Structure determination of α-quartz up to 68 x 10<sup>8</sup> Pa

d’Amour, H.; Denner, Warren W.; Schulz, Hans‐Joachim

doi:10.1107/s056774087900412x

Cited by 143 publications

(40 citation statements)

References 2 publications

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“…The high percentage of accessible reflections along with the effectiveness of the 'corrections' for absorption are reflected in the high precision of the results (Tables 2 a-5 a): They are in excellent agreement with previous ambient-pressure studies (Y oun g and Post, 1962;Smith and Alexander, 1963;Zachariasen and Plettinger, 1965;Le Page and Donnay, 1976;Le Page, Calvert and Gabe, 1980;Levien, Prewitt and Weidner, 1980;Wright and Lehmann, 1981;Lager, Jorgensen and Rotella, 1982;Will, Parrish and Huang, 1983;Ogata, Takeuchi and Kudoh, 1987;Hazen et al, 1989;Kihara, 1990), and the high-pressure results have higher precision than those from any other previous high-pressure study (Jorgensen, 1978;D'Amour, Denner and Schulz, 1979;Levien, Prewitt and Weidner, 1980;Ogata, Takeuchi and Kudoh, 1987;Hazen et al, 1989). Table 5 a gives atomic distances and bond angles as calculated with the program BONDLA of the X-RAY system (Stewart et al, 1972).…”

Section: The Structure Refinements Were Based On |F| Values With Weigsupporting

confidence: 82%

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Crystal structures of the low-temperature quartz-type phases of SiO₂ and GeO₂ at elevated pressure

Glinnemann¹,

King²,

Schulz³

et al. 1992

Zeitschrift Für Kristallographie - Crystalline Materials

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Section: The Structure Refinements Were Based On |F| Values With Weigsupporting

confidence: 82%

“…Brought to you by | New York University Bobst Library Technical Service Authenticated Download Date | 6/9/15 5:10 AM Denner and Schulz (1979). However, the increase in the c/a ratio with pressure, already observed by these authors (Fig.…”

Section: Intra-tetrahedral Features: Generalmentioning

confidence: 61%

Crystal structures of the low-temperature quartz-type phases of SiO₂ and GeO₂ at elevated pressure

Glinnemann¹,

King²,

Schulz³

et al. 1992

Zeitschrift Für Kristallographie - Crystalline Materials

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“… 1 – high‐temperature experiments (Kihara, 1990); 2 – natural quartz (ICDD, 1993, card 33–1161); 3 – quartz after coesite (Ikuta et al. , 2007); 4, 5, 6, 7 – high‐pressure experiments [4 –D’Amour et al. , 1979; 5 –Levien et al.…”

Section: Analytical Resultsmentioning

confidence: 99%

Pressure‐induced incipient amorphization of α‐quartz and transition to coesite in an eclogite from Antarctica: a first record and some consequences

Palmeri

Frezzotti

Godard

et al. 2009

Journal Metamorphic Geology

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Monocrystalline quartz inclusions in garnet and omphacite from various eclogite samples from the Lanterman Range (Northern Victoria Land, Antarctica) have been investigated by cathodoluminescence (CL), Raman spectroscopy and imaging, and in situ X-ray (XR) microdiffraction using the synchrotron. A few inclusions, with a clear-to-opalescent lustre, show ÔanomalousÕ Raman spectra characterized by weak a-quartz modes, the broadening of the main a-quartz peak at 465 cm )1 , and additional vibrations at 480-485, 520-523 and 608 cm )1 . CL and Raman imaging indicate that this ÔanomalousÕ a-quartz occurs as relicts within ordinary a-quartz, and that it was preserved in the internal parts of small quartz inclusions. XR diffraction circular patterns display irregular and broad a-quartz spots, some of which show an anomalous d-spacing tightening of 2%. They also show some very weak, hazy clouds that have d-spacing compatible with coesite but not with a-quartz. Raman spectrometry and XR microdiffraction characterize the anomalies with respect to a-quartz as (i) a pressure-induced disordering and incipient amorphization, mainly revealed by the 480-485 and 608-cm )1 Raman bands, together with (ii) a lattice densification, evidenced by d-spacing tightening; (iii) the cryptic development of coesite, 520-523 cm )1 being the main Raman peak of coesite and (iv) Brazil micro-twinning. This ÔanomalousÕ a-quartz represents the first example of pressure-induced incipient amorphization of a metastable phase in a crustal rock. This issue is really surprising because pressure-induced amorphization of metastable a-quartz, observed in impactites and known to occur between 15 and 32 GPa during ultrahigh-pressure (UHP) experiments at room temperature, is in principle irrelevant under normal geological P-T conditions. A shock (due to a seism?) or a local overpressure at the inclusion scale (due to expansion mismatch between quartz and its host mineral) seem the only geological mechanisms that can produce such incipient amorphization in crustal rocks. This discovery throws new light on the modality of the quartz-coesite transition and on the pressure regimes (non-lithostatic v. lithostatic) during highpressure ⁄ UHP metamorphism. In particular, incipient amorphization of quartz could favour the quartz-coesite transition, or allow the growth of metastable coesite, as already experimentally observed.

