Over 1 Mbar generation in the Kawai-type multianvil apparatus and its application to compression of (Mg0.92Fe0.08)SiO3 perovskite and stishovite

Ito, Eiji; Yoshino, Takashi; Tsujino, Noriyoshi; Yoneda, Akira; Guo, Xinzhuan; Xu, Fang; Higo, Yuji; Funakoshi, K.

doi:10.1016/j.pepi.2014.01.013

Cited by 56 publications

(17 citation statements)

References 33 publications

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“…Fortunately, since the critical pressures reported for the polymorphic transitions in HEAs are mostly around 20 GPa or below, a large-volume press (LVP) with approx. 1000 times larger sample volumes than DACs under similar pressure conditions (typically <25 GPa) [ 73 ] could be used to synthesize millimeter or centimeter-sized HEAs readily for various properties characterization. Very recently, Yu et al used a 10-MN double-stage LVP and compressed Cantor’s alloy with a diameter of 1.5 mm and a height of 2 mm to 20 GPa [ 74 ].…”

Section: Conclusion and Outlooksmentioning

confidence: 99%

High-Pressure Induced Phase Transitions in High-Entropy Alloys: A Review

Zhang

Lou

Cheng

et al. 2019

Entropy

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High-entropy alloys (HEAs) as a new class of alloy have been at the cutting edge of advanced metallic materials research in the last decade. With unique chemical and topological structures at the atomic level, HEAs own a combination of extraordinary properties and show potential in widespread applications. However, their phase stability/transition, which is of great scientific and technical importance for materials, has been mainly explored by varying temperature. Recently, pressure as another fundamental and powerful parameter has been introduced to the experimental study of HEAs. Many interesting reversible/irreversible phase transitions that were not expected or otherwise invisible before have been observed by applying high pressure. These recent findings bring new insight into the stability of HEAs, deepens our understanding of HEAs, and open up new avenues towards developing new HEAs. In this paper, we review recent results in various HEAs obtained using in situ static high-pressure synchrotron radiation x-ray techniques and provide some perspectives for future research.

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Section: Conclusion and Outlooksmentioning

confidence: 99%

High-Pressure Induced Phase Transitions in High-Entropy Alloys: A Review

Zhang

Lou

Cheng

et al. 2019

Entropy

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“…In a wellconnected state, changes in the iron spin state in (Mg,Fe)O ferropericlase could influence the viscosity of the weak phase and manifest themselves as a higher-viscosity layer in the lower mantle (19). The transformation into a post-spinel assemblage (Mg-perovskite with periclase) reveals little interconnectivity between periclase grains (26). However, recent deformation the post-spinel assemblage suggest that periclase grains might become interconnected and weaken the assemblage at larger strains, and could lead to dramatic weakening.…”

Section: Mineralogy Of Earth's Lower Mantle and Post-perovskite Phasementioning

confidence: 99%

“…For example, thermal conductivity was determined to 1073 K (47), and sound velocity (53), electrical conductivity (60), and iron partitioning (37) were obtained only below~2700 K. In addition, most measurements at lower mantle P-T conditions were performed in a laser-heated diamond-anvil cell (DAC), with an intrinsically large temperature gradient and different sample geometries, which might be major sources of inconsistency for results reported by different groups. Advanced experiments with different heating techniques-such as multianvil apparatus with sintered-diamond cubes (26), resistance-heated DAC, or shockwaves-will help improve understanding of the nature of the bottom of the mantle that controls the dynamics and evolution of both mantle and core. Rheological properties of Mgperovskite will also be examined at deep lower mantle P-T conditions in the near future, with advanced experimental techniques using, for example, the rotational Drickamer apparatus (27), the Kawai-type deformation-DIA apparatus (78), and rotation DAC (79).…”

Section: Perspective: Challenges and New Viewsmentioning

confidence: 99%

Perovskite in Earth’s deep interior

Hirose

Sinmyo

Hernlund

2017

Science

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Silicate perovskite-type phases are the most abundant constituent inside our planet and are the predominant minerals in Earth's lower mantle more than 660 kilometers below the surface. Magnesium-rich perovskite is a major lower mantle phase and undergoes a phase transition to post-perovskite near the bottom of the mantle. Calcium-rich perovskite is proportionally minor but may host numerous trace elements that record chemical differentiation events. The properties of mantle perovskites are the key to understanding the dynamic evolution of Earth, as they strongly influence the transport properties of lower mantle rocks. Perovskites are expected to be an important constituent of rocky planets larger than Mars and thus play a major role in modulating the evolution of terrestrial planets throughout the universe.

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“…In generating pressure in the SD-KMA, repeated heating was applied up to 1000-1500°C to remove accumulated stress in the pressure cell; this is an important technique in generating extremely high pressure in an SD-KMA. [8] In the power-temperature relation at 0.4 MN ( ∼ 32 GPa), there is a clear anomaly associated with graphite-diamond conversion. This usually occurs at around 1000-1500°C.…”

Section: Heating At 15 Gpa In the Wc-kmamentioning

confidence: 95%

“…[8] The generation of a high temperature exceeding 3000°C is thus critical to enhance the study of mineral physics in the deep mantle. We believe that the SCDH can be used in an SD-KMA to generate the temperature of the lower mantle geotherm.…”

Section: Introductionmentioning

confidence: 99%

Semiconductor diamond heater in the Kawai multianvil apparatus: an innovation to generate the lower mantle geotherm

Yoneda

Xie

Tsujino

et al. 2014

High Pressure Research

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Semiconductor diamond is considered the best heater material to generate ultra-high temperatures in a Kawai cell. In two pioneering studies, a mixture of graphite and amorphous boron (or boron carbide, B 4 C) was converted to semiconductor diamond in the diamond stability field and was confirmed to generate 2000°C and 3500°C, respectively. Following these works, we synthesized a homemade boron-doped graphite block with fine machinability. With this technical breakthrough, we developed a semiconductor diamond heater in a smaller Kawai-type cell assembly. Here, we report the procedure for making machinable boron-doped graphite, and the performance of the material as a heater in a Kawai cell at 15 GPa using tungsten carbide anvils and at ∼ 50 GPa using sintered diamond anvils. Furthermore, we present a finite element simulation of the temperature distribution generated by a semiconductor diamond heater, which is much more homogeneous than that generated by a metal heater.

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Over 1 Mbar generation in the Kawai-type multianvil apparatus and its application to compression of (Mg0.92Fe0.08)SiO3 perovskite and stishovite

Cited by 56 publications

References 33 publications

High-Pressure Induced Phase Transitions in High-Entropy Alloys: A Review

High-Pressure Induced Phase Transitions in High-Entropy Alloys: A Review

Perovskite in Earth’s deep interior

Semiconductor diamond heater in the Kawai multianvil apparatus: an innovation to generate the lower mantle geotherm

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