The quartz ⇆ coesite transformation: A precise determination and the effects of other components

Bohlen, Steven R.; Boettcher, A. L.

doi:10.1029/jb087ib08p07073

Cited by 467 publications

(201 citation statements)

References 18 publications

(14 reference statements)

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“…However, pressure dependent SHG measurements of quartz are important not only in the context of providing a reference, but also with respect to understanding the phase transformation of SiO 2 phases, which is still of fundamental importance for earth science, physics and chemistry. Around 2 GPa, quartz transforms to coesite at equilibrium conditions [28]. At ambient temperature and at 15 GPa, quartz can start to amorphize [29].…”

Section: Examplesmentioning

confidence: 99%

Second harmonic generation measurements at high pressures on powder samples

Bayarjargal

Winkler

2014

Zeitschrift Für Kristallographie – Crystalline Materials

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This article reviews the most recent results concerning second harmonic generation (SHG) experiments of non-phase matchable and phase matchable powder samples at high pressures and explains the pressure dependence of the intensity of the SHG signal by correlating it to the ratio between the average coherence length and the average particle size. The examples discussed here include pressure-induced structural changes in quartz, ZnO, ice VII and KIO 3 . It is shown that the second harmonic generation technique is a unique tool for the detection of pressure-induced structural phase transitions. It is laboratory based and allows fast measurements. It is complementary to X-ray diffraction and provides additional information about the presence of an inversion center for unknown or controversially discussed structures at high pressure.

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Section: Examplesmentioning

confidence: 99%

Second harmonic generation measurements at high pressures on powder samples

Bayarjargal

Winkler

2014

Zeitschrift Für Kristallographie – Crystalline Materials

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“…Thick solid line indicates the stability of lawsonite from Pawley (1994). Thin dotted lines indicate the transition of quartz to coesite (Bohlen and Boettcher, 1982) and coesite to stishovite (Zhang et al, 1996). Figure 3 shows the representative X-ray diffraction patterns.…”

Section: Experiments Proceduresmentioning

confidence: 99%

Thermal equation of state of lawsonite up to 10 GPa and 973 K

Cai

Inoue

Kikegawa

2015

Journal of Mineralogical and Petrological Sciences

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Thermal equation of state (EoS) of synthetic lawsonite [CaAl 2 Si 2 O 7 (OH) 2 ·H 2 O] has been established using insitu X-ray diffraction methods under high pressure and high temperature. Sodium chloride NaCl was used as the pressure standard in the experiments. The unit-cell volumes were measured up to 10 GPa and 973 K after the deviatric stress was released at high temperature. The P-V-T dataset was analyzed using a Birch-Murnaghan equation of state, yielding the room pressure volume V 0 = 674.2(2) Å 3 and the isothermal bulk modulus at room temperature K 0 = 129(2) GPa (K′ set to 4). These values are comparable with the previous studies. When fitting the high temperature data, a second order temperature derivative of the bulk modulus was considered. Unlike Daneil et al. (1999) who reported a minimum value of bulk modulus at~500 K, the bulk modulus decreases with increasing temperature at least up to 973 K. The dataset yields:, assuming K′ = 4. These data can be used to calculate the density and the stability of lawsonite under high pressure and high temperature conditions.

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“…Pressure was calibrated on the basis of Bi I-II (25.5 kbar) transitions at room temperature (Hall, 1971). The quartz-coesite transformation (29.7 kbar at 1000°C: Bohlen and Boettcher, 1982) was also used for calibration. In the present experiments, a negative correction of 12.4% was adapted to the nominal pressure value as internal friction.…”

Section: Experimental Techniquementioning

confidence: 99%

Ti–in–garnet thermometer for ultrahigh–temperature granulites

Kawasaki

Motoyoshi

2016

Journal of Mineralogical and Petrological Sciences

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We propose a Ti-in-garnet thermometer for ultrahigh-temperature granulites calibrated from experimentally reversed data of the TiO 2 solubility in garnet coexisting with orthopyroxene, rutile and quartz at pressures 7-23 kbar and temperatures 850-1300°C. We confirm that the combined substitution Ti where N is the number of cation per formula unit based on a 12-oxygen atom normalisation. Temperature T and pressure P are given in Kelvin and kbar, respectively. The present thermometer is useful to estimate metamorphic conditions. This new thermometer is applied to natural garnet in geologically and petrologically well-characterised Antarctic ultrahigh-temperature granulites. The resultant pressure and temperature estimates are consistent with those reported from granulites of these areas.

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The quartz ⇆ coesite transformation: A precise determination and the effects of other components

Cited by 467 publications

References 18 publications

Second harmonic generation measurements at high pressures on powder samples

Second harmonic generation measurements at high pressures on powder samples

Thermal equation of state of lawsonite up to 10 GPa and 973 K

Ti–in–garnet thermometer for ultrahigh–temperature granulites

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