ChemInform Abstract: INFRARED SPECTRA OF THE HEXACHALCOGENOHYPODIPHOSPHATE MIXED CRYSTALS CO2-XNIXP2S6 AND NI2P2S6-XSEX

1984 ◽  
Vol 15 (2) ◽  
Author(s):  
G. KLICHE
Keyword(s):  
Infrared Spectra ◽  
Mixed Crystals

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.

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 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

Infrarotspektren der Hexachalkogenohypodiphosphat-Mischkristalle Ni2P2S6-xSex und Co2-xNixS6 / Infrared spectra of the hexachalcogenohypodiphosphate mixed crystals Co2-xNixP2S6 and Ni2P2S6-xSex

1983 ◽  
Vol 38 (10) ◽  
pp. 1133-1137 ◽  
Author(s):  
G. Kliche
Keyword(s):  
Infrared Spectroscopy ◽  
Infrared Spectra ◽  
Mixed Crystals ◽  
Frequency Shifts ◽  
X Ray ◽  
Cationic Substitution ◽  
Anionic Species

Abstract The hexachalcogenohypodiphosphate mixed crystals Co2-xNixP2S6 and Ni2P2S6-x Set have been prepared and characterized by x-ray powder methods and infrared spectroscopy. The spectra of the anionic substituted mixed crystals show the existence of mixed anionic species like e.g. P2S5Se or P2S4Se2. Cationic substitution leads to a one mode behaviour of the internal modes of the P2S6-units with different frequency shifts for the Eu and A2u modes and a two mode behaviour of the external modes. Attempts to prepare mixed crystals Co2P2S6-xSex failed; only small amounts of selenium can be detected in Co2P2S6.

Special features of first and second-order Raman and infrared spectra of GaS1−xSex mixed crystals

1986 ◽  
Vol 135 (2) ◽  
pp. K107-K112 ◽  
Author(s):  
N. M. Gasanly ◽  
N. N. Melnik ◽  
V. I. Tagirov ◽  
A. A. Yushin
Keyword(s):  
Infrared Spectra ◽  
Second Order ◽  
Mixed Crystals

A study of mixed crystals in the InPO4-InVO4 system and their infrared spectra

1985 ◽  
Vol 50 (7) ◽  
pp. 1465-1469 ◽  
Author(s):  
Bohumil Hájek ◽  
Alexander Muck ◽  
Eva Šantavá
Keyword(s):  
Infrared Spectra ◽  
Factor Group ◽  
Mixed Crystals ◽  
Crystal Symmetry ◽  
Group Approach ◽  
Orthorhombic System ◽  
Site Group

The crystal symmetry was studied for mixed crystals in the InPO4-InVO4 orthorhombic system. The infrared spectra were examined using the site group and factor group approach, and the Td → Cs → C2v correlation was found more appropriate than the Td → C2v → D2h correlation.

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