Abstract
A complex structure of barium iron niobate, Ba(Fe0.5Nb0.5)O3 (BFN) and strontium titanate SrTiO3 (ST) was fabricated by a solid-state reaction method. The phase formation of Ba(Fe0.5Nb0.5)O3-SrTiO3 was checked using X-ray diffraction (XRD) technique. The X-ray structural analysis of BFN and BFN-ST ceramics, showed the formation of single-phase compound in the monoclinic system, which is a distorted structure of an ideal cubic perovskite. Careful examination of microstructures of the individual compounds of the system was done by the scanning electron micrograph (SEM), and confirms the polycrystalline nature of the systems. Detailed studies of dielectric and electrical impedance properties of the systems in a wide range of frequency (100Hz - 5MHz) and different temperatures (30°C-285°C) showed that these properties are strongly dependent on temperature and frequency.
Highlights
IntroductionOf B-site ions in the perovskite unit cell
Complex perovskite with general formula ABO3 (A = mono-divalent, B = trid to hexavalent) are widely used for detectors, sensors, actuators, multi-layer ceramic capacitor (MLCC), computer memories, pyroelectric detectors, wireless communication systems, microelectronics, global positioning systems and other electronic devices
The X-ray structural analysis of BFN and BFN-ST ceramics, showed the formation of single-phase compound in the monoclinic system, which is a distorted structure of an ideal cubic perovskite
Summary
Of B-site ions in the perovskite unit cell This may lead to composition fluctuations and, as a consequence, to different local Curie temperatures in the different regions of the ceramic [7]. Many researchers have studied BFN, including Saha and Sinha [8], Intatha et al [9], Fang et al [10], Raevski et al [11] Nedelcu et al [12], Tezuka et al [13], Yokosuka et al [14] and Rama et al [15] They have reported that the BFN-based electroceramics exhibit a relaxor behavior by showing very attractive dielectric and electric properties over a wide range of temperatures. The dielectric characteristics of BFN(a), BFN-ST5(b) and BFN-ST10(c) ceramics are evaluated in broad temperature and frequency ranges
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