Қазақ ұлттық қыздар педагогикалық университеті / Казахский национальный женский педагогический университет

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Язык: search.filters.language.АнглийскийТема: search.filters.subject.lattice parameters

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    Synthesis and X-Ray Analysis of Complex Ferrites
    (Trans Tech Publications, 2017-07-01)
    Mukhametkali Musagalievich Mataev
    ;
    Moldir Rashidovna Abdraimova
    ;
    Siddharth Saxena
    ;
    D. Z. H. Nuketaeva
    ;
    B.T. Zheksembieva
    Ferrite with mixed complex oxides BiNaFe2O5, BiKFe2O5 was synthesized by high temperature solid state reaction. The structure of the ferrites, type of syngony, parameters of the unit cells, radiographic and pycnometric densities were determined by X-ray phase analysis for a first time: BiNaFe2O5 – а=5,577, с=13,86 Å, γ=120º, Vun.cell. = 373,9 Å3, Z=4, ρrad.= 7,5262 г/см3, ρpicn.=7,5271 г/см3, BiKFe2O5 –а=5,545, с=13,65 Å, γ=120º, Vun.cell.= 363,45Å3, Z=6, ρrad.= 8,0367, ρpicn.=8,0375 г/см3. A comparative analysis of the relationship between crystal lattice parameters with parameters of the crystal lattice of initial oxides and complex ferrites has been performed. Research dependence of the magnetic moment of the complex ferrite BiNaFe2O5 of the applied magnetic field at a constant temperature T = 6.1405 K showed a paramagnetic shift in the structure.
    Цитирования (OpenAlex) 3Цитирования (OpenCitations) 3
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    Synthesis and Magnetic Properties of Crystals Bi₂BaFe₄O₁ ₀
    (2018-08-01)
    Mataev Mukhametkali M.
    ;
    Gennady Semenovich Patrin
    ;
    Moldir Rashidovna Abdraimova
    ;
    Zhanar Yliasovna Tursinova
    ;
    Yurkin Gleb Yu.
    The paper presents the results of an experimental study of the first synthesized compound in the system Bi2O3-BaO-Fe2O3.It was found that the compound has cubic symmetry, the lattice parameters was determined.Electron microscopy measurements reveal that, in general, elemental composition of different parts of the samples corresponds to Bi2BaFe4O10 formula.According to magnetic measurements, the compound has a magnetic order with the magnetic ordering temperature TC = 700 K.
    Цитирования (OpenAlex) 3Цитирования (OpenCitations) 3
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    Structural, Electronic and Magnetic Properties of Mn2Co1-xVxZ (Z = Ga, Al) Heusler Alloys: An Insight from DFT Study
    (Multidisciplinary Digital Publishing Institute, 2021-12-08)
    Fatima U. Abuova
    ;
    Талгат Муратович Инербаев
    ;
    Aisulu U. Abuova
    ;
    N. A. Merali
    ;
    Nurgul S. Soltanbek
    Structural, electronic, and magnetic properties of Mn2Co1-xVxZ (Z = Ga, Al, x = 0, 0.25, 0.5, 0.75, 1) Heusler alloys were theoretically investigated for the case of L21 (space group Fm3¯m), L21b (L21 structure with partial disordering between Co and Mn atoms) and XA (space group F4¯3m) structures. It was found that the XA structure is more stable at low V concentrations, while the L21 structure is energetically favorable at high V concentrations. A transition from L21 to XA ordering occurs near x = 0.5, which qualitatively agrees with the experimental results. Comparison of the energies of the L21b and XA structures leads to the fact that the phase transition between these structures occurs at x = 0.25, which is in excellent agreement with the experimental data. The lattice parameters linearly change as x grows. For the L21 structure, a slight decrease in the lattice constant a was observed, while for the XA structure, an increase in a was found. The experimentally observed nonlinear behavior of the lattice parameters with a change in the V content is most likely a manifestation of the presence of a mixture of phases. Almost complete compensation of the magnetic moment was achieved for the Mn2Co1-xVxZ alloy (Z = Ga, Al) at x = 0.5 for XA ordering. In the case of the L21 ordering, it is necessary to consider a partial disorder of atoms in the Mn and Co sublattices in order to achieve compensation of the magnetic moment.
    Цитирования (OpenAlex) 13Цитирования (OpenCitations) 10
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    Multifaceted Characterization and Thermal Stability of Y0.5Sr0.5Cr0.5Mn0.5O3 Chromite-Manganite Synthesized via Sol-Gel
    (2024-01-01)
    Karima Seitbekova
    ;
    Marzhan Nurbekova
    ;
    Mukhametkali Matayev
    ;
    Zamira Sarsenbaeva
    ;
    Zhadyra Durmenbayeva
    We studied the thermal stability and many-sided properties of Y 0 .5 Sr 0 .5 Cr 0 .5 Mn 0 .5 O 3 chromite-manganite that was made using the sol-gel method.We focused on the syngony type, unit cell parameters, and x-ray analysis.To con􀅫irm the results of the chromite-manganite indexing, the inverse values of the squares of interplane distances (104/d2) and the consistency of the x-ray and pycnometric densities were found to be very close to each other.It was found that the synthesised chromite-manganite crystallises in orthorhombic syngony and has a perovskite-like structure.Scanning Electron Microscopy (SEM) shows that chromite-manganite is uniformly distributed, and the crystallites are sized between 6 and 20 microns.The analysis of the relationship between heat capacity and temperature using the Thermo Gravimetry Analysis (TGA) technique demonstrates the stability of the internal structure and the presence of polymorphic transformations in the sample under study.