The phase components of Fe-Al-C alloys as quenched in water from melting temperature as received  by melting under high pressure (7,2 GPa) have been investigated by x-ray method. It is established the presence of diamond phase in the samples which received by thermal and high pressure treatment by means of using of the monochromatic Fe _Ka1-x-ray irradiation. The results of x-ray study by using monochromatic Cu_Ka1-irradiation allow to conclude that the distortions of diamond crystal lattice are absent. It was defined that K-phase (carbide), independently from method of alloy receiving, did not correspond to stoichiometric structure Fe₃AlC. Its formula can be represented as Fe_4-y-Al_y-C_0,66. The diamond powder, received by dissolving of sample in acid mixture, has been investigated. The x-ray patterns obtained in Fe-irradiation have shown clear and untailed reflections of diamond phase. All the data allow unambiguously identify the diamond and confirm the possibility of receiving of the synthetic diamond powders from Fe-Al-C alloys.

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1. Electronic structure of diamond-formating Me-Al-C alloys
2. SEM investigation of Fe-Al-C alloys after thermal and high pressure influence
3. Architecture and Electronic Structure of K-Phase in Fe-Al-C Alloys