Piezospectroscopic Study of the Raman Spectrum of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>-Quartz

Tekippe, V. J.; Ramdas, A. K.; Rodríguez, S.

doi:10.1103/physrevb.8.706

Cited by 59 publications

(16 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The preferred orientation may affect the Raman shift and the calibration of [8,9] can hardly be applied for pressure estimates. The effect of uniaxial stress on Raman spectra of single crystal of ␣-quartz was studied by Tekippe et al [36]. They found that Raman shift of most intense quartz band at 1081 and 464 cm −1 is about 1.5 and 3.7 cm −1 /GPa.…”

Section: Discussionmentioning

confidence: 99%

Raman mapping of coesite inclusions in garnet from the Kokchetav Massif (Northern Kazakhstan)

Korsakov

Hutsebaut

Theunissen

et al. 2007

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

View full text Add to dashboard Cite

Coesite inclusions occur in a wide range of lithologies and coesite is therefore a powerful ultrahigh-pressure (UHP) indicator. The transformation of coesite to quartz is evidenced by three optically well identifiable characteristics (e.g. palisade textures, radial crack patterns, polycrystalline quartz pseudomorphs). Under overpressure monomineralic coesite (on an optical basis), lacking the above transformation characteristics may survive. Raman micro-spectroscopy was applied on monomineralic coesite inclusions in garnet porphyroblasts from diamond-bearing garnet-clinozoisite-biotite gneisses of the Barchi-Kol area (Kokchetav Massif, Northern Kazakhstan). These coesite inclusions are euhedral and display a characteristic anisotropic hallo. However, Raman maps and separate spectra of these inclusions display shifted bands for coesite and quartz. Microscopically undetectable, quartz shows on the Raman map as a thin shell around coesite inclusion. Shift of the main coesite band allows to estimate their overpressure: coesite inclusions record 0-2.4 GPa in garnet and zircon. The quartz shell remains under lower pressure 0-1.6 GPa. The possible application of coesite and quartz Raman geobarometers for UHP metamorphic rocks is discussed.

show abstract

Section: Discussionmentioning

confidence: 99%

Raman mapping of coesite inclusions in garnet from the Kokchetav Massif (Northern Kazakhstan)

Korsakov

Hutsebaut

Theunissen

et al. 2007

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

View full text Add to dashboard Cite

show abstract

“…Influence of pressure and temperature to anharmonicity 489 This procedure was first introduced to study the influence of a uniaxial stress on cubic crystals 61,62 and was extended to uniaxial crystals. 63,64 Instead of the term klm K iklm ε lm u k in Eqn 49, one expresses the strain Hamiltonian as V D ij V ij ε ij .…”

Section: Introduction Of Symmetrymentioning

confidence: 99%

Effect of pressure and temperature on Raman spectra of solids: anharmonicity

Lucazeau

2003

J Raman Spectroscopy

270

222

View full text Add to dashboard Cite

This paper gives a brief review of the effect of temperature and pressure on Raman spectra. Anharmonicity, defined by the cubic, quartic and higher terms in the potential expansion, is shown to be responsible for various properties such as dilatation or for variations of wavenumber and half-width of Raman bands with temperature and pressure, or may be strongly involved in phase transitions. This contribution does not pretend to be an exhaustive review on the subject but aims to introduce some basic concepts in a tutorial way before showing how intricated are these manifestations of anharmonicity. Copyright INTRODUCTIONProperties of materials are dependent on temperature and pressure. All applied research consists in studying the temperature and pressure dependence of their physical properties with a view to preparing the material to exhibit the expected properties in specific conditions of thermal and mechanical stress environment. Basic research consists in relating micro/meso-structural properties with the other physical properties. These relations exist via coupling coefficients which are often defined by a linear relationship. The present review presents the relations which govern the temperature and pressure dependence of the usual spectral parameters such as wavenumber, half-width and intensity of Raman bands. We shall point out the nonlinearity, also defined as anharmonicity, of the corresponding relationships. A tutorial and brief presentation of anharmonic effects in solids can be found in Chapter 8 of Ref. 1. As written by Sherman and Wilkinson, 2,3 in a completely harmonic approximation, where the force constant operating between any two masses is truly a constant and independent of the distance between the masses, the application of pressure would cause no observable frequency shift effects at all. The same statement can be done about the effect of temperature. However, as it becomes evident in the present special issue, this is not verified experimentally.Ł Correspondence to: Guy Lucazeau, LEPMI, (CNRS UMR 5631), Institut National Polytechnique de Grenoble, BP 75, F-38402 St. Martin d'Hères, Cedex, France. E-mail: guy.lucazeau@lepmi.inpg.fr † In memory of Evangelos Anastassakis, who should have been solicited for writing a review paper on such a subject.One of the aims of this paper is to point out that the measurements of temperature-or pressure-induced frequency shifts are measurements of the anharmonicity of the interactions that supply the restoring force constants. Let us point out that because pressure or temperature induces isotropic or anisotropic deformations of molecules and crystals, the pressure or stress-induced and the temperatureinduced frequency shifts  / are mainly determined by the associated deformation V/V. It is thus important to analyze the effects of temperature and pressure together. The origin of the deformation induced by these two external parameters is different. Pressure affects the equilibrium spacings between nuclei, distorts the electron clouds and through them...

show abstract

“…High-temperature Raman studies of ␣-quartz have shown that ␣-to ␤-phase transition takes place at 847 K as indicated by the softening of the line at 207 cm −1 [10,[41][42][43][44][45]. Because the surface temperature of Venus is ∼735 K, most of the quartz on the Venus surface will be in the ␣-phase and can easily be detected with remote Raman spectrometer from the lander.…”

Section: Time-resolved Remote Raman Spectra Of Some Silicate Mineralsmentioning

confidence: 98%

Remote-Raman spectroscopic study of minerals under supercritical CO2 relevant to Venus exploration

Sharma

Misra

Clegg

et al. 2011

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

View full text Add to dashboard Cite

Piezospectroscopic Study of the Raman Spectrum ofα-Quartz

Cited by 59 publications

References 25 publications

Raman mapping of coesite inclusions in garnet from the Kokchetav Massif (Northern Kazakhstan)

Raman mapping of coesite inclusions in garnet from the Kokchetav Massif (Northern Kazakhstan)

Effect of pressure and temperature on Raman spectra of solids: anharmonicity

Remote-Raman spectroscopic study of minerals under supercritical CO2 relevant to Venus exploration

Contact Info

Product

Resources

About