Vibrational Raman Scattering from high TC single Crystals

1987 ◽  
Vol 99 ◽  
Author(s):  
D. M. Krol ◽  
M. Stavola ◽  
L. F. Schneemeyer ◽  
J. V. Waszczak ◽  
W. Weber
Keyword(s):  
Chemical Composition ◽  
Raman Scattering ◽  
Single Crystals ◽  
Raman Spectra ◽  
Peak Position ◽  
High Tc ◽  
Stretching Vibration ◽  
Polarized Raman ◽  
Axial Stretching

ABSTRACTPolarized Raman spectra have been measured on single crystals of the high Tc materials A2BCu3Ox with A=Ba and Sr, B=Y and La and 6<x<7. The dependence of the 500 cm-i peak position (αzz)on chemical composition is in agreement with its assignment to the O(1) axial stretching vibration. The intensity of the 600 cm1 band, which has been ascribed to a defect induced Cu-O mode, strongly depends on the crystal preparation and resulting purity.

Polarized Raman Scattering Study of ZnGeP2 Single Crystals

1997 ◽  
Vol 484 ◽  
Author(s):  
Spirit Tlali ◽  
Howard E. Jackson ◽  
M. C. Ohmer ◽  
P. G. Schunemann ◽  
T. M. Pollak
Keyword(s):  
Raman Scattering ◽  
Single Crystals ◽  
Raman Spectra ◽  
Low Temperatures ◽  
High Quality ◽  
Crystal Orientations ◽  
Gradient Technique ◽  
Theoretical Predictions ◽  
Scattering Study ◽  
Polarized Raman

AbstractRaman scattering experiments on high quality ZnGeP2 single crystals grown by the seeded horizontal dynamic gradient technique have been carried out. Polarized Raman spectra were obtained in the backscattering geometry at both room and low temperatures for several crystal orientations and compared with group theoretical predictions. Raman spectra from as-grown and annealed samples display distinctive differences which were explored by utilizing two different excitation wavelengths: 514.3 nm and 632.8 nm; the observed differences are attributed to a surface interdiffuasion effect.

Some New 1-D Compounds with Metal-Halide Chain

1981 ◽  
Vol 36 (1) ◽  
pp. 83-86 ◽  
Author(s):  
D. Layek ◽  
G. C. Papavassiliou
Keyword(s):  
Single Crystals ◽  
Raman Spectra ◽  
Mixed Valence ◽  
Metal Halide ◽  
Anisotropic Character ◽  
Chemical Behaviour ◽  
Polarized Raman ◽  
Mixed Valence Compounds

Abstract Some new mixed valence compounds of the type [M(L-L)2M(L-L)2X2]Y4 (where M = Pt or Pd, L-L = 2NH3 or ethylenediamine, X = Cl, Br or I and Y = HSO4, 1/2 SO4, ClO4 or 1/2 PtCl4) have been synthesized. The polarized Raman spectra of single crystals show the anisotropic character and the presence of ---M(II)---X-M(IV)-X chains. The method of preparation and the chemical behaviour correspond to the mechanism of the formation of Magnus green salt oxidized product.

scholarly journals Micro-Raman Spectroscopy Assessment of Chemical Compounds of Mantle Clinopyroxenes

Minerals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1084
Author(s):  
Anastasiya D. Kalugina ◽  
Dmitry A. Zedgenizov
Keyword(s):  
Raman Spectroscopy ◽  
Chemical Composition ◽  
Chemical Compounds ◽  
Peak Position ◽  
Mantle Xenoliths ◽  
Wide Range ◽  
Stretching Vibration ◽  
Raman Modes ◽  
Non Destructive ◽  
Heterovalent Isomorphism

The composition of clinopyroxenes is indicative for chemical and physical properties of mantle substrates. In this study, we present the results of Raman spectroscopy examination of clinopyroxene inclusions in natural diamonds (n = 51) and clinopyroxenes from mantle xenoliths of peridotites and eclogites from kimberlites (n = 28). The chemical composition of studied clinopyroxenes shows wide variations indicating their origin in different mantle lithologies. All clinopyroxenes have intense Raman modes corresponding to metal-oxygen translation (~300–500 cm−1), stretching vibrations of bridging O-Si-Obr (ν11~670 cm−1), and nonbridging atoms O-Si-Onbr (ν16~1000 cm−1). The peak position of the stretching vibration mode (ν11) for the studied clinopyroxenes varies in a wide range (23 cm−1) and generally correlates with their chemical composition and reflects the diopside-jadeite heterovalent isomorphism. These correlations may be used for rough estimation of these compounds using the non-destructive Raman spectroscopy technique.

Identification of hydrogen bond modes in polarized Raman spectra of single crystals of α-oxalic acid dihydrate

2009 ◽  
Vol 40 (11) ◽  
pp. 1605-1614 ◽  
Author(s):  
Vlasta Mohaček-Grošev ◽  
Jože Grdadolnik ◽  
Jernej Stare ◽  
Dušan Hadži
Keyword(s):  
Hydrogen Bond ◽  
Oxalic Acid ◽  
Single Crystals ◽  
Raman Spectra ◽  
Oxalic Acid Dihydrate ◽  
Polarized Raman

CdZnSe/Zn(Be)Se Quantum Dot Structures: Size, Chemical Composition and Phonons

2003 ◽  
Vol 799 ◽  
Author(s):  
Y. Gu ◽  
Igor L. Kuskovsky ◽  
J. Fung ◽  
R. Robinson ◽  
I. P. Herman ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Chemical Composition ◽  
Quantum Dot ◽  
Raman Scattering ◽  
Size Effect ◽  
Quantum Size Effect ◽  
Optically Active ◽  
Photoluminescence Excitation ◽  
Quantum Size ◽  
Polarized Raman

ABSTRACTThe size and chemical composition of optically active CdZnSe/ZnSe and CdZnSe/Zn0.97Be0.03Se quantum dots (QDs) are determined using photoluminescence, photoluminescence excitation and polarized Raman scattering spectroscopies. We show that the addition of Be into the barrier enhances the Cd composition and the quantum size effect of optically active QDs. Additionally, surface phonons from QDs are observed in CdZnSe/ZnBeSe nanostructures.

Polarized Raman spectra of superconducting and semiconducting YBa2Cu3Ox single crystals

1988 ◽  
Vol 153-155 ◽  
pp. 290-291 ◽  
Author(s):  
V.G. Hadjiev ◽  
M.N. Iliev ◽  
P.G. Vassilev
Keyword(s):  
Single Crystals ◽  
Raman Spectra ◽  
Polarized Raman

ChemInform Abstract: POLARIZED RAMAN SPECTRA OF (NH4)2SO4 SINGLE CRYSTALS

1974 ◽  
Vol 5 (34) ◽  
Author(s):  
KATSUO UCHIDA ◽  
HIROAKI TAKAHASHI ◽  
KENITI HIGASI
Keyword(s):  
Single Crystals ◽  
Raman Spectra ◽  
Polarized Raman

Polarized Raman scattering of impurity modes in beryllium-doped cubic boron nitride single crystals

2003 ◽  
Vol 82 (18) ◽  
pp. 2972-2974 ◽  
Author(s):  
Kenji Watanabe ◽  
Takashi Taniguchi ◽  
Hisao Kanda ◽  
Elena M. Shishonok
Keyword(s):  
Boron Nitride ◽  
Raman Scattering ◽  
Single Crystals ◽  
Cubic Boron Nitride ◽  
Impurity Modes ◽  
Polarized Raman
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