SYNTHESIS AND X-RAY ANALYSIS OF COMPLEX FERRITE BILIFE2O5

М.М. Mataev 1 , М.R. Abdraimova 1,* , S.М.Saxena 2 , D.Zh.Nuketaeva 1 , Zh.I.Tursinova 1 and H.Hamidov 3 . 1. Kazakh State Women`s Teacher Training University, Almaty, Kazakhstan. 2. University of Cambridge, Cambridge. 3. National university of Uzbekistan, Tashkent. ...................................................................................................................... Manuscript Info Abstract ......................... ........................................................................ Manuscript History

Semiconductor materials, which functionality is stipulated by electron charge are generally used in modern electronics. Increasing requirements to electronic devices expose the problem of search and implementation of alternative materials, working on non-classical principles. The basis of future electronic can become spintronics devices that use both electron charge and its spin [1].
Spintronics became known after opening the effect of discovery of "giant" magnetoresistance (GMR), which is stipulated by different scattering on ferromagnetic impurities of two groups of electrons' spins with "up" and "down". This selection requires the significant difference between the average lengths of free path of the electrons with "up" and "down" directions of the spins. This occurs in ferromagnetic materials characterizing by differences in the density of the free states of electrons caused by exchange splitting of 3d zone. This principle lays in the basis of magnetoresistive devices implementing the effects of the giant and tunnel magnetoresistance [2].
Literature data analysis shows that ortoferrites BiFeO 3 or socalled multiferroics are the most studied of ferrities that simultaneously have the electric polarization and magnetic ordering. The ortoferrites are prospective for implementation as the working environment in the data storage and processing devices. At the present time, the search of new materials with ferroelectric properties and specific electronic and magnetic structures is performed using the most famous multiferroic for. Substituted perovskites based on the bismuth ferrites often combine ferroelectric and weak ferromagnetic properties with the dominant antiferromagnetic ordering [2,3].
This study is to investigate the conditions for obtaining and X-ray features of new classes of complex mixed bismuth ferrites, in which Bi+3 is partially substituted by the ions of rare-earth elements and sodium. 716 New polycrystalline complex of bismuth ferrites were synthesized by ceramic processing technology. Bismuth oxide (III) (mark "chemically pure"), lithium carbonate (mark "highly-pure") and iron oxide (III) (mark "chemically pure") were used as the initial components. Solid-phase synthesis was carried using the thermal data of the initial components taking into account Tamman conditions for ceramic reactions [4,5]. Stoichiometrically calculated mixtures of initial components preliminary annealed in a muffle furnace at 400ºС for one hour, were thoroughly stirred and the calculated mixture of the starting components are thoroughly mixed and grinded in an agate mortar, placed in an alundum crucibles, and annealed in a silite furnace. Annealing was performed by two stages: first stage at 600ºС for 48 h and second stage at 800ºС for 20 h [6].
Formation of new phases was controlled by X-ray scattering analysis performed using the radiologic diffractometer X-ray MiniFlex 600 (Rigaku). The conditions of analysis included: CuKɑradiation, Nifilter, U=40 kV, I=10 mA, rotation rate -1000 impulses/s, and time constant τ =5 s, 2θ = 10° -90°. Diffraction peaks were evaluated using hundredpoint scale. Radiographs of the synthesized polycrystalline powders were indexed by the homology method (homologue is distorted structure type of perovskite) [7]. Pycnometric density of manganites was determined by the method described in [8]. Toluene served as indifferent liquid. The density of each ferrite was measured 4 -5 times and the data were averaged. Table below shows the results of indexing of radiographs of ferrites. In a [ Table 1] shows the results of X-ray indexing ferrites.
The correctness of the results of the ferrite indexing confirmed the good agreement of the experimental and calculated values of the reciprocals of the squares of the distances between planes (10 4 /d 2 ), consistency of values of X-ray and pycnometric densities.