Study of polarization Raman spectra of natural thomsonite

1981 ◽  
Vol 46 (12) ◽  
pp. 3038-3042 ◽  
Author(s):  
František Pechar
Keyword(s):  
Single Crystal ◽  
Raman Spectra ◽  
Natural Zeolite ◽  
Room Temperature ◽  
Wavenumber Region

The polarization Raman spectra were measured for a single crystal of thomsonite, a natural zeolite. The spectra were scanned in the wavenumber region of 50-4 000 cm-1 at room temperature. The results are discussed in terms of the structure of the mineral under study.

scholarly journals Raman Spectra of 6LiRbSO4 and 7LiRbSO4

1993 ◽  
Vol 47 (7) ◽  
pp. 999-1006 ◽  
Author(s):  
Kyung Hui Oh ◽  
Joon Hyung Cho ◽  
Seung-Bin Kim
Keyword(s):  
Irreducible Representation ◽  
Single Crystal ◽  
Raman Spectra ◽  
Room Temperature ◽  
Lithium Ion ◽  
Lithium Isotope ◽  
Sulfate Ion ◽  
Vibrational Coupling ◽  
Coupling Interaction ◽  
Polarized Raman

The polarized Raman spectra of single-crystal 6LiRbSO4 and 7LiRbSO4 at room temperature are reported. On the basis of these data, symmetry-based band assignments are given for both internal and external optic modes. The translational optic modes of the lithium ion appear in the region between 444 and 364 cm−1. Vibrational coupling interactions are noted between the sulfate ion ν2 and the lithium translational optic modes in the same irreducible representation. Coupling interactions are negligible or small in 7LiRbSO4, while in 6LiRbSO4 the lithium isotope effect shifts the lithium translational modes into more coupling interaction with the sulfate ion ν2 modes.

Infrared spectra of the natural zeolite heulandite

1985 ◽  
Vol 50 (10) ◽  
pp. 2134-2138 ◽  
Author(s):  
František Pechar
Keyword(s):  
Absorption Spectra ◽  
Raman Spectra ◽  
Infrared Spectra ◽  
Natural Zeolite ◽  
Room Temperature ◽  
Far Infrared ◽  
Reflection Spectra ◽  
Mid Infrared

The mid-infrared (4 000-200 cm-1) absorption spectra, far infrared (400-40 cm-1) absorption spectra, infrared (1 400-200 cm-1) reflection spectra, and Raman spectra (3 600-50 cm-1) were measured at room temperature for polycrystalline heulandite, a natural zeolite from Poonah, India.

Laser Raman polarization spectra of natural zeolite-natrolite

1981 ◽  
Vol 46 (12) ◽  
pp. 3043-3048 ◽  
Author(s):  
František Pechar ◽  
Ivan Gregora ◽  
Drahoš Rykl
Keyword(s):  
Single Crystal ◽  
Crystal Lattice ◽  
Natural Zeolite ◽  
Room Temperature ◽  
Water Molecules ◽  
Laser Raman ◽  
Polarization Spectra ◽  
Internal Vibrations

Raman polarization spectra of single crystal of natrolite Na2Al2Si3O10.2 H2O have been measured in the region 4 000 to 50 cm-1 at room temperature. The spectra have been measured in the conventional rectangular geometry. The found maxima of the polarization spectra of single crystal of the mineral investigated can be divided into four groups according to pertinence to individual vibrations: (i) translation and rotation vibrations of water molecules in interaction with the crystal lattice, (ii) internal vibrations of the bonds Al-O, Si-O inside the tetrahedrons, (iii) internal vibrations of bonds of the water molecules, (iv) external vibrations between the (Al,Si)O4 tetrahedrons.

