RESEARCH ON CHEMISTRY AND PHYSICS OF INORGANIC SYSTEMS UNDER EXTREME HIGH PRESSURE AND TEMPERATURE.
Final rept., 1 May 60-31 Oct 65,
HARVARD COLL CAMBRIDGE MASS PRESIDENT AND FELLOWS
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Using the tetrahedral press and uniaxial press, experiments were carried out on SiO2, CaCO3, FeS2 and Al2SiO5. The quartz-coesite equilibrium was established at 350C and 23kb. Calcite and aragonite were synthesized from each other. The breakdown of marcasite to pyrite was determined as a function of pressure and temperature. The univariant point of the three polymorphs of Al2SiO5 was determined as 300C plus or minus 50C at 8kb plus or minus 0.05kb. Experiments to synthesize highly pure quartz were carried out at first in alloy steel autoclaves and finally in palladium cans within the autoclaves. The purity of the quartz is dependent both on the purity of the container and of the starting materials. High purity quartz impurities less than 10 ppm was grown in a palladium can from high-purity crystallized high-purity silica glass. Single crystals of alpha-AsS were synthesized from natural realgar, beta-AsS. The synthesized crystals are shown to be triclinic. Author
- Inorganic Chemistry
- Geology, Geochemistry and Mineralogy
- Solid State Physics