A5058488035- Ferroelectric and Piezoelectric Materials
- Microwave Dielectric Ceramics Synthesis
- Multiferroics and related materials
- Advanced ceramic materials synthesis
- Dielectric materials and actuators
- Nuclear materials and radiation effects
- Dielectric properties of ceramics
- Acoustic Wave Resonator Technologies
- Advanced Sensor and Energy Harvesting Materials
- Supercapacitor Materials and Fabrication
- Microwave-Assisted Synthesis and Applications
- MXene and MAX Phase Materials
- Luminescence Properties of Advanced Materials
- Electromagnetic wave absorption materials
- High voltage insulation and dielectric phenomena
- Electrical and Thermal Properties of Materials
- Layered Double Hydroxides Synthesis and Applications
- Crystallography and molecular interactions
- Full-Duplex Wireless Communications
- Crystal structures of chemical compounds
- Inorganic Chemistry and Materials
- Advancements in Battery Materials
- Zeolite Catalysis and Synthesis
- Sphingolipid Metabolism and Signaling
- Electrocatalysts for Energy Conversion
Xi'an Technological University
2016-2025
China XD Group (China)
2014-2020
University of Sheffield
2016-2019
Xi'an Jiaotong University
2007-2014
Novel BaTiO<sub>3</sub>-based capacitors show promising energy storage performance with high breakdown strength and discharge density outstanding efficiency.
Bi<sub>2</sub>(Li<sub>0.5</sub>Ta<sub>1.5</sub>)O<sub>7</sub> ceramics possess a <italic>ε</italic><sub>r</sub> of 65.1, <italic>Q</italic><sub>f</sub> 15 500 GHz and TCF −17.5 ppm °C<sup>−1</sup>. The sintering temperature was lowered to 920 °C by the addition 2 mol% Bi<sub>2</sub>O<sub>3</sub>, which makes them potential candidates for dielectric resonators LTCC applications.
In this work, Mn-doped 0.9BaTiO3-0.1Bi(Mg2/3Nb1/3)O3 ceramics were prepared by the conventional solid state reaction method, and effect of defect dipoles on energy storage properties lead free relaxor ferroelectric BaTiO3-based was studied. The crystal structure, dielectric properties, explored in detail. It found that polarization hysteresis (P-E) loops 0.9BaTiO3-0.1Bi(Mg2/3Nb1/3)O3-x wt. % MnCO3 (0.2–0.5) took high maximum (Pmax) low remanent (Pr). Meanwhile, recoverable density (Wrec)...
Temperature stable microwave dielectric ceramics were obtained for compositions with 0.45BiVO<sub>4</sub>–0.55TiO<sub>2</sub>sintered at 900 °C with<italic>ε</italic><sub>r</sub>∼ 86, a<italic>Q</italic><sub>f</sub>∼ 9500 GHz and TCF ∼ −8 ppm per °C. It is promising both low temperature co-fired ceramic technology dielectrically loaded micro-strip patch antennas substrates.
Microwave dielectric ceramics are vital for filters, resonators, and antennas in the 5G era. It was found that (Cu1/3Nb2/3)4+ substitution can effectively adjust TCF (temperature coefficient of resonant frequency) Li2TiO3 simultaneously increase its Q × f (Q denote quality factor frequency, respectively) value. Notably, excellent microwave properties (εr (permittivity) ≈ 18.3, 77,840 GHz, +9.8 ppm/°C) were achieved Li2Ti0.8(Cu1/3Nb2/3)0.2O3 (LTCN0.2) ceramic sintered at 1140 °C....
The LTMN<sub>0.25</sub> + 1 wt% 0.6CuO–0.4B<sub>2</sub>O<sub>3</sub> ceramic with low sintering temperature, small density and excellent performance have wide application prospects in 5G devices.
Abstract High‐temperature performance is critical to the dielectric polymer capacitors used in environment electronic and high‐power applications. Here, authors report a composite comprising polyimide (PI) polymers blended with high‐insulation magnesium oxide (MgO) nano‐filler that exhibits high breakdown strength, wide temperature range, low loss. However, most possess excellent energy storage properties at room cannot be temperatures above 100 °C. Polyimide nanocomposites prepared by situ...
Na 2 O–Bi O 3 –MoO ternary microwave dielectric ceramics with high-performance properties have good potential in the application of LTCC/ULTCC technology.
The sandwich-structured KNN-BZT/P(VDF-HFP) nanocomposites were prepared by solution casting method. When the breakdown strength reached 565 MV m −1 , excellent energy storage performance ( U d = 21.39 J cm −3 η 70.54%) was obtained.
Multilayer ceramic capacitor as a vital core-component for various applications is always in the spotlight. Next-generation electrical and electronic systems elaborate further requirements of multilayer capacitors terms higher energy storage capabilities, better stabilities, environmental-friendly lead-free, etc., where these major obstacles may restrict each other. An effective strategy performance global optimization put up here by constructing local polymorphic polarization configuration...
