X-Ray Structural Determination of a Multilayered Magnetic Dielectric Ceramic Ba42Ti51Fe20O174 in the BaO–TiO2–Fe2O3 System

Nassif, Vivian; Carbonio, R. E.; Hodeau, Jean-Louis; Dooryhée, E.

doi:10.1006/jssc.2002.9614

Cited by 4 publications

(1 citation statement)

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“…With the increase of milling time leading to introduction of Fe into the BTO structure, barium titanate changes its crystallinity by moving from local orthorhombic and tetragonal to predominantly cubic symmetry due to the influence of size of crystalline grains [24]. [25,26] on BFTO systems of similar constituent mass ratios [27]. The crystalline grains are larger in the sample activated for 60 min compared to the ones found in the sample activated for 30 min, after which a decrease in size occurs and the minimum for the activation time of 240 min is reached (Tab.…”

Section: Resultsmentioning

confidence: 99%

Evolution of structural and functional properties of the Fe/BaTiO3 system guided by mechanochemical and thermal treatment

et al. 2020

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Multiferroic systems are attractive to the researches worldwide due to diversity of existing applications, as well as possible novel ones. In order to contribute to understanding of the processes that take place within the structure of such a system, we subjected it to mechanochemical activation and thermal treatment. Powdery mixtures of iron and barium titanate in a mass ratio of 30% Fe and 70% BaTiO3 were activated in a planetary ball mill for time duration of 30 to 300 min and subsequently sintered at 1200?C in the atmosphere of air. During the activation the system undergoes structural phase transitions, whereby the content of iron and its oxides changes. The highest Fe content was observed in the sample activated for 270 min, with local maxima in crystallite size and microstrain values and a minimum in dislocation density. The complex dielectric permittivity changes in the applied radio frequency field, rangingfrom 176.9 pF/m in thesample activated for 90 min to 918.1 pF/m in the sample activated for 180 min. As the frequency of the field increases, an exponential decrease in the magnetic with a simultaneous increase in the electrical energy losses is noticeable. The system exhibits ferromagnetic resonance, whereby longer activation in the mill shifts the resonant frequency to higher values. Negative electrical resistance was observed in all analyzed samples. The activation time changes both the demagnetization temperature and the Curie temperature of the samples undergoing heating and cooling cycles in the external permanent magnetic field. Curie temperature is the highest in the sample activated for 240 min. Thermal treatment increases the initial magnetization of all samples, with the most pronounced increase of ~95% in the sample activated for 300 min. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. OI 172057]

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Section: Resultsmentioning

confidence: 99%