Abstract

The features of the composition, crystal, and magnetic structure of Ti-substituted barium hexaferrite BaFe_12 – xTi_xO₁₉ (0.25 ≤ x ≤ 1.5) are studied by Mössbauer spectroscopy, vibration magnetometry, X-ray diffraction, and simultaneous thermal analysis. Bounded heterovalent isomorphism implemented by the scheme 2Fe³⁺ → Ti⁴⁺ + Fe²⁺ while retaining the charge balance is established when Fe³⁺ ions are partially substituted with Ti⁴⁺ ions. An increase in the 3d-electron density and the presence of Fe²⁺ in BaFe_12 – xTi_xO₁₉ samples with x = 1.5 is detected by Mössbauer spectroscopy. The heterovalent isomorphic substitution limit is determined to be within 0.75 < x < 1.0. Using Mössbauer spectroscopy and X-ray diffraction, the formation of titanium-contained phases at x = 1.0 whose content increases with the degree of substitution is shown. The data on the preferential distribution of substituent ions (Ti⁴⁺) in the barium hexaferrite structure at the 12k and 2b sites are presented.

中文翻译：

---

钡铁氧体BaFe 12 – x Ti x O 19的组成，磁性和晶体结构特征研究

摘要

该组合物，晶体，和磁结构的特征的Ti-取代的钡铁氧体钡铁氧体_{12 -  X}的Ti _X ø ₁₉（0.25≤ X ≤1.5）通过穆斯堡尔谱，振动磁力，X射线衍射，并同时热分析进行了研究。当Fe ³⁺离子被Ti ⁴⁺离子部分取代时，在保持电荷平衡的同时，通过方案2Fe ³⁺ →Ti ⁴⁺ + Fe ²⁺实现了有界的杂种同构。BaFe _{12 – x中}3 d-电子密度的增加和Fe ²⁺的存在 用穆斯堡尔光谱法检测x = 1.5的Ti _x O ₁₉样品。杂合同构取代极限被确定为在0.75 < x <1.0之内。使用穆斯堡尔光谱法和X射线衍射，显示出x = 1.0时含钛相的形成，其含量随取代度的增加而增加。给出了在钡铁氧体结构中12 k和2 b位的取代离子（Ti ⁴⁺）优先分布的数据。