In situ X-ray diffraction investigation of lawsonite and zoisite at high pressures and temperatures

Grevel, Klaus-D.; Nowlan, Elke Ursula; Faßhauer, Detlef W.; Burchard, M.

doi:10.2138/am-2000-0120

Cited by 41 publications

(21 citation statements)

References 23 publications

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“…7), the bulk modulus obtained here decreases monotonically with increasing temperature, at least up to 973 K. As the comparison with the previous results, we have also fitted our high temperature data by using only first order temperature derivative of bulk modulus, and yields V 0 = 674.2(3) Å 3 , K 0 = 126.9(15) GPa, ∂K T,0 /∂T = −0.019(5) GPa K −1 , and α = 2.7(3) × 10 −5 K −1 (see Table 2). The fitted temperature derivative of bulk modulus is consistent or comparable with the previous ones (Grevel et al, 2000;Schilling et al, 2003), which may imply that the second order dependence of bulk modulus on temperature is more precise in describing the equation of state of lawsonite, according to the present results. Chinnery et al (2000) and Grevel et al (2000) have calculated and discussed the reaction positions of lawsonite using their results.…”

Section: High Temperature Resultssupporting

confidence: 91%

“…The fitted temperature derivative of bulk modulus is consistent or comparable with the previous ones (Grevel et al, 2000;Schilling et al, 2003), which may imply that the second order dependence of bulk modulus on temperature is more precise in describing the equation of state of lawsonite, according to the present results. Chinnery et al (2000) and Grevel et al (2000) have calculated and discussed the reaction positions of lawsonite using their results. According to their discussions, the thermoelastic parameters of lawsonite obtained here are reasonable.…”

Section: High Temperature Resultssupporting

confidence: 91%

“…By fixing the K′ 0 at 4 (Daniel et al, 1999;Chinnery et al, 2000;Grevel et al, 2000), we get an isothermal bulk modulus K 0 = 129.3(19) GPa and a unit cell volume V 0 = 674.2(4) Å 3 ( Table 2). The bulk modulus obtained here is very close to that reported by Daniel et al (1999) , β c = 1.96(6) × 10 −3 GPa −1 (Fig.…”

Section: Room Temperature Resultsmentioning

confidence: 99%

“…Several researches have already been done under high pressure and high temperature to clarify the compressibility of lawsonite, by several methods such as diamond anvil cell (DAC) (Comodi and Zanazzi, 1996;Daniel et al 1999), multi anvil (Chinnery et al, 2000;Grevel et al 2000), and brillouin spectroscopy (Schilling et al, 2003). The reported values of the bulk modulus show a large discrepancy, ranging from 96(2) GPa (Comodi and Zanazzi, 1996) to 191(5) GPa .…”

Section: Introductionmentioning

confidence: 99%

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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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Section: High Temperature Resultssupporting

confidence: 91%

Section: High Temperature Resultssupporting

confidence: 91%

Section: Room Temperature Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…Despite this limitation, a few quantitative structural studies by means of EDXD on synchrotron sources have been carried out (Glazer et al, 1978;Buras et al, 1979;Yamanaka & Ogata, 1991). The method has gained increasing popularity as a tool to monitor the change of lattice parameters with pressure (P) and/or temperature (T) in order to derive the corresponding equation of state (see for example Grevel et al, 2000) or to detect the occurrence of phase transformations (Zhang & Guyot, 1999). Both whole-pattern powder decomposition (Morishima et al, 1999) and Rietveld re®nement (Frost & Fei, 1999) have been carried out on EDXD data, but apparently to determine cell parameters only.…”

Section: Introductionmentioning

confidence: 99%

Rietveld refinements on laboratory energy dispersive X-ray diffraction (EDXD) data

Ballirano

Caminiti

2001

J Appl Crystallogr

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Rietveld re®nements of corundum, a rutile and anatase nanocrystalline synthetic mixture, and gypsum, on laboratory energy dispersive X-ray diffraction (EDXD) data are reported. Cell parameters, positional and displacement parameters are in reasonable agreement with single-crystal reference data, despite the rather poor resolution of EDXD data. In particular, good results were obtained for gypsum (unrestrained re®nement) with counting times as short as 1000 s.

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The high‐pressure phase of lawsonite: A single crystal study of a key mantle hydrous phase

et al. 2017

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Lawsonite CaAl2Si2O7(OH)2·H2O is an important water carrier in subducting oceanic crusts and the primary hydrous phase in basalt at depths greater than ~80 km. We have conducted high‐pressure synchrotron single‐crystal X‐ray diffraction experiments on natural lawsonite at room temperature up to ~10.0 GPa to study its high‐pressure polymorphism. We find that lawsonite remains orthorhombic with Cmcm symmetry up to ~9.3 GPa and shows nearly isotropic compression. Above ~9.3 GPa, lawsonite becomes monoclinic with P21/m symmetry. Across the phase transition, the Ca polyhedron becomes markedly distorted, and the average positions of the H2O molecules and hydroxyls change. The changes observed in the H‐atom positions under compression are different than the low‐temperature changes in this material. We resolve for the first time the H‐bonding configuration of the high‐pressure monoclinic phase of lawsonite. A bond valence approach is deployed to determine that the phase transition from orthorhombic to monoclinic is primarily driven by the Si2O7 groups, and in particular their bridging oxygen atoms (O1). The changes in the structure strongly indicate that entropy increases across the symmetry‐lowering transition and hence that the slope of the phase transition is negative. Monoclinic lawsonite is thus stable under the pressure and temperature conditions that exist in the Earth and is likely to be a major water carrier in colder, deep subducted slabs. Monoclinic lawsonite also likely has enhanced electrical conductivity along its c axis due to its dynamically disordered hydrogen atoms.

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In situ X-ray diffraction investigation of lawsonite and zoisite at high pressures and temperatures

Cited by 41 publications

References 23 publications

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

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

Rietveld refinements on laboratory energy dispersive X-ray diffraction (EDXD) data

The high‐pressure phase of lawsonite: A single crystal study of a key mantle hydrous phase

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