The purpose of the present invention is to provide: a stishovite sintered polycrystal having high hardness and high toughness; and a method for producing the stishovite sintered polycrystal.
Stishovite's basic structural unit is an SiO6 octahedron.
Now the presence of stishovite is diagnostic evidence of a meteor impact when craters of unknown origin are examined.
Now the presence of coesite and stishovite is diagnostic evidence of a meteor impact when craters of unknown origin are examined.
Stishovite is classified as an oxide instead of a silicate like quartz because the structure of stishovite is identical to other oxide minerals.
Stishovite, the higher-pressure form, in contrast has a rutile-like structure where silicon is 6-coordinate.
Analysis of the quasicrystals revealed they were intermeshed with silicates and crystalline metals, with one quasicrystalline grain encased in a silica mineral called stishovite.
As a result, it becomes possible to produce a highly hard and highly tough stishovite sintered polycrystal having a Vickers hardness of 28 to 29 GPa and a fracture toughness of 10 to 16 MPam1/2.
Silicon, as a general rule, is in four-fold coordination in all minerals; an exception is a case like stishovite (SiO 2 , an ultra-high pressure quartz polymorph with rutile structure).
Silicon, as a general rule, is in four-fold coordination in all minerals; an exception is a case like stishovite (SiO2, an ultra-high pressure quartz polymorph with rutile structure)., p.
He added that part of the moganite had changed into the high-pressure SiO2 minerals stishovite and coesite, which he believes was most likely formed through heavy impact collisions on the Moon
He adds that part of the moganite had changed into the high-pressure SiO2 minerals stishovite and coesite, which he believes was most likely formed through heavy impact collisions on the Moon.
He adds that part of the moganite had changed into the high-pressure SiO2 minerals stishovite and coesite, which he believes was most likely formed through heavy impact collisions on the Moon
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
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