Temperature Dependence of the Raman Frequency of an Internal Mode for SiO2-Moganite Close to theα-βTransition

Lider, Mustafa Cem; Yurtseven, H.

doi:10.1155/2012/892696

Cited by 9 publications

(3 citation statements)

References 18 publications

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“…The details of the calculation can be found in the supporting information (see Figure S6). The obtained isothermal value γ = 0.64 ± 0.02 turned out to be comparable with the isobaric value 0.75, which was obtained for this parameter from the temperature dependences of frequencies in [53].…”

Section: Vibrational Properties Of Moganite Under Pressuresupporting

confidence: 83%

Density Functional Study of Structural and Vibrational Properties of α-Moganite

Pankin,

Smirnov,

Roginskii

et al. 2023

Photonics

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α-moganite is a recently discovered polymorph of silica, commonly intergrown with quartz in natural microcrystalline silica samples. An important challenge is finding an effective method for estimating its amount in a sample under study, which is important for its applications, related to the technology of growth of dielectric layers, as well as for fundamental problems, related to the formation of both terrestrial and lunar mineral deposits and biogenic formation. One of these methods is vibrational spectroscopy, with the help of which the presence of a particular compound is determined by the presence of characteristic spectral lines. In this work, the search for such lines is carried out using density functional theory calculations and comparisons of the IR and Raman spectra of α-quartz and α-moganite. With the help of such calculations, the stability of the moganite structure has been proven for the first time, and its spectral characteristics have been determined over the entire range of vibrational frequencies. Several new spectral lines characteristic of α-moganite were discovered in the 65–85 cm−1 region. Moreover, the evolution of spectral peculiarities under hydrostatic pressure was studied.

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Section: Vibrational Properties Of Moganite Under Pressuresupporting

confidence: 83%

Density Functional Study of Structural and Vibrational Properties of α-Moganite

Pankin,

Smirnov,

Roginskii

et al. 2023

Photonics

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“…We have studied the Raman frequency shifts and linewidths in quartz [21,24], and in SiO 2 -moganite [40] previously. We have also studied the critical behavior of the specific heat C p near the a-b transition [39] and we have established the Pippard relations [38] in quartz by analyzing the experimental data [25,35].…”

Section: Introductionmentioning

confidence: 99%

α-β Transition in Quartz: Temperature and Pressure Dependence of the Thermodynamic Quantities for β-Quartz and β-Cristobalite as Piezoelectric Materials

Lider

Yurtseven

2014

3D Res

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Temperature and pressure dependencies of the thermal expansivity (a p ), isothermal compressibility (j T ) and the specific heat (C p -C v ) are studied for piezoelectric materials, in particular, for b-quartz. By analyzing the temperature (at 1 atm) and pressure (at 848 K) dependence of the observed volume V from the literature, the thermodynamic functions (a p , j T and C p -C v ) are obtained and the Pippard relations (C p -C v vs. Va p and a p vs. j T ) close to the transition from the b-quartz to the b-cristobalite are examined.

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“…This has been the subject of a number of studies in quartz [6,12,[19][20][21][22]. We have also studied the soft modes by calculating the Raman frequencies and the linewidths for the -transition in quartz [23,24] and in SiO 2 moganite [25].…”

Section: Introductionmentioning

confidence: 99%

Temperature Dependence of the Bragg Peak-Intensity Close to the α-Incommensurate-β Transition in Quartz

Yurtseven

Kaymazlar

2014

Journal of Solid State Physics

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Quartz as a mineral has a stable crystalline phase at room temperature and atmospheric pressure; at low temperatures it is in the phase and when it is heated up, it transforms into the phase through the intermediate (incommensurate) phase within the temperature interval of nearly 1.3 K at around 847 K. The order parameter occurs due to a tilting of SiO 4 tetrahedra around the threefold axis, which can be related to variation of the peak-intensity with the temperature in quartz. In this study, we analyze the temperature dependence of the Bragg peak-intensity measured through the -transition in quartz, as obtained from the literature according to a power-law formula. From our analysis, we deduce the values of the critical exponent for the order parameter (Bragg peak-intensity) for the -incommensurate (IC-) transition. Our values indicate that the -IC phase transition is of a second order and that the IC-phase transition is of a weak first order, as also reported in the literature.

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Temperature Dependence of the Raman Frequency of an Internal Mode for SiO₂-Moganite Close to theα-βTransition

Cited by 9 publications

References 18 publications

Density Functional Study of Structural and Vibrational Properties of α-Moganite

Density Functional Study of Structural and Vibrational Properties of α-Moganite

α-β Transition in Quartz: Temperature and Pressure Dependence of the Thermodynamic Quantities for β-Quartz and β-Cristobalite as Piezoelectric Materials

Temperature Dependence of the Bragg Peak-Intensity Close to the α-Incommensurate-β Transition in Quartz

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