Raman and infrared spectral studies of polycrystalline thallium(I) halates, TIXO3

1977 ◽  
Vol 55 (18) ◽  
pp. 3218-3226 ◽  
Author(s):  
Arlen Viste ◽  
Donald E. Irish
Keyword(s):  
Single Crystal ◽  
Raman Spectra ◽  
Infrared Spectra ◽  
Vibrational Spectra ◽  
Room Temperature ◽  
Spectral Studies ◽  
Active Mode ◽  
Piezoelectric Crystals ◽  
Infrared Spectral ◽  
Molecular Unit

Raman and infrared spectra have been recorded for polycrystalline samples of TIClO3, TIBrO3, and T1IO3 at room temperature. The vibrational spectra of these rhombohedral (R3m, C3v5) crystals are closely related to each other, and to single crystal Raman spectra of isomorphous RbClO3 and KBrO3 reported by others. Spectral assignments are made. The uni-molecular unit cell yields no correlation field splitting, but lack of a center of inversion leads to TO/LO splitting of each active mode in these uniaxial piezoelectric crystals. Relationships between the thallium(I) halates and the NaN3 and MXY3 perovskite structures are considered.

Synthetic, Structural and Vibrational Spectroscopic Studies in Bismuth(III) Halide/N,N′-Aromatic Bidentate Base Systems. II Bipyridinium (2,2' Bipyridine) tetraholobismuthate (III) (Halogen = Chloride or Bromide)

1998 ◽  
Vol 51 (4) ◽  
pp. 311 ◽  
Author(s):  
Graham A. Bowmaker ◽  
Jack M. Harrowfield ◽  
Aaron M. Lee ◽  
Brian W. Skelton ◽  
Allan H. White
Keyword(s):  
Single Crystal ◽  
Raman Spectra ◽  
Room Temperature ◽  
Far Infrared ◽  
Spectroscopic Studies ◽  
Infrared And Raman Spectra ◽  
X Ray ◽  
Structure Determinations ◽  
Anionic Species

Syntheses and room-temperature single-crystal X-ray structure determinations are recorded for the title compounds, [bpyH]+[(bpy)BiX4]-, X = Cl, Br, the chloride being obtained in a second acetonitrile- sesquisolvated form. [bpyH]+[(bpy)BiX4]-, X = Cl, Br, are isomorphous, monoclinic C2/c, a ≈ 15·3, b ≈ 9·6, c ≈ 16·8 Å, β 109°, Z = 4, conventional R on |F| being 0·056, 0·059 for No 1456, 769 independent ‘observed’ (I > 3σ(I)) reflections respectively. [bpyH] [(bpy)BiCl4].1½MeCN is monoclinic, P21/m, a 9·572(2), b 34·521(8) c 8·218(2) Å, β 102·13(2)°, Z = 4, R 0·043 for No 2635. All anionic species are mononuclear, the bismuth being quasi-octahedral. Bands in the far-infrared and Raman spectra due to the vibrations of the N2BiCl4 core in [(bpy)BiCl4]- are assigned, and their relationship to the vibrations of [BiCl6]3- is discussed.

Syntheses, Structures and Vibrational Spectra of Some Dimethyl Sulfoxide Solvates of Bismuth(III) Bromide and Iodide

1998 ◽  
Vol 51 (4) ◽  
pp. 285 ◽  
Author(s):  
Graham A. Bowmaker ◽  
Jack M. Harrowfield ◽  
Peter C. Junk ◽  
Brian W. Skelton ◽  
Allan H. White
Keyword(s):  
Single Crystal ◽  
Dimethyl Sulfoxide ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Room Temperature ◽  
Far Infrared ◽  
Infrared And Raman Spectra ◽  
X Ray

