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Keywords = (Sr1−xCax)5Ti4O13 ceramics

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12 pages, 4026 KiB  
Article
Crystal Structural Characteristics and Electrical Properties of (Ba0.7Sr0.3-xCax)(Ti0.9Zr0.1)O3 Ceramics Prepared Using the Citrate Gelation Method
by Jae-Young Jeong, Si-Hyun Kim, Ju-Hye Kim, Jae-Hoon Park, Da-Som Jung and Eung-Soo Kim
Materials 2023, 16(24), 7551; https://doi.org/10.3390/ma16247551 - 7 Dec 2023
Cited by 1 | Viewed by 1351
Abstract
The electrical properties of (Ba0.7Sr0.3-xCax)(Ti0.9Zr0.1)O3 (0 ≤ x ≤ 0.2) (BSCTZ) ceramics prepared using citrate gelation (CG) method were investigated by substituting Ca2+ ions for the Sr2+ sites based [...] Read more.
The electrical properties of (Ba0.7Sr0.3-xCax)(Ti0.9Zr0.1)O3 (0 ≤ x ≤ 0.2) (BSCTZ) ceramics prepared using citrate gelation (CG) method were investigated by substituting Ca2+ ions for the Sr2+ sites based on the structural characteristics of the ceramics. BSCTZ was sintered for 3 h at 1300 °C, lower than the temperature (1550 °C) at which the specimens prepared using the solid-state reaction (SSR) method were sintered, which lasted for 6 h. As the amount of substituted Ca2+ ions increased, the unit cell volume of the BSCTZ decreased because of the smaller ionic radius of the Ca2+ ions compared to the Sr2+ ions. The dielectric constant of BaTiO3-based ceramics is imparted by factors such as the tetragonality and B-site bond valence of the ceramics. Although the ceramic tetragonality increased with Ca2+ ion substitution, the x = 0.05 specimens exhibited the highest dielectric constant. The decrease in the dielectric constant of the sintered x > 0.05 specimens was attributed to the increase in the B-site bond valence of the ABO3 perovskite structure. Owing to the large number of grain boundaries, the breakdown voltage (6.6839 kV/mm) of the BSCTZ prepared using the CG method was significantly improved in relation to that (2.0043 kV/mm) of the specimen prepared using the SSR method. Full article
(This article belongs to the Special Issue Design and Processing of Piezoelectric/Ferroelectric Ceramics)
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12 pages, 4014 KiB  
Article
Enhancement of the Optical and Dielectric Properties at Low Frequency of (Sr1−xCax)5Ti4O13, (0 ≤ x ≤ 0.06) Structure Ceramics
by Sara J. Ahmed, Asad Ali, Abid Zaman, Aiyeshah Alhodaib, Abdulaziz H. Alghtani, Imen Bejaoui, Vineet Tirth, Ali Algahtani, Mohsin Khan, Abdullah and Mohammed Aljohani
Micromachines 2022, 13(11), 1824; https://doi.org/10.3390/mi13111824 - 26 Oct 2022
Cited by 2 | Viewed by 1916
Abstract
Low loss Ruddlesden–Popper (RP) series, i.e., (Sr1−xCax)5Ti4O13, 0.0 ≤ x ≤ 0.06, has been synthesized by a mixed oxide route. In this work, the substitution of Ca2+ cation in Sr5Ti [...] Read more.
Low loss Ruddlesden–Popper (RP) series, i.e., (Sr1−xCax)5Ti4O13, 0.0 ≤ x ≤ 0.06, has been synthesized by a mixed oxide route. In this work, the substitution of Ca2+ cation in Sr5Ti4O13 sintered ceramics was chosen to enhance the structural, optical, and dielectric properties of the product. It was found that the Ca2+ content has significant effects on enhancing the dielectric properties as compared to Mn and glass additions. It was observed that the relative density, band gap energy, and dielectric loss (tangent loss) increase while relative permittivity decreases along with Ca2+ content. High relative density (96.7%), low porosity, and high band gap energy (2.241 eV) values were obtained in (Sr1−xCax)5Ti4O13, 0.0 ≤ x ≤ 0.06 sintered ceramics. These results will play a key role in the application of dielectric resonators. Full article
(This article belongs to the Special Issue Microwave Passive Components)
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