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2024
Volume: 14 Issue 6
11 Article(s)
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Research Articles
Progress in sintering technology of transparent polycrystalline alumina ceramics
Jun Yin, Xiao Li, Xi Zhang, Shengquan Yu, and Yuanming Lai
As an important optical material,transparent polycrystalline alumina (PCA) ceramic is widely used in aerospace,high-temperature windows,medical due to its high strength,corrosion resistance,high hardness,and excellent stability at high temperatures. Since Al2O3 belongs to the crystal structure of the trigonal crystal sAs an important optical material,transparent polycrystalline alumina (PCA) ceramic is widely used in aerospace,high-temperature windows,medical due to its high strength,corrosion resistance,high hardness,and excellent stability at high temperatures. Since Al2O3 belongs to the crystal structure of the trigonal crystal system (
Journal of Advanced Dielectrics
- Publication Date: Jan. 14, 2025
- Vol. 14, Issue 6, 2330002 (2024)
Is it possible to speak about the two-dimensional nature of the dielectric properties of layered perovskite-like compounds of the family of Aurivillius–Smolensky phases?
Ivan A. Parinov, and Sergei V. Zubkov
Two-dimensionality of the properties of a volumetric object may be defined by its anisotropy. Perovskite-like compounds of the family of Aurivillius–Smolensky phases (ASPs) have exactly this property. By studying perovskite-like compounds of the family of Aurivillius–Smolensky phases and the changes in the volume of thTwo-dimensionality of the properties of a volumetric object may be defined by its anisotropy. Perovskite-like compounds of the family of Aurivillius–Smolensky phases (ASPs) have exactly this property. By studying perovskite-like compounds of the family of Aurivillius–Smolensky phases and the changes in the volume of the crystal lattice,occurring in them,namely the increase or decrease in the phase transition temperature (Curie temperature),the preferred direction of grain growth with an increase in the sintering temperature and,as a consequence,the increase in the relative permittivity,the main factor in all cases is the change in the linear parameters a and b,lying in the plane perpendicular to the c-axis..
Journal of Advanced Dielectrics
- Publication Date: Jan. 14, 2025
- Vol. 14, Issue 6, 2340007 (2024)
Optimizing deposition regimes to fabricate VO2/TiO2/c-Al2O3 thin films for active metasurfaces
M. E. Kutepov, V. E. Kaydashev, D. V. Stryukov, A. S. Konstantinov, A. S. Mikheykin, A. V. Nikolskiy, A. T. Kozakov, A. D. Morozov, M. A. Kashchenko, G. V. Alymov, and E. M. Kaidashev
Decreasing the scale of vanadium dioxide (VO2) structures is one of the ways to enhance the switching speed of the material. We study the properties of VO2 films of altered thicknesses in the range of 20–170nm prepared on c-sapphire substrates with a TiO2 sublayer by pulsed laser deposition (PLD) method. The synthesis Decreasing the scale of vanadium dioxide (VO2) structures is one of the ways to enhance the switching speed of the material. We study the properties of VO2 films of altered thicknesses in the range of 20–170
Journal of Advanced Dielectrics
- Publication Date: Jan. 14, 2025
- Vol. 14, Issue 6, 2340011 (2024)
Microstructure of Nd:YAG transparent dielectric ceramics with ultra-high-quality factor
Xiao Li, Jun Yin, Shengquan Yu, Xi Zhang, and Yuanming Lai
In this work,solid-state reaction method and a two-step sintering procedure were successfully used to prepare neodymium-doped yttrium aluminum garnet (Nd:YAG) transparent dielectric ceramics. The effects of the microstructure and crystal structure of the ceramics on the microwave dielectric properties were investigatedIn this work,solid-state reaction method and a two-step sintering procedure were successfully used to prepare neodymium-doped yttrium aluminum garnet (Nd:YAG) transparent dielectric ceramics. The effects of the microstructure and crystal structure of the ceramics on the microwave dielectric properties were investigated. Samples after vacuum sintered at 1600–1750∘C and further hot isostatic pressing (HIP) at 1700∘C had a pure YAG phase. The cell volume increased slightly after further HIP treatment compared to the vacuum-sintered ceramics. Combined with the disordered arrangement of the atoms in the HRTEM image,the lattice expansion could be explained by the entrance of larger ions into the YAG lattice. Moreover,the sintering drive provided by HIP could effectively eliminate the porosity in ceramics,increase the average grain size,and narrow the grain boundaries,which was conducive to the improvement of transmittance and quality factor (Qf) value. Finally,the sample that was vacuum sintered at 1700∘C and then exposed to HIP had outstanding microwave dielectric characteristics:
Journal of Advanced Dielectrics
- Publication Date: Jan. 14, 2025
- Vol. 14, Issue 6, 2440001 (2024)
Structural and microwave dielectric properties of LiZnSbO4 ceramcis for dielectric resonator antenna applications
