BARS (or "split sphere", transliteration from Russian: БАРСabbreviation of Russian: Беспрессовая Аппаратура Высокого Давления «РАЗРЕЗНАЯ СФЕРА», (bespressovaya apparatura vysokogo davleniya «razreznaya sfera»), "press-free high-pressure setup «split sphere»") a high-pressure high-temperature apparatus usually used for growing or processing minerals, especially diamond and boron nitride.[1] Typical pressures and temperatures achievable with BARS are 10 GPa (99,000 atm) and 2,500 °C (4,530 °F; 2,770 K).[2][1]
Schematic of a BARS system.Pressure chamber.Two BARS devices, one open for loading or unloading and the other closed.
The BARS technology was invented around 1989–1991 by the scientists from the Institute of Geology and Geophysics of the Siberian Branch of the Academy of Sciences of the USSR.[2] In the center of the device, there is a ceramic cylindrical reaction cell of about 2 cm3 in size. The cell is placed into a cubic-shaped pressure-transmitting material, which is pressed by elements made from cemented carbide (VK10 hard alloy).[3] The outer octahedral cavity is pressed by 8 steel sectors. After mounting, the whole assembly is locked in a disc-type barrel with a diameter ~1 meter. The barrel is filled with oil, which pressurizes upon heating; the oil pressure is transferred to the central cell. The central cell is heated up by a coaxial graphite heater. Temperature is measured with a thermocouple. The exterior size is 2.2 х 1.0 х 1.2 meters. Weight of the sphere is 2.8 tonnes (6,200 lb). Claimed energy consumption is in between 1.5 - 2 kWh.[4]
The growth rate for 5 carats (1.0 g) type Ib (yellow, nitrogen-rich) crystals using Fe–Ni catalyst reaches as high as ~20 mg/h towards the end of 100 h growth cycle, i.e. crystals of 5 carats (1.0 g) to 6 carats (1.2 g) can be grown in less than 100 h.[5]
^ ab"Беспрессовая аппаратура высокого давления "РАЗРЕЗНАЯ СФЕРА" (БАРС)". www.igm.nsc.ru (in Russian). Retrieved 2018-05-16.
^ abN. Pal'yanov; et al. (2002). "Fluid-bearing alkaline carbonate melts as the medium for the formation of diamonds in the Earth's mantle: an experimental study". Lithos. 60 (3–4): 145. Bibcode:2002Litho..60..145P. doi:10.1016/S0024-4937(01)00079-2.
^M. G. Loshak and L. I. Alexandrova (2001). "Rise in the efficiency of the use of cemented carbides as a matrix of diamond-containing studs of rock destruction tool". Int. J. Refractory Metals and Hard Materials. 19: 5. doi:10.1016/S0263-4368(00)00039-1.
^"Беспрессовая аппаратура высокого давления "РАЗРЕЗНАЯ СФЕРА" (БАРС)". www.igm.nsc.ru (in Russian). Retrieved 2018-05-16. оптимальные габариты (2,2 х 1,0 х 1,2 м) и масса установки (2,8 т); высокая экологичность и безопасность; низкая энергоемкость (1,5 - 2 квт/час); заменяемость многопуансонного блока в зависимости от задач
^R. Abbaschian; et al. (2005). "High pressure–high temperature growth of diamond crystals using split sphere apparatus". Diam. Relat. Mater. 14 (11–12): 1916. Bibcode:2005DRM....14.1916A. doi:10.1016/j.diamond.2005.09.007.
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Wikimedia Commons has media related to Synthetic Diamond.
Pressless High-Pressure Equipment “SPLIT SPHERE" 2011-07-20 at the Wayback Machine
November 28, 2023
bars, apparatus, bars, split, sphere, transliteration, from, russian, БАРС, abbreviation, russian, Беспрессовая, Аппаратура, Высокого, Давления, РАЗРЕЗНАЯ, СФЕРА, bespressovaya, apparatura, vysokogo, davleniya, razreznaya, sfera, press, free, high, pressure, s. BARS or split sphere transliteration from Russian BARS abbreviation of Russian Bespressovaya Apparatura Vysokogo Davleniya RAZREZNAYa SFERA bespressovaya apparatura vysokogo davleniya razreznaya sfera press free high pressure setup split sphere a high pressure high temperature apparatus usually used for growing or processing minerals especially diamond and boron nitride 1 Typical pressures and temperatures achievable with BARS are 10 GPa 99 000 atm and 2 500 C 4 530 F 2 770 K 2 1 Schematic of a BARS system Pressure chamber Two BARS devices one open for loading or unloading and the other closed The BARS technology was invented around 1989 1991 by the scientists from the Institute of Geology and Geophysics of the Siberian Branch of the Academy of Sciences of the USSR 2 In the center of the device there is a ceramic cylindrical reaction cell of about 2 cm3 in size The cell is placed into a cubic shaped pressure transmitting material which is pressed by elements made from cemented carbide VK10 hard alloy 3 The outer octahedral cavity is pressed by 8 steel sectors After mounting the whole assembly is locked in a disc type barrel with a diameter 1 meter The barrel is filled with oil which pressurizes upon heating the oil pressure is transferred to the central cell The central cell is heated up by a coaxial graphite heater Temperature is measured with a thermocouple The exterior size is 2 2 h 1 0 h 1 2 meters Weight of the sphere is 2 8 tonnes 6 200 lb Claimed energy consumption is in between 1 5 2 kWh 4 The growth rate for 5 carats 1 0 g type Ib yellow nitrogen rich crystals using Fe Ni catalyst reaches as high as 20 mg h towards the end of 100 h growth cycle i e crystals of 5 carats 1 0 g to 6 carats 1 2 g can be grown in less than 100 h 5 See also editSynthetic diamond Material properties of diamond Crystallographic defects in diamond Diamond color Diamond enhancement DiamondReferences edit a b Bespressovaya apparatura vysokogo davleniya RAZREZNAYa SFERA BARS www igm nsc ru in Russian Retrieved 2018 05 16 a b N Pal yanov et al 2002 Fluid bearing alkaline carbonate melts as the medium for the formation of diamonds in the Earth s mantle an experimental study Lithos 60 3 4 145 Bibcode 2002Litho 60 145P doi 10 1016 S0024 4937 01 00079 2 M G Loshak and L I Alexandrova 2001 Rise in the efficiency of the use of cemented carbides as a matrix of diamond containing studs of rock destruction tool Int J Refractory Metals and Hard Materials 19 5 doi 10 1016 S0263 4368 00 00039 1 Bespressovaya apparatura vysokogo davleniya RAZREZNAYa SFERA BARS www igm nsc ru in Russian Retrieved 2018 05 16 optimalnye gabarity 2 2 h 1 0 h 1 2 m i massa ustanovki 2 8 t vysokaya ekologichnost i bezopasnost nizkaya energoemkost 1 5 2 kvt chas zamenyaemost mnogopuansonnogo bloka v zavisimosti ot zadach R Abbaschian et al 2005 High pressure high temperature growth of diamond crystals using split sphere apparatus Diam Relat Mater 14 11 12 1916 Bibcode 2005DRM 14 1916A doi 10 1016 j diamond 2005 09 007 External links edit nbsp Wikimedia Commons has media related to Synthetic Diamond hpht high pressure high temperature Pressless High Pressure Equipment SPLIT SPHERE Archived 2011 07 20 at the Wayback Machine Synthetic threat to gem quality diamonds Retrieved from https en wikipedia org w index php title BARS apparatus amp oldid 1176247915, wikipedia, wiki, book, books, library,
