Hydrostatic pressure-induced phase transitions in RbMnCl3: Raman spectra and lattice dynamics

ABSTRACTWe report results from a Raman scattering study of stage 2 Graphite-Rb and Graphite-K in the low frequency region (ω < 150 cm-1) as a function of temperature (80K < T < 300K). Four features are seen in the 80K spectra and are interpreted in terms of a Born– von Kármán lattice dynamics model. The temperature-dependence of the Raman spectra is discussed in connection with reported phase transitions in stage 2 alkalimetal graphite compounds.

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Pressure-Induced Phase Transitions in ScF 3 Crystal--Raman Spectra and Lattice Dynamics

Ferroelectrics ◽

10.1080/00150190390204691 ◽

2003 ◽

Vol 284 (1) ◽

pp. 31-45 ◽

Cited By ~ 6

Author(s):

K. S. Aleksandrov ◽

V. N. Voronov ◽

A. N. Vtyurin ◽

S. A. Goryainov ◽

N. G. Zamkova ◽

...

Keyword(s):

Phase Transitions ◽

Raman Spectra ◽

Lattice Dynamics

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Effects of hydrostatic pressure on the molecular structure and endothermic phase transitions of phosphatidylcholine bilayers: a Raman scattering study

Biochemistry ◽

10.1021/bi00336a043 ◽

1985 ◽

Vol 24 (15) ◽

pp. 4091-4096 ◽

Cited By ~ 56

Author(s):

P. T. T. Wong ◽

H. H. Mantsch

Keyword(s):

Molecular Structure ◽

Phase Transitions ◽

Hydrostatic Pressure ◽

Raman Scattering ◽

Scattering Study

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NQR study of the structural phase transitions in a system with reduced effective dimensionality: K2ReCl6

Canadian Journal of Physics ◽

10.1139/p83-176 ◽

1983 ◽

Vol 61 (10) ◽

pp. 1374-1381 ◽

Cited By ~ 10

Author(s):

Marie D'Iorio ◽

Robin L. Armstrong

Keyword(s):

Fourier Transform ◽

Phase Transitions ◽

Hydrostatic Pressure ◽

Magnetic Resonance ◽

Structural Phase ◽

Nonlinear Phenomena ◽

Structural Phase Transitions ◽

Quadrupole Resonance ◽

Nuclear Quadrupole ◽

Effective Dimensionality

Chlorine 35 nuclear quadrupole resonance (NQR) frequency and lineshape data, obtained with a Fourier transform magnetic resonance spectrometer, are presented for the antifluorite crystal K2ReCl6. In the temperature range investigated, 85 to 130 K, two structural phase transitions occur which reduce the crystal symmetry from cubic to tetragonal to monoclinic. The variation of the NQR spectrum with temperature and with hydrostatic pressure up to 2.64 kbar is documented. The structure of the spectrum and the intensity distribution within it are unexpected from previous studies of antifluorite systems. An explanation of the results is given which is based on recent discussions of nonlinear phenomena at phase transitions in crystals exhibiting reduced effective dimensionality.

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Raman spectra and lattice dynamics of the α phases of nitrogen and carbon monoxide crystals

Canadian Journal of Physics ◽

10.1139/p70-284 ◽

1970 ◽

Vol 48 (19) ◽

pp. 2265-2271 ◽

Cited By ~ 117

Author(s):

A. Anderson ◽

T. S. Sun ◽

M. C. A. Donkersloot

Keyword(s):

Carbon Monoxide ◽

Raman Spectra ◽

Lattice Dynamics ◽

Jones Potential ◽

Lennard Jones ◽

Neon Laser ◽

Helium Neon Laser ◽

First Time ◽

Helium Neon ◽

Argon Ion

The Raman spectra of polycrystalline α-nitrogen and α-carbon monoxide have been recorded at 18 °K, using argon–ion and helium–neon laser excitation. Previously undetected peaks at 60 cm−1 for N2 and 90.5 cm−1 for CO are assigned as librational modes, and splitting of the stretching mode in nitrogen is observed for the first time. Spectral features in both the intramolecular and lattice regions are assigned in accordance with accepted crystal structures, and their frequencies compared with those obtained from calculations based on a spherical Lennard–Jones potential and quadrupole–quadrupole interactions between the molecules.

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