◽  
Phosphate Glasses ◽  
Infrared And Raman Spectra ◽  
Vanadium Phosphate ◽  
Space Groups

Infrared and Raman spectra were measured and interpreted for two crystalline VPO5 phases (α- and β-VPO5) and several related vanadium phosphate glasses. The spectral results for the crystalline phases were consistent with those predicted by factor group analysis using the previously determined space groups. Empirical band assignments were made for the observed bands on the basis of the bands observed earlier for related phosphate and oxyvanadium compounds. Also, the band assignments made for the infrared spectra of the glasses were consistent with the assignments for crystalline V2O5 and the two crystalline VPO5 phases. No Raman spectra were observed for the glasses because processes involving adsorption and Rayleigh scattering dominated over Raman scattering. The infrared spectra of vanadium phosphate glasses with high P2O5 concentrations possessed many features resembling those observed in the infrared spectra of α-VPO5, suggesting similarities in the short range order for the two materials. Analyses of the vibrational spectra of hydrated α-VPO5 samples suggests that the water molecules are adsorbed in the interlamellar spaces of the crystals, complexing to vanadium ions. Initial steps in the hydration of vanadium phosphate glasses apparently involve physical adsorption of water on their surfaces. No water adsorption could be detected for β-VPO5 under normal conditions from its infrared and Raman spectra.

Infrared spectra of unannealed and of annealed Cu4(OH)6(NO3)2

1987 ◽  
Vol 65 (10) ◽  
pp. 2504-2508 ◽  
Author(s):  
Etalo A. Secco ◽  
Glen G. Worth
Keyword(s):  
Infrared Spectra ◽  
Group Analysis ◽  
Site Symmetry ◽  
Torsional Mode ◽  
Oh Groups ◽  
Distinct Individual ◽  
Striking Change ◽  
Bending Modes ◽  
Combination Bands ◽  
First Time

The infrared spectra over the range 4000–150 cm−1 of Cu4(OH)6(NO3)2 along with site group and factor group analysis are reported for the first time. The observed absorption frequencies associated with OH and NO3 modes show distinct individual spectral features in the unannealed and annealed Cu4(OH)6(NO3)2. Three distinct types of OH groups involving different degrees of H-bonding are evident. The multiple frequencies involving Cu—O—H bending modes further reflect the varying degrees of H-bonding and OH coupling in Cu(OH)4O2 and Cu(OH)5O entities paralleling their behavior in Cu4(OH)6SO4. The NO3 internal optic modes' activities, fundamentals along with overtones and combination bands, illustrate distinct interaction effects (OH and Cu) with respect to specific modes relative to halo-nitrates with same site symmetry. The presence of CuO in the sample after the anneal effected a striking change in ν3. The Cu—O, O—Cu—O, and OH torsional mode frequencies show consistent behavior with Cu4(OH)6SO4.

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