Journal ArticleDOI
Ultrahigh pressure apparatus using cemented tungsten carbide pistons with sintered diamond tips
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TLDR
In this article, a Drickamer-type apparatus was made in which the highly-stressed tip regions of the Carboloy pistons are of dense sintered diamond and the results showed that this apparatus is capable of attaining static pressures of over 400 kilobar on a newly revised scale.Abstract:
A Drickamer‐type apparatus has been made in which the highly‐stressed tip regions of the Carboloy pistons are of dense sintered diamond. Experiments indicate that this apparatus is capable of attaining static pressures of over 400 kilobar on a newly revised scale. The results show that the 1970 revised pressure scale of Drickamer needs further revision downwards for the range above about 150 kilobar. A pressure scale based on electric resistance transitions up to 400 kilobar is proposed. Resistance vs press force curves are shown for Bi, Fe20Co, Fe40Co, CdS, GaP, BP, NaCl, and graphite.read more
Citations
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Journal ArticleDOI
Sintered superhard materials.
TL;DR: The sintered masses are produced on a commercial scale and are increasingly used as cutting tools on hard or abrasive materials, as wire-drawing dies, in rock drills, and in special high-pressure apparatus.
Book ChapterDOI
Chapter 3 Structural Transitions in the Group IV, III-V, and II-VI Semiconductors under Pressure
R.J. Nelmes,M.I. McMahon +1 more
TL;DR: In this article, structural transitions in the group IV, III, V, and II-VI semiconductors under pressure are discussed. But the resolution of EDX powder patterns is limited to that of the solid-state detector.
Journal ArticleDOI
Synthesis and crystal-chemical characterization of MgSiO3 perovskite
Eiji Ito,Yoshito Matsui +1 more
TL;DR: The orthorhombic MgSiO3 perovskite has been synthesized with the aid of a double-stage split-sphere-type high-pressure apparatus at about 280 kbar and 1000°C.
Journal ArticleDOI
High pressure phase transitions in tetrahedrally coordinated semiconducting compounds
S. C. Yu,I.L. Spain,E.F. Skelton +2 more
TL;DR: In this paper, the experimental results for structural transition at high pressure in several III-V compounds and two II-VI compounds were reported, together with the predictions of model calculations of Van Vechten.
Journal ArticleDOI
Post-garnet transitions in the system Mg4Si4O12–Mg3Al2Si3O12 up to 28 GPa: phase relations of garnet, ilmenite and perovskite
Atsushi Kubo,Masaki Akaogi +1 more
TL;DR: In this paper, phase transitions in Mg3Al2Si3O12 garnet (pyrope) were examined at 23-28 GPa and 1600-2000°C using a 6-8-type multianvil apparatus.
References
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Journal ArticleDOI
Hexagonal Diamond—A New Form of Carbon
F. P. Bundy,J. S. Kasper +1 more
TL;DR: In this article, a new crystalline form of carbon, hexagonal diamond, has been synthesized in the laboratory under conditions of static pressure exceeding about 130 kbar and temperature greater than about 1000°C.
Journal ArticleDOI
Quantum Dielectric Theory of Electronegativity in Covalent Systems. III. Pressure-Temperature Phase Diagrams, Heats of Mixing, and Distribution Coefficients
TL;DR: In this paper, a two-band model was proposed to describe and predict the ionization potentials and electronic interband gaps of binary compounds and their alloys, and a revised method of calculating the excess heat of mixing of a substitutional alloy was presented.
Journal ArticleDOI
Infrared Studies in the 1- to 15-Micron Region to 30,000 Atmospheres.
TL;DR: Major spectral changes are not observed in the same pressure ranges in other carbonates having the calcite or aragonite structures, and the results for calcite may be explained by a shift of the CO3= ion from the trigonal axis under pressure.
Journal ArticleDOI
Pressure-volume relationship and pressure-induced electronic and structural transformations in Eu and Yb monochalcogenides
TL;DR: In this paper, pressure-volume relationships for EuSe, EuS, YbSe and YbS have been obtained from high-pressure x-ray-diffraction studies to nearly 300 kbar.
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