Laboratory of structural transformation in solid state materials

Head of the laboratory:

Doctor of sciences in physics and mathematics

professor Khidirov Irisali Gazievich

Office phone: (998-71)-289-34-64
e-mail: khidirov@inp.uz


The mains areas of investigations
    Phase transformations and crystal structures of interstitial alloys (carbides, nitrides of transition metals of the IV-V group and their hydrides), intermetallic compounds and their hydrides, superconducting ceramics and other ceramics.
    The laboratory hold leading positions in the world in investigating crystal structure and order-disorder phase transitions in interstitial alloys: carbides (Me-C), nitrides (Me-N), carbonitrides (Me-C-N), carbo- and –nitridohydrides, Me(1)-Me(2)- C, were Me - transition metals of the IV-V group of Periodic Table of the Elements. In these compounds the various types of the short-range and long-range orders, ordered and disordered anti-phase domains, stable and metastable phases can be formed by the effect of temperature and gamma - irradiation and they influence essentially on the combination properties. These problems are especially important for creation of materials with necessary service properties.

The methods of investigations

The laboratory have the neutron diffractometer, a multi purpose X-ray difractometer with high- and low-temperature device, the vacuum and air furnaces up to 2000 K, the reactor (the source of neutrons) with power 10 Mwt, the source of γ - rays. With the ultrasonic setups the correlation between structural characteristics and mechanical properties of materials was accomplished. Being less intensive, neutron diffraction method has principal advantage over the X-ray method in investigating compounds containing elements with close or quite different atomic numbers.


The fundamental results

It was shown that by synthesis of hydrogen-containing interstitial phases followed by removal of hydrogen out of a crystal lattice new metastable phases, induced by hydrogen, can be obtained which cannot be obtained by the ordinary way. Hydrogen must be removed at rather low temperatures, so that the crystal structure, which was previously stabilized by hydrogen, will not change.
A number of such new metastable phases induced by hydrogen were obtained by above mentioned method in Ti-N and Zr-N systems. The peculiarities of crystal structure of these metastable phases have been investigated.
It was found out the isotopical effect in distribution of hydrogen isotopes Н and D; it consists in that isotopes Н and D arrange over one type of tetrahedral interstices but with different coordinates z, that is the splitting of tetrahedral positions 2d into hydrogen (Н) and deuterium (D) ones is observed. It follows that in the ordered "layered" structure (sp. gr.P‾3m1 ) of the solid solutions TiNxHy/2Dy/2 two different isotopes of the same element can not be on one plane.
A number of new phases is found out in interstitial alloys and their crystal structures are determined. For the first time the ordered antiphase domains are found in interstitial alloys.
The phase transition from face-centered structure into double hexagonal close packing has been found and investigated in the solid solutions of rare-earth metals Ce, La, Nd and Pr. We showed the possibility of research of strongly oxidable in atmospheric air rare-earth metals and their alloys by means of neutron diffraction without using of complex vacuum technique.
It is found the phase transformations in the substation solid solutions of rare-earth metals, and a new highly –effective technology is proposed of the increasing of corrosion resistance of these alloys by means of using of the discovered phase transformations. The technology has turned out to be suitable even for the lightest metal Li.