A series of compounds in the Li 2 O–Bi O 3 –MoO ternary system were investigated with regard to preparation, phase composition, microwave dielectric properties, and chemical compatibility silver (Ag) aluminum (Al) electrodes. All ceramics this work have sintering temperatures lower than 750°C. The behaviors properties three single phases MoO 4 , (Li 0.5 Bi )MoO 8 Mo 7 28 bulk ceramics, particular focus investigation. ceramic can be sintered a high density at 540°C/2 h relative permittivity...
A new ultra‐low‐temperature firing microwave dielectric ceramic, Li 2 WO 4 with the phenacite structure, was prepared via solid‐state reaction method. The ceramic can be well sintered at 640°–660°C, a relative permittivity ∼5.5, Q × f value about 62 000 GHz, and negative temperature coefficient of −146 ppm/°C 15.7 GHz. From an X‐ray diffraction analysis, found to chemically compatible both silver aluminum powders 640°C. All results indicate that is promising candidate for ultra‐low cofired...
In the present work, (Bi1-xCex)VO4 (x ≤ 0.6) ceramics were prepared via a solid-state reaction method and all ceramic samples could be densified below 900 °C. From X-ray diffraction analysis, it is found that monoclinic scheelite solid solution can formed in range x 0.10. 0.20 0.60, composite region with both tetragonal zircon solutions was content of phase increased calcined or sintering temperature. The refined lattice parameters (Bi0.9Ce0.1)VO4 are = 5.1801(0) Å, b 5.0992(1) c 11.6997(8)...
Preparation, phase composition, microwave dielectric properties, and chemical compatibility with silver aluminum electrodes were investigated on a series of single‐phase compounds in the Bi 2 O 3 –MoO binary system. All materials have ultralow sintering temperatures <820°C. Eight different x –(1− )MoO between 0.2≤ ≤0.875 fabricated associated properties studied. The β‐Bi Mo 9 single has positive temperature coefficient resonant frequency (TCF) about +31 ppm/°C, permittivity ɛ r =38 Q f...
Dense Li6B4O9 microwave dielectric ceramics were synthesized at low temperature via solid-state reaction using Li2CO3 and LiBO2. Optimum permittivity ∼ 5.95, quality factor 41 800 GHz coefficient of resonant frequency – 72 ppm/°C obtained in sintered 640 °C with a ultrasmall bulk density ∼2.003 g/cm3 (∼95% relative density, the smallest among all reported ceramics). shown to be chemically compatible silver electrodes but reacted aluminum forming Li3AlB2O6 Li2AlBO4 secondary phases. A...
BaTiO3-based materials show great promise for energy storage capacitors, but their low breakdown strength and high remnant polarization currently result in relatively density. Here, we report a novel (1–x)BaTiO3–xBi(Li0.5Ta0.5)O3 (0.06 ≤ x 0.12, BT–xBLT) lead-free ceramic with electric field (E) ∼ 280 kV cm–1, discharge density (We) 2.2 J cm–3, charge–discharge efficiency (η) > 89% that is thermally stable up to 160 °C fast time (≤0.5 μs). Multilayers of compositions = 0.1 also exhibited We...
Abstract In the (Bi 1 − x Ce )VO 4 (0 ≤ 1) system, we found that 0.1) belongs to monoclinic scheelite phase and (0.7 tetragonal zircon phase, while (0.1 < 0.7) mixed phases of both structure. Interestingly, two components with near‐zero temperature coefficient resonant frequency (TCF) appeared in this system. our previous work, a TCF ~+15 ppm/°C was obtained 0.75 0.25 ceramic permittivity (ε r ) ~47.9 Qf (Q = quality factor 1/dielectric loss; f frequency) value ~18 000 GHz (at 7.6 GHz)....
A permittivity of ∼76.3 ± 0.5 and a quality factor >10 000 GHz were obtained in 0.94BiVO<sub>4</sub>–0.06LaNbO<sub>4</sub> ceramic sintered at 800 °C.
With the ultrahigh power density and fast charge–discharge capability, a dielectric capacitor is an important way to meet increase in demand for energy storage system such as pulsed systems (PPS). The BaTiO3-based considered one of candidates PPS due its high permittivity. However, with continuous miniaturization PPS, further increases thermal stability capacitors. Thus, this work describes new performance multilayer ceramic (MLCC) BaTiO3–xBi(Li0.5Nb0.5)O3 (BT–xBLN) (0.0 ≤ x 1.0) PPS. On...
Abstract In the present work, Bi 3+ was used to substitute for Nd in NdNbO 4 ceramic and pure fergusonite solid solution formed within 20 mol. % substitutions. Microwave dielectric permittivity of (Nd 1‐ x B i )NbO (x ≤ 0.2) ceramics increased linearly with value due larger ionic polarizability than . Excellent microwave properties a ( ε r ) ~22.5, Qf (Q = quality factor, f resonant frequency) ~50 000 GH z, TCF ~−9 ppm/°C were obtained 0.9 0.1 ceramic. This method might work other...