X-ray diffraction and infrared spectroscopy of monazite-structured CaSO4 at high pressures: Implications for shocked anhydrite

Bradbury, Scott Edwin; Williams, Quentin

doi:10.1016/j.jpcs.2008.09.008

Cited by 24 publications

(28 citation statements)

References 34 publications

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“…The increase of pressure can yield to the stabilization of the monazite structure. Many authors 315,317,318,335,384 have observed CaSO 4 undergoing phase transitions from its ambient anhydrite structure to the monazite type at P = 2 GPa, then at higher pressure and temperature to crystallize in the baritetype structure. Bradbury and Williams 317 conducted X-ray diffraction and infrared spectroscopy on CaSO 4 to pressures of 28 and 25 GPa, respectively.…”

Section: Influence Of Pressurementioning

confidence: 99%

Crystal chemistry of the monazite structure

Clavier

Podor

Dacheux

2011

Journal of the European Ceramic Society

329

243

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Section: Influence Of Pressurementioning

confidence: 99%

Crystal chemistry of the monazite structure

Clavier

Podor

Dacheux

2011

Journal of the European Ceramic Society

329

243

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“…Static in situ high-pressure studies on anhydrite have reported various phase transitions. Stephens (1964), Crichton et al (2005), Ma et al (2007), and Bradbury and Williams (2009) showed that anhydrite transforms between 2 and 5 GPa to a high-pressure phase with monoclinic monazite structure. This phase transition is unquenchable and the change in structure was proven by in situ X-ray and Raman measurements in a diamond anvil cell.…”

Section: Phase Transitionsmentioning

confidence: 99%

Shock experiments on anhydrite and new constraints on the impact‐induced SO_x release at the K‐Pg boundary

Prescher

Langenhorst

Hornemann

et al. 2011

Meteorit & Planetary Scien

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Abstract-We have performed six shock experiments at nominal peak-shock pressures of 12.5, 20, 33, 46.5, 64, and 85 GPa using polycrystalline anhydrite discs embedded in ARMCO-Fe sample containers and the shock reverberation technique. The recovered samples were analyzed using X-ray powder diffraction and transmission electron microscopy (TEM). The X-ray diffraction patterns recorded on all samples are compatible with the anhydrite structure; extra-peaks have not been observed. Peak intensities decrease and peak broadening increases progressively in the pressure range from 0 to 46.5 GPa. At higher pressures, peak broadening diminishes and the X-ray diffraction pattern of the 85 GPa sample resembles essentially that of unshocked, wellcrystallized anhydrite. Related structural changes at the nanoscale include in the pressure regime up to 20 GPa ''cold'' deformation phenomena such as cracks and deformation twins. Dislocation density increases up to 33 GPa and the strain increases up to 46.5 GPa. In the pressure range from 46.5 to 85 GPa, high postshock temperatures caused annealing of the deformation features. Increasing density and size of voids in the anhydrite samples shocked at 64 and 85 GPa indicate partial decomposition of anhydrite. Recalculation of the peak-shock pressure in the experiments to a more realistic natural loading path indicates the onset of degassing of anhydrite in the pressure range of 30-41 GPa.

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“…At pressures below ∼8 GPa, hanksite's compressibility is similar to previous measurements of BaSO 4 compressibility (Lee et al 2003; 3.9(2) 0.23(1) Notes: Mode Grüneisen parameters calculated from γ i = (K 0,T /ν 0 )(dν i /dP) T (Knittle et al 2001) using the bulk modulus 66(1) GPa determined in the X-ray diffraction experiment. Mode Grüneisen parameters compare to sulfate ν 1 parameter of 0.21(2) in gypsum and a sulfate ν 1 parameter of 0.6(2) in pressurized anhydrite (Knittle et al 2001;Bradbury and Williams 2009). volume as a function of pressure, which yields K 0,T = 132(1) GPa (with K′ fixed at 4). In the diffraction experiments we observe evidence of a transition in the tychite unit-cell structure by 12-15 GPa.…”

