The findings in this study could broaden the applications of KNN materials a new field.

Pb(Zn 1/3 Nb 2/3 ) 0.20 (Zr 0.50 Ti 0.80 O 3 ceramics of pure perovskite structure were prepared by the two‐stage method with addition 0–3.0 wt% MnO 2 and their piezoelectric properties investigated systematically. The influences in a pronounced way both crystal microstructure materials. materials are transformed from tetragonal to rhombohedral structure, grain size is enhanced when manganese cations added. distortion for samples can be explained Jahn–Teller effect. values electromechanical...

Ceramic capacitors with upper operating temperatures far beyond 200°C are essential for high-temperature electronics used in deep oil drilling, aviation, automotive industry and so on. Recent advances existing lead-free dielectrics potential capacitor applications reviewed grouped into three categories according to the parent component of solid solution. Their desirable temperature stabilities were summarised comprehensively. However, there still some limitations current research, such as...

Microstructure and electrical properties of manganese oxide (MnO)‐doped (Na 0.5 Bi ) 0.92 Ba 0.08 TiO 3 (NBBT) piezoceramics were investigated in this work. X‐ray diffraction analysis shows that the suitable substitution Mn ion into B site induces lattice distortion perovskite NBBT: solution limit is at 0.3 wt% MnO. Besides, it observed sintering can be improved by adding a small amount MnO, thus increasing grain size relative density. Further, temperature dependence dielectric permittivity...

Low-temperature sintering of 0.5Pb(Zn1∕3Nb2∕3)O3–0.5Pb(Zr0.47Ti0.53)O3 ceramics (0.5PZN–0.5PZT) was investigated using Li2CO3 as aids. The addition significantly improved the sinterability 0.5PZN–0.5PZT ceramics, resulting in a reduction temperature from 1100to950°C. Moreover, effect on dielectric and piezoelectric responses systems systematically studied this work. analysis x-ray diffraction patterns scanning electron microscopy indicated that solubility limit Li ions perovskite structures...

The multisite occupation of Li+ cations in perovskite structure (Bi1/2Na1/2)TiO3-based solid solution is investigated, which rarely reported previous studies. relation to the Li2CO3 doping level has been demonstrated with aid microstructure and temperature-dependent conductivity analysis: As addition below 0.75 mol. %, introduced precede enter A sites lattice compensate for A-site deficiency stemming from high-temperature sintering process. Once exceeds excess will occupy B substitute Ti4+...

In this work, we suggested a method to evaluate quantitatively the effect of doping oxide on phase coexistence PbZr 1− x Ti O 3 (PZT)‐based ceramics through analysis Raman scattering spectra. Theoretically, degenerated T 3u mode in cubic PZT will transform as A 1 (3) and E (4) modes tetragonal or rhombohedral ( R ) below Curie temperature, which set up theoretical base study ferroelectric materials. Through separation by fitting bands, shifts intensities different vibration were determined....

In this paper, (Bi0.5Na0.5)0.94Ba0.06Ti1-xZnxO3 ceramics (0 ≤ x 0.06) were prepared by the solid oxide reaction route. The doping of Zn2+ into Bi0.5Na0.5TiO3-6BaTiO3 delays crossover from nonergodic to ergodic states, and thermal depolarization temperature Td is delayed 85 °C for pure samples 120 doped 6% Zn2+, as confirmed temperature-dependent dielectric ferroelectric measurements. It suggests that variation could be ascribed reformation long-range order due large ionic polarizability...

In this paper, Co 2 O 3 ‐added‐85(Bi 1/2 Na )TiO –12(Bi K –3BaTiO (BNKB) lead‐free piezoceramics were fabricated by the conventional solid oxide routine. By use of X‐ray photonic spectra, diffraction, and scanning electronic microscope, valence state cations, lattice distortion, microstructures investigated. It is revealed that addition affects concentration 3+ cations changes tetragonality c / a perovskite lattice. The variation in microstructure, combined with acceptor doping behavior ,...

Perovskite type (Ba0.9Bi0.1)(Ti0.9Al0.1)O3 (BBTA) ceramics have been prepared through solid state reaction route. The room temperature x-ray diffraction study suggests that BBTA single phase tetragonal symmetry with space group P4mm. In contrast to the sharp dielectric transition of pure BaTiO3, a broad anomaly coupled shift in maxima toward higher increasing frequency has observed BBTA. quantitative characterization based on empirical parameters (ΔTm, γ, ΔTrelax, and ΔTdiffuse(1 kHz))...

For NaNbO3, its intrinsic phase transition sequence is still controversial in literature. In this paper, high-densified NaNbO3 ceramics derived from mechanochemical nanostructures presented a stabilized antiferroelectric characteristic. addition to the Tc of 360 °C, another diffuse dielectric anomaly appeared around 100 which did not vanish after O2 annealing treatment. The fine structure analysis indicated that belongs first order P Q phase. Moreover, even exerting strong electric field...

Single-crystalline K0.5Bi0.5TiO3 nanowires have been fabricated by a large scale and facile molten salt synthetic method in KCl medium. Pristine diameters of about 40nm lengths exceeding 4μm, they possess tetragonal perovskite structure. The ceramics with relative density above 98% can be from high quality nanowires. A broad dielectric peak frequency dependent maximum temperature was observed, which well fitted modified Curie-Weiss law Vogel-Fulcher relationship. suggested relaxor behavior...

Nanostructures of crystalline orthorhombic sodium niobate ( NaNbO 3 ) were synthesized by a molten salt synthesis procedure. As comparison, an auxiliary experiment via conventional solid state reaction process was carried out simultaneously. The microstructure and morphology evolution the nano particles investigated in detail, on basis experimental results, situ transformation mechanism has been proposed to elucidate formation processes microstructures. It found that both initial shape Nb 2...

NaNbO3 sits at an instability between its ferroelectric and antiferroelectric phases, but nanoscale polarization behavior is rarely reported. In this work, we produced high-density nanostructured ceramics with a grain size of 50 nm by spark plasma sintering nanocrystalline powder, which was obtained mechanosynthesis. The exhibited symmetrical loop increased relative permittivity. We believe that the internal stress stabilized domain structure, promoted macroscopic piezoelectricity,...

Thermal depoling phenomena determine the upper temperature limit of piezoelectric ceramics in application. In this paper, high-densified KNbO3 derived from single-crystalline nanostructures exhibited favorable constants d33, which varied 105 to 80 pC/N over a broad range 25 225 °C. situ x-ray diffraction combined with Raman spectra demonstrate clearly transition sequence crystallographic orientations during thermal process. The interaction between defect dipoles D and spontaneous...

Lead‐free binary K 1/2 Bi TiO 3 ‐ ( Mg Ti ) O KBT BMT ferroelectric ceramics with a morphology of dense and evenly sized grains have been prepared by conventional solid oxide reaction route. X‐ray diffraction analysis indicates that all the samples possess pure perovskite structure, undergo phase transformation from tetragonal to pseudocubic as adds into . Meanwhile, addition brings in enhancement relaxor behavior revealed temperature‐dependent dielectric profiles P–E loops. The impedance...