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“…A great deal of data has been collected in this way about the ratios ~(p, 0o) and • (p, 0o) + fl(p, 0o), which describe the isothermal changes-with pressure of the lattice parameters, or also the change with pressure of the isothermal linear compressibility in the various directions of the lattice unit cell, at room temperature. See for instance Levien et al [22], Jorgensen [23], Bridgman [41], [42], D'Amour et al [43], Vaidya et al [44], Mc Whan [45], Olinger and Halleck [46], Taylor [18]. Of course, for symmetry reasons, only two directions are important in low quartz: the one which is parallel to the optic axis and one orthogonal to it.…”

Section: [18 P 78]mentioning

confidence: 99%

“…Extrapolation formulas other than (6.5) are discussed by Anderson [50]; a very useful one is given by the Birch equation (see Birch [51], [52], or also D'Amour et al [43], Mc Whan [45]). However, the non-polynomial formula which is by far the most widely used is known as the Murnaghan equation (see for instance Murnaghan [53], Truesdell and Noll [27,p.…”

Section: [18 P 78]mentioning

confidence: 99%

Thermoelastic stability of multiple growth twins in quartz and general geobarothermometric implications

Zanzotto

1990

J Elasticity

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Al~tract. The thermoelastic analysis of the possible stable stress-free equilibrium states of polycrystals provides a theoretical way of distinguishing "true" twins from random intergrowths. We analyze in detail a four-fold cyclic twin in quartz, and we show that this gives also the basis for a new technique of geobarothermometry. To obtain the harothermometric function, the simultaneous dependence upon the external pressure and temperature of the lattice-parameter has been estimated; an explicit five-parameter, temperature-corrected version of the Thurston isothermal constitutive equations is presented.Rias~tmto. L'analisi degli stati naturali possibili nei policristalli termoelastici fornisce una base teorica per la distinzione tra "veri" geminati di crescita e formazioni efistalline casuali. Si analizza qui in dettaglio il caso di un gcminato cielico di ordine quattro del quarzo, e si mostra come ei6 offra anche un nuovo metodo geoharotermometrieo. Per rendere esplieita la funzione barotermometrica si ~ stimato l'effetto della pressione e della temperatura ambientali sui parametri reticolari. Si presenta una correzione a cinque parametri dipendenti dalla temperatura delle equazioni costitutive ottenute da Thurston nel caso isotermo.

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Structure determination of α-quartz up to 68 x 10⁸ Pa

Cited by 143 publications

References 2 publications

Crystal structures of the low-temperature quartz-type phases of SiO₂ and GeO₂ at elevated pressure

Crystal structures of the low-temperature quartz-type phases of SiO₂ and GeO₂ at elevated pressure

Pressure‐induced incipient amorphization of α‐quartz and transition to coesite in an eclogite from Antarctica: a first record and some consequences

Thermoelastic stability of multiple growth twins in quartz and general geobarothermometric implications

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Structure determination of α-quartz up to 68 x 108 Pa

Cited by 143 publications

References 2 publications

Crystal structures of the low-temperature quartz-type phases of SiO2 and GeO2 at elevated pressure

Crystal structures of the low-temperature quartz-type phases of SiO2 and GeO2 at elevated pressure

Pressure‐induced incipient amorphization of α‐quartz and transition to coesite in an eclogite from Antarctica: a first record and some consequences

Thermoelastic stability of multiple growth twins in quartz and general geobarothermometric implications

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Structure determination of α-quartz up to 68 x 10⁸ Pa

Crystal structures of the low-temperature quartz-type phases of SiO₂ and GeO₂ at elevated pressure

Crystal structures of the low-temperature quartz-type phases of SiO₂ and GeO₂ at elevated pressure