Phase Transformations in Titanium Oxycarbide TiC_0.545O_0.08

M. Yu. Tashmetov*, V. T. Em*, B. N. Savenko**, and G. Batdemberel***

* Institute of Nuclear Physics, Academy of Sciences of Uzbekistan, Tashkent, 702132 Uzbekistan

e-mail: savenko@nfsun1.jinr.ru

** Joint Institute for Nuclear Research, Dubna, Moscow oblast, 141980 Russia

*** Institute of Physics and Technology, Mongolian Academy of Sciences, Ulan Bator, Mongolia

Received February 17, 1999; in final form, April 18, 2002

Abstract—Phase transformations in titanium oxycarbide TiC_0.545O_0.08 have been studied by the methods of
neutron diffraction and X-ray structure analysis. It was established that the ordered cubic structure '
(sp.gr.Fd3m) of the oxycarbide sample is the low-temperature ordered phase existing up to 990 K. The order–
disorder phase transition (990 K) results in the formation of an ordered trigonal structure (sp. gr. or
P3₁21). The -Ti-phase is separated at the temperature 1020 K. The order–disorder phase transition was found
at T = 1040 K. © 2003 MAIK “Nauka/Interperiodica”.

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