Room-temperature single-crystal X-ray studies are recorded for some dimethyl sulfoxide (dmso) solvates of bismuth(III) bromide and iodide. Colourless BiBr3.3dmso is triclinic, P-1, a 8·467(4), b 9·109(4), c 13·901(4) Å, α 76·34(4), β 76·95(4), γ 64·56(4)°, Z = 2; conventional R on |F| was 0·050 for No 2306 independent ‘observed’ (I > 3σ(I)) reflections. The complex is mononuclear with a quasi-octahedral fac-bismuth environment, [(dmso-O)3BiBr3], isomorphous with the previously determined chloride. Orange BiI3-2dmso is triclinic, P-1, a 12·558(2), b 8·962(2), c 8·342(1) Å, α 61·85(1), β 78·27(1), γ 76·89(2)°, Z = 2 f.u., R 0·048 for No 1953. The complex is binuclear, a pair of iodide atoms bridging the two bismuth atoms, [(dmso-O)2I2Bi(µ-I)2BiI2(O-dmso)2]; the two O-dmso ligands about each six-coordinate bismuth lie trans. Red BiI3.2 ⅔ dmso is triclinic, P-1, a 16·435(6), b 14·926(2), c 12·396(3) Å, α 74·89(2), β 73·24(2), γ 79·18(2)°, Z = 6, R 0·059 for No 5858. The complex is [Bi(O-dmso)8] [Bi2I9], the eight-coordinate metal environment of the cation being, unusually, dodecahedral; in the anion a pair of quasi-octahedral six-coordinate bismuth atoms are bridged by three iodides, [I3Bi(µ-I)3BiI3]3-. Bands in the far-infrared and Raman spectra due to the v(BiX) modes are assigned and discussed in relation to the structures of the complexes. The assignment of the v(BiO) modes is discussed.

Raman spectra of sodium sulphamate single crystal

1983 ◽  
Vol 61 (9) ◽  
pp. 2048-2052 ◽  
Author(s):  
P. Muthusubramanian ◽  
A. Sundara Raj
Keyword(s):  
Hydrogen Bonding ◽  
Single Crystal ◽  
Single Crystals ◽  
Raman Spectra ◽  
Room Temperature ◽  
Polycrystalline Sample ◽  
Vibrational Assignments ◽  
Polarized Raman ◽  
Sulphamic Acid ◽  
Infrared Data

Vibrational assignments are proposed for solid NaNH2SO3 on the basis of room temperature polarized Raman spectra of single crystals. Infrared data for the region 4000–50 cm−1 of the polycrystalline sample are also presented. The results indicate that (1) there is no water of crystallization, (2) the hydrogen bonding is extremely weak, and (3) the strength of N—S bond is stronger than in sulphamic acid.

Mechanical Properties and Dislocation Structure of Single Crystal Cdte Deformed in Compression at 300°C

1976 ◽  
Vol 34 ◽  
pp. 592-593
Author(s):  
Ernest L. Hall ◽  
J. B. Vander Sande
Keyword(s):  
Mechanical Properties ◽  
Single Crystal ◽  
Dislocation Structure ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Strain Curve ◽  
Optical Devices ◽  
Semiconductor Compound ◽  
Wide Range ◽  
Sample Orientation

The present paper describes research on the mechanical properties and related dislocation structure of CdTe, a II-VI semiconductor compound with a wide range of uses in electrical and optical devices. At room temperature CdTe exhibits little plasticity and at the same time relatively low strength and hardness. The mechanical behavior of CdTe was examined at elevated temperatures with the goal of understanding plastic flow in this material and eventually improving the room temperature properties. Several samples of single crystal CdTe of identical size and crystallographic orientation were deformed in compression at 300°C to various levels of total strain. A resolved shear stress vs. compressive glide strain curve (Figure la) was derived from the results of the tests and the knowledge of the sample orientation.

Single Crystal Raman Spectra of the Phase Transition in KTCNQ

1982 ◽  
Vol 85 (1) ◽  
pp. 297-303 ◽  
Author(s):  
A. D. Bandrauk ◽  
K. D. Truong ◽  
S. Jandl
Keyword(s):  
Phase Transition ◽  
Single Crystal ◽  
Raman Spectra
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