Fe0.79Si0.07B0.14metallic glass gaskets for high-pressure research beyond 1 Mbar

Dong, Wen‐Kui; Glazyrin, Konstantin; Khandarkhaeva, Saiana; Fedotenko, Timofey; Bednarčı́k, J.; Dubrovinsky, Leonid; Liermann, Hanns‐Peter

doi:10.1107/s1600577522007573

Cited by 7 publications

(4 citation statements)

References 52 publications

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“…Holes with diameters of about 150 μm were laser‐drilled into the gaskets. Given the small amount of sample used in DAC experiments and the relatively low‐Z character of stishovite in comparison to rhenium, a ring of amorphous metallic glass with the chemical composition of Fe 0.79 Si 0.07 B 0.14 was placed inside the rhenium gasket hole to avoid parasitic diffraction from the rhenium gasket (Dong et al., 2022; Méndez et al., 2020). The outer and inner diameters of the rings were approximately 130 and 80 μm, respectively.…”

Section: Methodsmentioning

confidence: 99%

Strong Effect of Stress on the Seismic Signature of the Post‐Stishovite Phase Transition in the Earth's Lower Mantle

Wang

Buchen

Méndez

et al. 2023

Geophysical Research Letters

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SiO 2 stishovite is expected to constitute 20-25 vol.% of subducted metamorphosed Mid-Ocean Ridge Basalt (MORB) in the Earth's lower mantle (Hirose et al., 2005;Ishii et al., 2022). SiO 2 -rich domains with excess SiO 2 in the form of stishovite may also have formed by partial melting of bridgmanite-rich rocks or by the crystallization of a magma ocean in the lower mantle (Amulele et al., 2021;Boujibar et al., 2016). Additionally, according to geophysical and geochemical models, SiO 2 may have exsolved from the Earth's liquid outer core and dispersed throughout the lower mantle by convection (Helffrich et al., 2018;Hirose et al., 2017). Therefore, understanding the physical properties of solid SiO 2 phases under lower mantle conditions is essential for understanding geodynamic processes such as deep subduction of oceanic crust and convective dispersal of silica-rich rocks as well as quantifying the abundance of SiO 2 in the deep mantle.An important feature of SiO 2 in the lower mantle is the phase transition from stishovite to post-stishovite, which modifies the scattering of seismic waves by stishovite-bearing rocks such as deeply subducted and metamorphosed MORB (Buchen, 2021;Kaneshima & Helffrich, 2010;Marquardt & Thomson, 2020). Experimental and theoretical studies on crystalline SiO 2 polymorphs have shown that the tetragonal crystal structure of stishovite (space group: P4 2 /mnm) distorts to the orthorhombic high-pressure polymorph post-stishovite (space group: Pnnm) at around 55 GPa at room temperature and under quasi-hydrostatic conditions (e.g., Andrault et al., 1998).

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Section: Methodsmentioning

confidence: 99%

Strong Effect of Stress on the Seismic Signature of the Post‐Stishovite Phase Transition in the Earth's Lower Mantle

Wang

Buchen

Méndez

et al. 2023

Geophysical Research Letters

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“…Platinum powder was mixed with the sample as pressure marker and this mixture was loaded without a pressure transmitting medium in two diamond-anvil cells (DACs), RH1 and RH2, with 150 μm culet size diamonds. Rhenium gaskets with inserts of Fe0.79Si0.06B0.15 metallic glass were used to avoid parasitic Re peaks (Dong et al, 2022).…”

Section: Experimental Approachmentioning

confidence: 99%

Compressibility of ferropericlase at high-temperature: evidence for the iron spin crossover in seismic tomography

