Abstract The explosive process of 5G communication evokes the urgent demand miniaturized and integrated dielectric ceramics filter. It is a pressing need to advance development utilization emerging technology design new materials understand polarization mechanism. This review provides summary study microwave (MWDCs) sintered higher than 1000 from 2010 up now, °C with purpose taking broad historical view these illustrating research directions. To date, researchers endeavor explain...

In this study, tri-rutile type Mg_0.5Ti_0.5TaO₄ ceramics were synthesized, where the structure–property relationship, especially structural configuration and intrinsic dielectric origin of ceramics, low-firing characteristics studied. It is found that unambiguously identified through Rietveld refinement analysis, selected area electron diffraction (SAED), high-resolution transmission microscopy (HRTEM) along [110] zone axis. With increase in sintering...

Structure and microwave properties of xZn0.5Ti0.5NbO4-(1 - x)Zn0.15Nb0.3Ti0.55O2 ceramics in the range x = 0.0-1.0 were investigated. Rietveld refinement analysis Raman spectra show that rutile- orthorhombic-type solid solutions formed at 0-0.2 0.65-1, a composite 0.2-0.64. In solution regions, chemical bonds are enlarged. this case, Zn/Ti/Nb-O1 bond covalency susceptibility reduced, lattice energy thermal expansion coefficient increase along with increases, which is mainly responsible for...

A novel trirutile-type Co0.5Ti0.5TaO4 ceramic was reported here for the first time. The correlations between sintering behavior, crystal structure, chemical bond, and dielectric properties were investigated. Pure synthesized in temperature range of 1000-1100 °C. trirutile structure refined parameters a = b 4.71163 Å, c 9.13586 Vcell 202.811 Å3 could be obtained (1075 °C). According to P-V-L bond theory, majority contributions constant originated from Ta-O bonds, owing its largest ionicity...

Filled and unfilled Sr2NaNb5O15-based tungsten bronze ceramics based on Gd doping were prepared using a traditional solid-state reaction method. Relaxor behaviors of the two different systems analyzed, corresponding energy storage performance was also characterized. With support weakly coupled polar nanoregions non-polar matrix, an density 2.37 J/cm3 efficiency 94.4% obtained in Sr1.82Gd0.12NaNb5O15 ceramic. A discharge 2.51 power 59.1 MW/cm3 further proved its prospect for practical...

Abstract The ceramic capacitors with excellent energy storage properties and wide operating temperature are the main challenges in power system applications. Here, lead‐free (1‐x)Bi 0.5 Na TiO 3 ‐xCaTiO (abbreviated as BNT‐xCT) ceramics were synthesized through solid‐state reaction method. introduction of CT reduced permittivity peak BNT ceramic, guaranteeing thermal stability over a range −100 ∼ 136°C. Meanwhile, long‐range order structure was destructed by structural distortion, relaxor...

Recently, it was reported that the alkaline niobate‐based (K,Na,Li)(Nb,Ta,Sb)O 3 (LF4) perovskite ceramics showed excellent piezoelectric properties and have been regarded as a new candidate of lead‐free materials. However, effects additives on property LF4 not studied intensively so far. In this study, effect CuO addition to investigated. The sample tetragonal phase at room temperature also second with low melt point. With 0.05 wt% added, Cu 2+ firstly incorporated into A site, while higher...

Abstract In this study, intrinsic dielectric properties of ZnNb 2 O 6 ceramics were investigated using P–V–L chemical bond theory and far‐infrared reflectivity spectra. The largest ionicity susceptibility Nb–O bonds suggest that the polarizability is mainly determined by bonds. Relative permittivity, calculated via theory, close to experimental value TE 011 mode. are also crucial for structural stability. According spectra complex function analysis, a relatively consistent result between...

Hybrid electric cars and pulsed power technologies have increased the demand for capacitors with high energy density, wide temperature stability, operating voltage, good mechanical qualities. In this work, (1 - x) (0.6Bi0.5K0.5TiO3-0.4BiFeO3)-x(Na0.4Sm0.2NbO3) ((1 (BKTBF)-xNSN) relaxor ceramics were prepared by constructing morphotropic phase boundary (MPB) combined oxygen vacancy defect engineering. It is worth noting that 0.6BKT-0.4BFO at MPB a Pmax ∼ 60 μC/cm2. The ultra-hard (HV = 10.7...

A novel Na_1-<em>x</em>K<em>_x</em>TaO₃ (<em>x </em>= 0, 0.025, 0.05, 0.075, 0.1, and 0.15) ceramic with high permittivity positive temperature coefficient<strong> </strong>was synthesized via the conventional solid-state method. All samples were determined to be pure phase orthorhombic NaTaO₃ structure of space group Pmcn, larger grain lower porosity observed after adding an appropriate amount K⁺ ions. The <em>Q × f</em> value is majored...

(K,Na)NbO3–LiNbO3–CuO lead-free piezoelectric ceramics that show a high mechanical quality factor Qm were synthesized and used as drive element of an ultrasonic motor. The the (K,Na)NbO3 ceramic could be enhanced by chemical modification using Li Cu well microstructure control to obtain with fine grains. grain size dependence was consistent model based on formation internal bias field stabilize domain structure. A shear mode motor because d31 d33 constants not sufficient for applications....

Abstract Structure‐property relationships of Y 2 MgTiO 6 , a type double perovskite materials, were investigated systematically. Rietveld refinement XRD patterns confirmed that belongs to the P 1 /c space group and has structure analogous monoclinic Dy . In accordance with observed number vibrational bands theoretical predictions, O ions at 4e site dominated Raman peaks. The IR reflectivity spectrum indicated major contributions relative permittivity intrinsic loss modes lower than 500 cm −1...

The relationship between structure, bond characterizations and microwave dielectric properties of NdNb_1−x(Al_1/3W_2/3)_xO₄ (0.03 ≤ <italic>x</italic> 0.07) ceramics was characterized by complex chemical theory IR spectrum.

A series of lead- and bismuth-free tetragonal tungsten bronze ceramics with chemical formula given as Sr2–xMxNaNb5–xTixO15 (M = La3+ Ho3+) were prepared. Through codoping A- B-sites, switching from ferroelectric to relaxor at room temperature was achieved, different kinds ion doping showed degrees polarity loss behavior. The mechanism behavior investigated. exhibited by current systems does not seem satisfy the previous crystal chemistry framework structural modulation theory. results XRD...

Abstract Gd 2 Zr 3 (MoO 4 ) 9 is a double trigonal molybdate crystallized in the space group . The optimal microwave dielectric properties were achieved via solid‐state reaction at 725°C for ceramics: ε r = 11.17, Q × f 57 460 GHz, τ −31.91 ppm/°C. three‐dimensional framework type structure formed by mixed MoO4 tetrahedron and ZrO6/GdO9 polyhedron. analysis based on complex chemical bond theory shows that Mo–O bonds account majority contribution to controlling properties. ZrO6 octahedron...

Lead-free piezoelectric ceramics KNN modified by Li-substitution and CuO addition have been synthesized, the dielectric properties were measured. A morphotropic phase boundary (MPB) between orthorhombic tetragonal phases was formed with Li-substitution. The co-doping of Li Cu markedly enhanced mechanical quality factor (Q <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</sub> ) in comparison sole doping Cu. Anomalous anti-ferroelectric-like...