Main works for 5 years
  • Khidirov I. Neutron diffraction study of isotopic effect in arrangement of hydrogen atoms in solid solutions in solid solutions of the Ti-N-H, Ti-N-D AND Ti-N-H-D systems. Chapter 2. PP. 13-36. Neutron Diffraction: Instruments, methodologies and applications. /Ed. Xinzhe Jin. - New York: Nova Science Publishers. USA, 2013. 86 p. Web site: www.novapublishers.com. Рис.1.
  • Khidirov I. Neutron diffraction study of self-crystallization self-curing and dehydrogenating products of powder crystals of rare-earth metals trihydroxides. // Journal of Crystallization Process and Technology, 2013.- v. 3, № 4. 12 p.
  • Хидиров И., Парпиев А. С. Нейтронодифракционное определение среднеквадратичного смещения атомов в кубическом карбиде титана TiCx в области гомогенности. Атомная энергия. 2013, т. 14, вып. 1, с. 105-106.
  • Хидиров И., Парпиев А. С. Нейтронографическое исследование карбида титана состава TiC0.33. Альтернативная энергетика и экология. 2013, № 2/2 (120), 42-44.
  • Хидиров И., Парпиев А. С. Нейтронографическое исследование образования упорядоченных антифазных доменов в кубическом карбиде титана TiC0.60. Кристаллография. 2013, том 58, № 3, с. 438–442.
  • Khidirov I. Chapter 8. Neutron diffraction study of hydrogen thermoemission phenomenon from powder crystals. Tn the book “Neutron diffraction”: ISBN: 978-953-51-0307-3. InTech-Open Access Company, 2012. PP. 155-178. Рис. 2. Site:
    http://www.intechopen.com/articles/show/title/neutron-diffraction-study-....
  • Хидиров И. Уточнение фазовой диаграммы системы Ti-N методом нейтронографии //Ж. неорганической химии. 2011.Т. 56. № 2. С. 337-342.
  • Khidirov I. Revision of the Ti-N Phase Diagram as Proved by Neutron Diffraction//Russian Journal of Inorganic Chemistry. MAIK "Nauka/Interperiodica" Pleiades Publishing. Ltd. Russian. Moscow. 2011. V. 56. no. 2. PP. 298-303. Site: SpringerLink// http://www.springerlink. com/openurl. asp?genre-=article&id=doi:10.1134/ S0036023611020100.
  • Хидиров И., Парпиев А. С. Раздельное определение амплитуды тепловых колебаний и статических искажений атомов в карбиде титана методом дифракции нейтронов//Кристаллография. 2011. Т. 56. № 3, с. 504-508.
  • Khidirov I., Parpiev A. S. Separate Determination of Amplitude of Thermal Vibrations and Static Atomic Displacements in Titanium Carbide by Neutron Diffraction// Crystallography reports. MAIK "Nauka/Interperiodica" Pleiades Publishing. Ltd. Russian. Moscow. 2011. V. 56. no. 3. PP. 498-502. Site: SpringerLink http://www.springerlink.com/ content/r622224hnr3554x2/
  • Khidirov I. Нейтронографическое изучение явления термоэмиссии из кристаллической решетки тригидроксида презиодима // Междунар. Ж. Альтернативная энергетика и экология. 2011. № 2. С. 16-19.
  • Хидиров И., Парпиев А. С. Температура дебая и статические смещения атомов в нестехиометрическом карбиде титана TiC0.70. Международный нучный журнал Альтернативной энергетики и экологии ” 2010. № 5. Стр. 31-34.
  • Khidirov I., Sotvoldiev D. I. Growing kinetics of the disordered antiphase domains in titanium carbohydride TiC0.50H0.21. Uzbek J. of Physics. 2010. № 4-6.
  • Khidirov I., Veziroglu T.N., Mukhtarova N.N., Veziroglu A. Phase transitions in oversaturated solid solution of nitrogen in the α-Zr obtained by using hydrogen termoemission// International Scientific J. for Alternative Energy and Ecology. 2009. № 2. S. 8-14.

Leading collaborators
  • doctor, prof., head of the laboratory

Khidirov I.
Phone:8-10-(99871)- 289-34-64

  • PhD, senior researcher
Kalanov M.
Phone: 8-10-(99871)- 289-26-74
  • PhD, senior researcher

Khamraeva R.
Phone: 99871- 289-26-74

  • junior researcher
Getmanskiy V.
Phone: 8-10-(99871)- 289-34-64
  • junior researcher

Rustamova V.
Phone: 99871- 289-34-64

  • junior researcher
Parpiev A.
Phone: 8-10-(99871)- 289-34-64
  • engineer

Rakhmanov S.
Phone: 99871- 289-34-64

  • руководитель инновационного проекта ИФА-2012-5-6
    «Создание технологической линии производства гидроударного насоса»

Ashrapov U.
Phone: 99871- 289-31-36

  • junior researcher
Ergashev X.
  • engineer

Aliev R.

  • engineer
Khaytmurzaev D.
  • engineer

Kanavalov A.

  • engineer
Ergashev S.
  • engineer

Khudayberganov B.

  • engineer
Gaipov G.
Our address:
Composition materials lLaboratory,
Institute of Nuclear Physics of Uzbek Ac. of Sc.,
Ulugbek, Tashkent,100214, Republic of Usbekistan,
Tel.: 8-10 (99871) -289-34-64
e-mail: khidirov@inp.uz; khidirovi@yandex.ru
Рис.1 Рис.2