Guoguang Yao, Ya Lu, Xu Gao, Cuijin Pei, Weihong Liu, Jin Liu, and Peng Liu
New microwave dielectric ceramics of LiZnSbO4 were prepared by the reactive sintering method. Within the sintering temperature zone of 1350∘C–1385∘C,a single-phase LiZnSbO4 with an orthorhombic structure was identified by XRD refinement,which contains 10 molecular formula per unit cell (i.e.,Z=10). The relative densityNew microwave dielectric ceramics of LiZnSbO4 were prepared by the reactive sintering method. Within the sintering temperature zone of 1350∘C–1385∘C,a single-phase LiZnSbO4 with an orthorhombic structure was identified by XRD refinement,which contains 10 molecular formula per unit cell (i.e.,
Journal of Advanced Dielectrics
- Publication Date: Jan. 14, 2025
- Vol. 14, Issue 6, 2440003 (2024)
Influence of
Junbo Guo, Xiangpeng Wang, Yang Song, Leijun Yao, Chuanshi Min, Xiao Li, Fanshuo Wang, and Yuanming Lai
The Mg2Al4Si5−xSnxO18 (0≤x≤0.20) ceramics were successfully synthesized via the solid-state reaction method. The XRD results show that the main phase of the ceramics is Mg2Al4Si5O18. When x=0,there is a second phase of Al2SiO5. With the increase of x,the content of Sn2+ gradually increased,the Al2SiO5 phase disappearedThe Mg2Al4
Journal of Advanced Dielectrics
- Publication Date: Jan. 14, 2025
- Vol. 14, Issue 6, 2440013 (2024)
Novel high-performance 2–1–2 composites with two ferroelectric components causing a variable anisotropy of figures of merit
Vitaly Yu. Topolov, and Sofya A. Kovrigina
A high performance of novel three-component composites with 2–1–2 connectivity is reported and discussed. Layers of the composites are parallel-connected,and each layer contains the ferroelectric (FE) component. The layer of the first type (LFT) represents domain-engineered single crystal poled along either [0 0 1] or A high performance of novel three-component composites with 2–1–2 connectivity is reported and discussed. Layers of the composites are parallel-connected,and each layer contains the ferroelectric (FE) component. The layer of the first type (LFT) represents domain-engineered single crystal poled along either [0 0 1] or [0 1 1]. The layer of the second type is described as a system of long FE ceramic rods that have the shape of an elliptic cylinder and are aligned in a polymer medium. Piezoelectric coefficients
Journal of Advanced Dielectrics
- Publication Date: Jan. 14, 2025
- Vol. 14, Issue 6, 2450001 (2024)
Synthesis,X-ray diffraction and dielectric studies of the ceramic samples (
D. Yu. Fedulov, K. E. Kamentsev, A. A. Bush, and V. I. Kozlov
Ceramic samples of the (1−x)BaTiO3⋅xPbFe2/3W1/3O3,0≤x≤1 ((1−x)BT⋅xPFW) system were synthesized by solid-state reactions method. The samples were characterized by X-ray diffraction (XRD) and dielectric studies,as well as by the measurements of the thermally stimulated depolarization currents (TSDC). It was found that thCeramic samples of the (
Journal of Advanced Dielectrics
- Publication Date: Jan. 14, 2025
- Vol. 14, Issue 6, 2450002 (2024)
Microwave absorption properties of bismuth ferrite-based ceramics
P. A. Astafev, D. I. Zorin, J. A. Reizenkind, A. M. Lerer, K. P. Andryushin, A. A. Pavelko, and L. A. Reznichenko
The paper presents the results of a study of the microwave absorption properties of ceramic materials based on bismuth ferrite containing rare earth elements,as well as systems of solid solutions (1−x)BiFeO3–xPbFe1/2Nb1/2O3 in a wide range of component concentrations. The methodology for measuring and calculating the pThe paper presents the results of a study of the microwave absorption properties of ceramic materials based on bismuth ferrite containing rare earth elements,as well as systems of solid solutions (
Journal of Advanced Dielectrics
- Publication Date: Jan. 14, 2025
- Vol. 14, Issue 6, 2450003 (2024)
Atomic resolution microstructure study of Bi-doped SrTiO3
Chao Li, Yijun Zhang, Guohua Dong, Guangliang Hu, Guang Yang, Chaoqiang Liu, Houwen Chen, and Xiaoyong Wei
Intrinsic SrTiO3 is a quantum paraelectric,but moderately Bi-doped SrTiO3 exhibits dielectric frequency dispersion similar to relaxor ferroelectrics. In this paper,detailed electron microscopic studies of the microstructures of Bi-doped SrTiO3 samples were presented. It was found that the Sr sites were replaced by off-Intrinsic SrTiO3 is a quantum paraelectric,but moderately Bi-doped SrTiO3 exhibits dielectric frequency dispersion similar to relaxor ferroelectrics. In this paper,detailed electron microscopic studies of the microstructures of Bi-doped SrTiO3 samples were presented. It was found that the Sr sites were replaced by off-central Bi,resulting in tensile strain in the strontium titanate (STO) lattice. In the Bi-doped SrTiO3 samples,the valence of titanium mainly showed the Ti
Journal of Advanced Dielectrics
- Publication Date: Jan. 14, 2025
- Vol. 14, Issue 6, 2450004 (2024)
Author Index (Volume 14)
Journal of Advanced Dielectrics
- Publication Date: Jan. 14, 2025
- Vol. 14, Issue 6, 2499001 (2024)
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