Phone (+994 12) 5392135  
Fax  
E-mail yusifasadov@rambler.ru  
Chief  Dr. in physics and mathematics Asadov Yusif Gazanfar oglu 
Total number of employees 13 
Basic activity directions  

The study of cristall structure and phase transformations in semiconductors

Main scientific achievements 

1.Ternary compound Cu4SSe has been first synthesized for first time by alloying Cu, S, and Se elements taken in stoichiometric ratios. X-ray diffraction study of polycrystalline samples has revealed the synthesized material to be crystallized into the trigonal system with unit-cell parameters а = 4.021(1) Å, с = 6.838(1) Å, and V = 95.75(4) Å3; sp. gr. P3m1; Z = 1; D x = 6.333(3) g/cm3. The crystal structure has been solved and refined to the reliability factor RBragg = 0.40%.

2.A solid solution of the GaIn3Se6 (2Ga0.5In1.5Se3) composition with a hexagonal lattice (a = 7.051(3) Å, c = 19.148(2) Å, sp. gr. P61, z = 6, V = 824.4332(4) Å3 , ρ = 5.379(2) g/cm3 ) has been synthesized as a result of alloying Ga, In, and Se elements with a metal ratio of 1: 3. It was established that six out of nine In atoms in the lattice are located in a trigonal bipyramid, while the other three In atoms and three Ga atoms have a tetrahedral coordination.

3.The solid solution of Cu4Te1.5Se0.5 is synthesized. By roentgenographic method it is established that Cu4Te1.5Se0.5 samples crystallize in trigonal structure with lattice periods in hexagonal establishment: аh=8,2319(11) Å, сh=21,4145(23) Å, V=1089,811(12) Å 3 , sp.gr. Р3m1, Z=22, x=7,33 gr/сm 3 . By comparative roentgen-phase analysis of temperature diffraction data it is established that trigonal phase of Cu4Te1.5Se0.5 at room temperature transits at Т=7503К into two-phase system consisting of hexagonal phase of Cu2Te0.5Se0.5 composition with periods а=4,231 Å, с=7,223Å; sp.gr. P63 /mmc and cubic phase of Cu2Te composition with а = 6,049 Å periods. It is shown that near T=800K5К the two-phase system transits into unique cubic phase with periods а=6.061 Å.

4.The new electron-diffration methods have been worked out by M.G.Kyazumov which are having irreplaceable advantages in studying of crystal structures and thin structures of monocrystal films, nanoparticles, nanopipes and etc. Applying these methods it can be possible to gather on Evald's plane the knots of any part of a reciprocal lattice and then using simple Pifagor's formulas it becomes easy to deciphered reflexes.