Generation of pressures over 40 GPa using Kawai-type multi-anvil press with tungsten carbide anvils

Ishii, Takayuki; Shi, Lanlan; Rong, Hong; Tsujino, Noriyoshi; Druzhbin, Dmitry; Myhill, Robert; Li, Y.; Wang, Lin; Yamamoto, Takafumi; Miyajima, Nobuyoshi; Kawazoe, Takaaki; Nishiyama, Norimasa; Higo, Yuji; Tange, Yoshinori; Katsura, Tomoo

doi:10.1063/1.4941716

Cited by 71 publications

(17 citation statements)

References 26 publications

(17 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…High-pressure synthesis was performed using a Kawai-type multi-anvil apparatus IRIS15, installed at the BGI 39 . The NH 4 N 3 sample (0.5 mm thickness, 0.8 mm in diameter) was sandwiched between two layers of Re powder (0.1 mm thick, 0.8 mm in diameter) and between two tubes of dense alumina in a Re capsule, which also acted as a heater.…”

Section: Methodsmentioning

confidence: 99%

“…Eight tungsten carbide cubes with 1.5 mm truncation edge lengths were used to generate high pressures. The assembly was pressurized at ambient temperature to 33 GPa, following the calibration given by Ishii et al 39 and then heated to ~2273(100) K within 5 min and immediately quenched after the target temperature was reached. The assembly was then decompressed during 16 h.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

High-pressure synthesis of ultraincompressible hard rhenium nitride pernitride Re2(N2)(N)2 stable at ambient conditions

et al. 2019

View full text Add to dashboard Cite

High-pressure synthesis in diamond anvil cells can yield unique compounds with advanced properties, but often they are either unrecoverable at ambient conditions or produced in quantity insufficient for properties characterization. Here we report the synthesis of metallic, ultraincompressible ( K 0 = 428(10) GPa), and very hard (nanoindentation hardness 36.7(8) GPa) rhenium nitride pernitride Re 2 (N 2 )(N) 2 . Unlike known transition metals pernitrides Re 2 (N 2 )(N) 2 contains both pernitride N 2 4− and discrete N 3− anions, which explains its exceptional properties. Re 2 (N 2 )(N) 2 can be obtained via a reaction between rhenium and nitrogen in a diamond anvil cell at pressures from 40 to 90 GPa and is recoverable at ambient conditions. We develop a route to scale up its synthesis through a reaction between rhenium and ammonium azide, NH 4 N 3 , in a large-volume press at 33 GPa. Although metallic bonding is typically seen incompatible with intrinsic hardness, Re 2 (N 2 )(N) 2 turned to be at a threshold for superhard materials.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

High-pressure synthesis of ultraincompressible hard rhenium nitride pernitride Re2(N2)(N)2 stable at ambient conditions

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The anvil truncations for compressing the pressure medium were 4.0 mm. The anvil faces around the truncation were tapered by 1° to create a wide vertical opening to accommodate the X-rays 29,30 . Supplementary Fig.…”

Section: Methodsmentioning

confidence: 99%

Complete agreement of the post-spinel transition with the 660-km seismic discontinuity

Ishii

Rong

Fei

et al. 2018

Sci Rep

View full text Add to dashboard Cite

The 660-km seismic discontinuity, which is a significant structure in the Earth’s mantle, is generally interpreted as the post-spinel transition, as indicated by the decomposition of ringwoodite to bridgmanite + ferropericlase. All precise high-pressure and high-temperature experiments nevertheless report 0.5–2 GPa lower transition pressures than those expected at the discontinuity depth (i.e. 23.4 GPa). These results are inconsistent with the post-spinel transition hypothesis and, therefore, do not support widely accepted models of mantle composition such as the pyrolite and CI chondrite models. Here, we present new experimental data showing post-spinel transition pressures in complete agreement with the 660-km discontinuity depth obtained by high-resolution in situ X-ray diffraction in a large-volume high-pressure apparatus with a tightly controlled sample pressure. These data affirm the applicability of the prevailing mantle models. We infer that the apparently lower pressures reported by previous studies are experimental artefacts due to the pressure drop upon heating. The present results indicate the necessity of reinvestigating the position of mantle mineral phase boundaries previously obtained by in situ X-ray diffraction in high-pressure–temperature apparatuses.