Trautner¹,

Stackhouse²,

Turner³

et al. 2023

Preprint

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The iron spin crossover in ferropericlase, the second most abundant mineral in Earth’s lower mantle, causes changes in a range of physical properties, including seismic wave velocities. Understanding the effect of temperature on the spin crossover is essential to detect its signature in seismic observations and constrain its occurrence in the mantle. Here, we report the first experimental results on the spin crossover-induced bulk modulus softening at high temperatures, derived directly from time-resolved x-ray diffraction measurements during continuous compression of (Mg0.8Fe0.2)O in a resistive-heated dynamic diamond-anvil cell. We present new theoretical calculations of the spin crossover at mantle temperatures benchmarked by the experiments. Based on our results, we create synthetic seismic tomography models to investigate the signature of the spin crossover in global seismic tomography. A tomographic filter is applied to allow for meaningful comparisons between the synthetic models and data-based seismic tomography models, like SP12RTS. A negative anomaly in the correlation between Vs variations and Vc variations (S-C correlation) is found to be the most suitable measure to detect the presence of the spin crossover in tomographic models. When including the effects of the spin crossover, the misfit between the synthetic model and SP12RTS is reduced by 63%, providing strong evidence for the presence of the spin crossover, and hence ferropericlase, in the lower mantle. Future improvement of seismic resolution may facilitate a detailed mapping of spin state using the S-C correlation, providing constraints on mantle temperatures, thanks to the temperature sensitivity of the spin crossover.

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“…Rhenium (Re) gaskets preindented to ∼30 μm and drilled with a hole at the center with approximately half of the diamond culet diameter served as sample chambers. In some of the runs, an amorphous metallic glass (Fe 0.79 Si 0.07 B 0.14 ) insert lining the gasket [36] was employed avoiding parasitic scattering from Re that could overlap with the weak sample reflections.…”

Section: A Diamond Anvil Cell (Dac) Techniquesmentioning

confidence: 99%

“…S1 and S2, respectively, of the Supplemental Material [43]. The characteristic (110) reflection of the bcc ADH-DMA phase was generally the most intense diffraction line observed up to the highest pressure and could be resolved without overlap with the gasket signal because of the use of metallic glass inserts [36]. Weak signals arising from the Re gasket are however observed in the diffraction patterns from samples that were not prepared with metallic glass inserts (Fig.…”

Section: A Pressure Evolution Of Adh-dma Phase To Mbar Pressuresmentioning

confidence: 99%

Equation of state of ammonia dihydrate up to 112 GPa by static and dynamic compression experiments in diamond anvil cells

et al. 2023

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Understanding the high-pressure behavior of ammonia hydrates is relevant for modeling the interior of solar and extrasolar icy bodies. We present here the results of high-pressure x-ray diffraction studies on ammoniadihydrate (ADH) at room temperature (298 K) up to 112 GPa, employing both static and dynamic compression experiments performed in diamond anvil cells. The derived pressure-volume (P-V) compression curves are in excellent agreement regardless of the compression technique. In contrast to early theoretical predictions, our results indicate the stability of the disordered molecular alloy (DMA) phase, a body centered cubic (bcc) structure, and the absence of self-ionization in the investigated pressure range. By combining the P-V data from seven different compression runs, we derive the first equation of state for ADH-DMA based on the third-order Birch-Murnaghan formalism with best-fit parameters: V 0 = 23.96 ± 0.03 (Å 3 /molecule), B 0 = 9.95 ± 0.14 GPa, and B 0 = 6.59 ± 0.03. The instantaneous bulk modulus directly derived from the quasicontinuous compression curves displays a smooth increase upon compression that further supports the absence of structural transitions.

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Fe_0.79Si_0.07B_0.14metallic glass gaskets for high-pressure research beyond 1 Mbar

Cited by 7 publications

References 52 publications

Strong Effect of Stress on the Seismic Signature of the Post‐Stishovite Phase Transition in the Earth's Lower Mantle

Strong Effect of Stress on the Seismic Signature of the Post‐Stishovite Phase Transition in the Earth's Lower Mantle

Compressibility of ferropericlase at high-temperature: evidence for the iron spin crossover in seismic tomography

Equation of state of ammonia dihydrate up to 112 GPa by static and dynamic compression experiments in diamond anvil cells

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