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
{"title":"Structure, electrophysical, optical, and magnetic properties of composites (1-x)PbFe12O19–xPbTiO3","authors":"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","doi":"10.1007/s00339-024-08032-2","DOIUrl":null,"url":null,"abstract":"<div><p>This paper presents the results of studying the structural features and physical properties of two-component composites (1-<i>x</i>)PbFe<sub>12</sub>O<sub>19</sub>–<i>x</i>PbTiO<sub>3</sub>, obtained from pre-synthesized and mechanically activated powders. To control the physical properties of composites, in addition to changing the dopant (PbTiO<sub>3</sub>) 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 <i>x</i> = 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 (<i>D</i>) of the PbFe<sub>12</sub>O<sub>19</sub> component after mechanical activation decreased by more than a half, while the dislocation density (<i>ρ</i><sub><i>D</i></sub>) and the magnitude of microstrains (<i>ε</i>) 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 <i>E</i><sub>g</sub> 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 <i>C</i><sub>g</sub>(<i>T</i>) 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.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":null,"pages":null},"PeriodicalIF":2.5000,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Physics A","FirstCategoryId":"4","ListUrlMain":"https://link.springer.com/article/10.1007/s00339-024-08032-2","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
This paper presents the results of studying the structural features and physical properties of two-component composites (1-x)PbFe12O19–xPbTiO3, 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.
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.