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Modern high-pressure-high-temperature methods, mainly developed within the last twenty years, have vastely extended the pressure-temperature-region for synthesis work from pressure of about 1000 atm. at temperatures up to 0 500 C twenty years aga to some 100000 atm. and temperatures weH above 0 4000 C today. Thus a broad promising /ield 0/ experimental research has been opened out for science and technology. An incentive to the development of these new experimental techniques has been the diamond synthesis which after it was first achieved in 1953/54 (Gen. EI. Comp.; Norton Comp.; ASEA) has...