Section: X-ray Diffractionmentioning

confidence: 91%

“…By 9-10 GPa, notable broadening of peaks is seen in both hanksite and tychite patterns. Equationof-state fits to the data were conducted below these pressures compressible and is most akin to the monazite-structured CaSO 4 (Bradbury and Williams 2009).…”

Section: Effects Of Non-hydrostaticitymentioning

confidence: 99%

“…The high-pressure behavior of the sulfates gypsum and anhydrite have been studied both theoretically (Gracia et al 2012) and experimentally via X-ray diffraction and IR/Raman spectroscopy methods (Bradbury and Williams 2009;Comodi et al 2008;Ma et al 2007;Knittle et al 2001;Chen et al 2001;Huang et al 2000). In addition, much study has gone into MgSO 4 , BaSO 4 , various lithium sulfates, and sulfate salts (Lemos et al 1991;Sakuntala andArora 1999, 2000;Chen et al 2009Chen et al , 2010Brand et al 2010;Machon et al 2010;Crichton et al 2011;Jahn and Schmidt 2010;Zhang and Sekine 2007;Santamaría-Pérez et al 2011;Antao 2012).…”

Section: Introductionmentioning

confidence: 99%

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Spectroscopic and X-ray diffraction investigation of the behavior of hanksite and tychite at high pressures, and a model for the compressibility of sulfate minerals

Palaich

Manning

Schauble

et al. 2013

American Mineralogist

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The rare evaporite minerals hanksite, Na 22 K(SO 4 ) 9 (CO 3 ) 2 Cl, and tychite, Na 6 Mg 2 (CO 3 ) 4 (SO 4 ), are excellent case studies for the high-pressure behavior of ionic groups since their structures combine ionic complexity and high symmetry (hexagonal P6 3 /m and cubic Fd3, respectively). Here we investigate the structure and compressibility of hanksite up to 20 GPa in the diamond-anvil cell using Raman spectroscopy and X-ray diffraction and of tychite up to 17 GPa in the diamond cell using X-ray diffraction and first-principles modeling. At ambient pressure, the Raman spectrum of hanksite has a single sulfate ν 1 frequency at 992 cm -1 with a lower-frequency shoulder. As pressure is increased, this mode splits into two distinct peaks, which arise from two distinct local environments for the sulfate tetrahedra within the hanksite structure. Below 10 GPa, the mode Grüneisen parameter of the dominant sulfate ν 1 frequency is 0.27(1); the mode Grüneisen parameter of the lower frequency shoulder is 0.199(7). X-ray diffraction data of hanksite indicate a 5% volume drop between 8-10 GPa with no apparent change of symmetry. A Birch-Murnaghan fit to the data below 8 GPa yields an isothermal bulk modulus of 66(1) GPa for hanksite and 85(1) GPa for tychite, with K′ fixed at 4.

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X-ray diffraction and infrared spectroscopy of monazite-structured CaSO4 at high pressures: Implications for shocked anhydrite

Cited by 24 publications

References 34 publications

Crystal chemistry of the monazite structure

Crystal chemistry of the monazite structure

Shock experiments on anhydrite and new constraints on the impact‐induced SO_x release at the K‐Pg boundary

Spectroscopic and X-ray diffraction investigation of the behavior of hanksite and tychite at high pressures, and a model for the compressibility of sulfate minerals

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X-ray diffraction and infrared spectroscopy of monazite-structured CaSO4 at high pressures: Implications for shocked anhydrite

Cited by 24 publications

References 34 publications

Crystal chemistry of the monazite structure

Crystal chemistry of the monazite structure

Shock experiments on anhydrite and new constraints on the impact‐induced SOx release at the K‐Pg boundary

Spectroscopic and X-ray diffraction investigation of the behavior of hanksite and tychite at high pressures, and a model for the compressibility of sulfate minerals

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Shock experiments on anhydrite and new constraints on the impact‐induced SO_x release at the K‐Pg boundary