Abstract
Abstract. In this paper, the effect of Al3+ ions substitutions on the value of the effective magnetic anisotropy field НАeff and the degree of magnetic texture f of the anisotropic polycrystalline hexagonal barium and strontium ferrites were studied. The samples were obtained by the ceramic technology method and the texture was formed by pressing in a magnetic field. The sample preparation technology presented in detail. The batches of barium hexaferrites were synthesized with the concentration of Al3+ ions: 0.9; 1.4; 2.5 and 2.6 formula units while strontium hexaferrites had Al3+ concentration of 0.1 formula units. It has been shown that by this technology barium and strontium hexaferrites with high value of (in range of 19—35 kOe) and with f = 80—83% could be obtained. The achieved values of НАeff and f could be sufficient for the production of substrates for microstrip microwave devices in millimeter−wave region.For the first time a raise in the degree of magnetic texture of polycrystalline barium hexaferrites with an increase of concentration of Al3+ ions were detected; a slight (5.5—5.8%) magnetic texture of isotropic strontium hexaferrites was also detected. The achieved results discussed in detail. For studied hexaferrites the mechanism of magnetic texture formation during the process of synthesis is proposed.
Highlights
The samples were obtained by the ceramic technology method and the texture was formed by pressing in a magnetic field
The batches of barium hexaferrites were synthesized with the concentration of Al3+ ions: 0.9; 1.4; 2.5 and 2.6 formula units while strontium hexaferrites had Al3+ concentration of 0.1 formula units
Г. Метрологическое обеспечение разработок ферритовых материалов для сантиметрового и миллиметрового диапазонов длин волн / Электроника и микроэлектроника СВЧ
Summary
Объектами исследования в работе являлись сложнозамещенные поликристаллические гексагональные ферриты бария и стронция с индуцированной магнитной текстурой. 1. В качестве исходного сырья для гексаферрита стронция использовали оксида железа Fe2O3 марки «ч.д.а» ТУ 6−09−5346−87, оксид алюминия Al2O3 марки «ч.д.а.». Карбонат стронция при температуре 1100—1200 °С разлагается на оксид стронция SrO и углекислый газ CO2. Для бариевого гексаферрита в качестве исходного сырья использовали: оксид железа Fe2O3 марки «ч.д.а» ТУ 6−09−5346−87, оксид алюминия Al2O3 марки «ч.д.а.». 2. Внешний вид пресса (а) и пресс−формы (б) для получения сырых заготовок анизотропных гексаферритов: б: 1 — матрица; 2 — верхний пуансон; 3 — нижний пуансон; 4 — фетровый фильтр; 5 — фильтр из х/б бязи; 6 — распрессовочное кольцо Fig. 2. Химический состав и особенности технологии получения сложнозамещенных поликристаллических анизотропных гексагональных ферритов бария и стронция [Chemical composition and features of technology for producing complex polycrystalline anisotropic hexagonal barium and strontium ferrites]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
