Acoustic velocities and elastic properties of pyrite (FeS2) to 9.6 GPa

Abstract

Ultrasonic interferometry was utilized in conjunction with synchrotron-based X-ray diffraction and X-radiographic imaging to determine the compressional and shear wave velocities and unit-cell volumes of pyrite (FeS 2 ) at room temperature and pressures up to 9.6 GPa. Fitting all of the experimental volume and velocity data to third-order finite-strain equations yielded the adiabatic zero-pressure bulk and shear moduli and their first pressure derivatives: K S0 =138.9(7) GPa, G 0 =112.3(3) GPa, (∂K S0 /∂P) T =K S0 '=6.0(1), (∂G 0 /∂P) T =G 0 '=3.0(<1), where the numbers in parentheses represent the 1σ uncertainty in the last significant digit. These results are in good agreement with several previous static compression studies on this material but differ quite strongly from the results obtained via first principles calculations. This study presents the first direct measurement of the bulk shear properties of this material. KEY WORDS: mineral physics, ultrasonic interferometry, high pressure, iron sulfide, elastic property, equation of state.

In situ Raman spectroscopic studies of FeS2 pyrite up to 675 K and 2100 MPa using a hydrothermal diamond anvil cell

“…where bulk modulus, B 0 = 138.9GPa at ambient pressure, and its pressure derivative, B 0 ' = 6.0, are taken from Whitaker et al (2010). Our results agree well with 1.36 and 1.40 presented by Kleppe and Jephcoat (2004).…”

Nanoindentation of Horn River Basin Shales: The Micromechanical Contrast Between Overburden and Reservoir Formations

“…The chemo‐mechanical clustering of the A20 indentation data is shown in Figure 15. In the parallel indentation direction, one indent (indicated on Figure 15a) can be easily identified as pyrite, having stiffness and hardness much greater than other phases and corresponding well with previous estimates, for example, E py = 265 GPa (Whitaker et al., 2010). This data point was excluded from the GMM algorithm.…”

Poisson's Ratio and Auxetic Properties of Natural Rocks

“…Experimental data of 10 halides, 12 carbonates, 10 sulfides, 8 sulfates, and 8 phosphates are shown in Figure and Table . Minerals with υ < 0.2 are the following: berlinite (0.09 (Chang & Barsch, ) and 0.14 (Ecolivet & Poignant, )), fluorite (0.133 (Speziale & Duffy, )), aragonite (0.178 (Hearmon, )), alunite (0.191 (Majzlan et al, ), and pyrite (0.160 (Simmons & Birch, ), 0.182 (Whitaker et al, ), and 0.187 (Benbattouche et al, )). It is interesting to notice that berlinite is an aluminium phosphate (AlPO 4 ) which possesses the same crystal structure as quartz with a low‐temperature structure of α ‐quartz and a high‐temperature structure of β ‐quartz (Christie & Chelikowsky, ; Muraoka & Kihara, ).…”

“…The minerals with υ < 0.2 are indicated. The data were compiled from Anderson and Isaak (), Benbattouche et al (), Chang and Barsch (), Chen et al (), Christensen (), Dandekar (, ), Ecolivet and Poignant (), Gilmore and Katz (), Haussühl (), Hearmon (), Humbert and Plicque (), Kobiakov (), Liu et al (), Mainprice et al (), Majzlan et al (), Mogilevsky et al (), Peselnick and Meister (), Simmons and Birch (), Speziale and Duffy (), Vo Thanh and Lacam (), Whitaker et al (), Yamamoto and Anderson (), and Zhao and Weidner ().…”