Structure, electrophysical, optical, and magnetic properties of composites (1-x)PbFe12O19–xPbTiO3

IF 2.5 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Applied Physics A Pub Date : 2024-11-12 DOI:10.1007/s00339-024-08032-2
Kamaludin Abdulvakhidov, Nurzod Yunusov, Salim Otajonov, Ravshan Ergashev, Zhengyou Li, Bashir Abdulvakhidov, Suleiman Kallaev, Aram Manukyan, Abeer Alshoekh, Marina Sirota, Alexander Soldatov, Alexander Nazarenko, Pavel Plyaka, Elza Ubushaeva, Harutyun Gyulasaryan
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Abstract

This paper presents the results of studying the structural features and physical properties of two-component composites (1-x)PbFe12O19xPbTiO3, obtained from pre-synthesized and mechanically activated powders. To control the physical properties of composites, in addition to changing the dopant (PbTiO3) concentration within the range of 0.2–0.8 in steps of 0.2, the method of mechanical activation (nanostructuring) was used. This method implies that the Bridgman anvils simultaneously apply a compressive force to the powder placed between them and produce a shear deformation by rotating the lower anvil. X-ray diffraction revealed a sharp decrease in the unit cell parameters of the dopant of the initial composition at x = 0.4, followed by a similarly sharp leap in the parameters of the hexagonal cell after mechanical activation. The dimensions of the coherent scattering regions (D) of the PbFe12O19 component after mechanical activation decreased by more than a half, while the dislocation density (ρD) and the magnitude of microstrains (ε) increased by more than an order of magnitude. It was found that the magnetic phase transition temperature of composites decreases by about 14 °C with increasing dopant concentration, and the nanostructuring of composites leads to a further decrease in the transition temperature by another 12–36 °C, depending on the dopant concentration. The band gap Eg of the nanostructured compositions increases by approximately 0.3 eV regardless of the dopant concentration. Using the impedance spectroscopy method, it has been discovered that the dependence of the grain capacitance Cg(T) in the temperature range of 150–350 °C has a bell-shaped form, which is explained in terms of Maxwell–Wagner polarization, where the relaxation is of the non-Debye type.

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(1-x)PbFe12O19-xPbTiO3 复合材料的结构、电物理、光学和磁学特性
本文介绍了由预合成粉末和机械活化粉末制备的双组分复合材料 (1-x)PbFe12O19-xPbTiO3 的结构特征和物理性质的研究结果。为了控制复合材料的物理性质,除了在 0.2-0.8 的范围内以 0.2 为单位改变掺杂剂(PbTiO3)的浓度外,还采用了机械活化(纳米结构)的方法。这种方法意味着布里奇曼砧同时对放置在两砧之间的粉末施加压缩力,并通过旋转下砧产生剪切变形。X 射线衍射显示,在 x = 0.4 时,初始成分中掺杂剂的单胞参数急剧下降,而在机械活化后,六方晶胞参数同样急剧跃升。机械活化后,PbFe12O19 成分的相干散射区尺寸(D)减小了一半以上,而位错密度(ρD)和微应变(ε)则增加了一个数量级以上。研究发现,随着掺杂剂浓度的增加,复合材料的磁性相变温度降低了约 14 °C,而复合材料的纳米结构会导致相变温度进一步降低 12-36 °C,具体取决于掺杂剂浓度。无论掺杂剂浓度如何,纳米结构复合材料的带隙 Eg 都会增加约 0.3 eV。利用阻抗光谱法发现,晶粒电容 Cg(T) 在 150-350 ℃ 的温度范围内呈钟形变化,这可以用 Maxwell-Wagner 极化来解释,其中的弛豫属于非德拜类型。
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来源期刊
Applied Physics A
Applied Physics A 工程技术-材料科学:综合
CiteScore
4.80
自引率
7.40%
发文量
964
审稿时长
38 days
期刊介绍: Applied Physics A publishes experimental and theoretical investigations in applied physics as regular articles, rapid communications, and invited papers. The distinguished 30-member Board of Editors reflects the interdisciplinary approach of the journal and ensures the highest quality of peer review.
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