Қазақ ұлттық қыздар педагогикалық университеті / Казахский национальный женский педагогический университет

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  • Некоторые метрики заблокированы вашими 
    Тип записи:Публикация,
    СИНТЕЗ И СТРУКТУРА МАНГАНИТА Bi 0.3 Dy 0.7 Mn 7 O 12
    Manganite with mixed complex oxides Bi 0.3 Dy 0.7 Mn 7 O 12 was synthesized by the furnace method. The Pechini method used urea as a complexing agent. The composition and structure of the synthesized manganite were determined experimentally. For the first time, the structure, the type of the syngony, the parameters of the unit cells, the x-ray diffraction density of the manganite were determined by X-ray phase analysis: a = 7.5472, b = 8.5244, c = 5.7836 A, V un.cell. = 372.090A 3 , Z = 4, ρ rad. = 7,120 g / cm 3 , ρ pyc. = 7.09 g / cm 3 . The pycnometric density was measured 5-6 times and the data were averaged. Toluene served as an indifferent fluid.
  • Некоторые метрики заблокированы вашими 
    Тип записи:Публикация,
    СТРУКТУРНЫЕ, ЭЛЕКТРОННЫЕ И МАГНИТНЫЕ СВОЙСТВАM n2CoZ(Al/Ga) ПРИ ЛЕГИРОВАНИИ ВАНАДИЕМ
    (2021-11-01)
    Абуова Фатима
    ;
    ;
    Абуова Айсулу
    ;
    Талгат Муратович Инербаев
    ;
    N. A. Merali
    Annotation In this paper, we investigate the structural, electronic, and magnetic properties of Mn2Co1-x VxZ Heysler alloys (Z = Ga, Al, and x = 0, 0.25, 0.5, 0.75, 1). It was found that as the vanadium concentration increases, the lattice parameters increase linearly. The Mn2CoGa and Mn2VGa compounds have a magnetization of 2.00 and 2.01 µB/f. u., respectively. Almost complete compensation of the magnetic moment was achieved for the Mn2Co1-x VxZ alloy (Z = Ga, Al) at x=0.5. This effect is explained by the ferrimagnetic ordering of the magnetic moments of Mn, V and Co ions. The substitution effect leads to a narrowing of the band gap for electronic states with spin down as 0≤ x≤ 0.5 increases. Further growth of x leads to a broadening of the band gap. When the magnetic moment is fully compensated in the studied systems (x=0.5), a region of reduced density of electronic states near the Fermi level is formed for electron states with spin down.