show abstract

“…This pressure at 2300 K was estimated from the FeO content in bridgmanite , in equilibrium with magnesiowüstite and stishovite, using synthetic (Mg 0.7 Fe 0.3 )SiO 3 pyroxene as a starting material (see Text S1 and Figure S1 in the supporting information for pressure calibration details). Runs at pressures above 25 GPa were performed using a 7 and 5.7 mm pressure medium and 3 and 1.5 mm truncation, respectively, in a 15-MN press with a DIA-type guide block system (IRIS-15) (Ishii et al, 2016). Figure 2b shows the relationships between pressures and press loads at temperatures of 1700 and 2000 K for IRIS-15, which were calibrated using decomposition of pyrope into aluminous bridgmanite and corundum and the Al 2 O 3 solubility in bridgmanite .…”

Section: Experimental Methodsmentioning

confidence: 99%

“…(b) Pressure calibration curve at 1700 (circle) and 2000 K (triangle) for the IRIS-15 multianvil apparatus, based on the phase transition of pyrope to bridgmanite and corundum and various Al 2 O 3 solubility (mol %) in bridgmanite at 2000 K . Pressure calibration at room temperature condition is from Ishii et al (2016).…”

Section: Experimental Methodsmentioning

confidence: 99%

Phase Relations in the System MgSiO₃‐Al₂O₃ up to 2300 K at Lower Mantle Pressures

et al. 2017

View full text Add to dashboard Cite

Phase relations in the system MgSiO3‐Al2O3 were investigated at pressures of 27–45 GPa and temperatures of 1700, 2000, and 2300 K using sintered diamond and tungsten carbide anvils in a multianvil apparatus. The bulk compositions in the MgSiO3‐Al2O3 binary system crystallize a phase assemblage of pyrope and corundum at pressures below 27 GPa and an assemblage of bridgmanite and corundum at pressures above 27 GPa regardless of temperatures. The solubility of Al2O3 in bridgmanite and that of MgSiO3 in corundum increases significantly with increasing temperature. The solubility of Al2O3 in bridgmanite increases from 6.7 mol % at 1700 K to 21.8 mol % at 2500 K under a constant pressure of 27 GPa. Bridgmanite becomes more aluminous with increasing pressure from 27 to 45 GPa at a given temperature. The MgSiO3 content in corundum increases with increasing pressure at pressure lower than 27 GPa, while it decreases at pressure higher than 27 GPa. Our results suggest that bridgmanite can incorporate a considerably higher Al2O3 content than that of the pyrope composition (25 mol % Al2O3). The present study further suggests that the entire Al2O3 component is accommodated into bridgmanite in the pyrolite lower mantle. However, Al2O3 cannot be fully accommodated into bridgmanite in the coldest parts of subducted slabs in the shallow part of the lower mantle, and therefore, additional phases such as MgAl2O4 with calcium ferrite‐type structure are necessary to host the excess Al2O3.

show abstract

Generation of pressures over 40 GPa using Kawai-type multi-anvil press with tungsten carbide anvils

Cited by 71 publications

References 26 publications

High-pressure synthesis of ultraincompressible hard rhenium nitride pernitride Re2(N2)(N)2 stable at ambient conditions

High-pressure synthesis of ultraincompressible hard rhenium nitride pernitride Re2(N2)(N)2 stable at ambient conditions

Complete agreement of the post-spinel transition with the 660-km seismic discontinuity

Phase Relations in the System MgSiO₃‐Al₂O₃ up to 2300 K at Lower Mantle Pressures

Contact Info

Product

Resources

About

Generation of pressures over 40 GPa using Kawai-type multi-anvil press with tungsten carbide anvils

Cited by 71 publications

References 26 publications

High-pressure synthesis of ultraincompressible hard rhenium nitride pernitride Re2(N2)(N)2 stable at ambient conditions

High-pressure synthesis of ultraincompressible hard rhenium nitride pernitride Re2(N2)(N)2 stable at ambient conditions

Complete agreement of the post-spinel transition with the 660-km seismic discontinuity

Phase Relations in the System MgSiO3‐Al2O3 up to 2300 K at Lower Mantle Pressures

Contact Info

Product

Resources

About

Phase Relations in the System MgSiO₃‐Al₂O₃ up to 2300 K at Lower Mantle Pressures