The ability to form oxide nanorods is of great interest in a number areas. In this paper, we report the template-based growth several ceramics, formed by means combination sol–gel processing and electrophoretic deposition. Both single metal oxides (TiO2, SiO2) complex (BaTiO3, Sr2Nb2O7, Pb(Zr0.52Ti0.48)O3) have been grown method. Uniformly sized about 125–200 nm diameter 10 μm length were over large areas with near unidirectional alignment. Desired stoichiometric chemical composition crystal...

Nanorods of lead zirconate titanate (PZT)—a ferro- and piezoelectric material—up to 10 μm in length 70 150 nm diameter are produced by sol-gel electrophoresis PZT a track-etched polycarbonate membrane, which is used as template. The Figure gives close-up view film with nanowires attached, obtained after pyrolytic removal the organic

This article reports a systematic study of doping effects on the crystal structure, microstructure, dielectric, and electrical properties layer-structured strontium bismuth niobate, SrBi2Nb2O9 (SBN), ferroelectrics. Substitution in both A site (Sr2+ by Ca2+ Ba2+) B (Nb5+ V5+) up to 30 at % were studied. It was found that lattice constant, SBN ferroelectrics varied appreciably with type amount dopants. The relationships among ionic radii, structural constraint imposed [Bi2O2]2+ interlayers, discussed.

In this letter, we report an experimental study on the influences of 10 at. % Ca2+ and La3+ doping dielectric properties dc conductivity SrBi2Nb2O9 ferroelectric ceramics. All samples were made by two-step solid-state reaction sintering at temperatures up to 1150 °C for 0.5–1 h in air. X-ray diffraction analysis indicated that single-phase layered perovskite ferroelectrics obtained no appreciable secondary phase was found. The Curie point found increase from 418 without 475 with 480 doping....

Structure refinement for Aurivillius ferroelectric Na_0.5Nd_0.5Bi₄Ti₄O₁₅and evolutions in<italic>T</italic>_c,<italic>P</italic>_rand<italic>E</italic>_cwith the increasing<italic>x</italic>value in Na_0.5Nd_xBi_4.5−xTi₄O₁₅.

This letter reports on enhanced ferroelectric properties and lowered processing temperatures of a SrBi2(V, Nb)2O9 system with vanadium doping. The samples were prepared by reaction sintering powder mixtures constituent oxides. With partial substitution niobium cations (up to 10 at. %), the single-phase layered perovskite structure was preserved temperature significantly (∼ 200 °C). incorporation into resulted in shift Curie point higher temperatures, from 435 457 °C % doping, an increase...

The strontium bismuth tantalate vanadate, SrBi2Ta1.8V0.2O9, (SBTV) layered perovskite ferroelectrics were made by solid state powder sintering. It was found that the SBTV had same crystal structure as of tantalate, SrBi2Ta2O9 (SBT), but an increased paraferroelectric transition temperature at ∼360 °C compared to 305 for SBT. In addition, showed a frequency dispersion low frequencies and broadened dielectric peaks shifted higher with reduced frequency. However, after postsintering annealing...

Mesoporous silica films with low dielectric constants and possibly closed pores have been achieved a multiple step sol-gel processing technique. Crack-free approximately 50 % porosity 0.9 μm thicknesses were obtained, tape-test revealing good adhesion between substrates or metal electrodes. Dielectric remained virtually unchanged after aging at room temperature 56 humidity over 6 days.

Rapid, nondestructive and accurate detection of internal qualities the apple is an important research interest. In this study, brix, acidity brix/acidity ratio were rapidly detected by visible near-infrared spectroscopy (VIS-NIRS). By scanning spectra measuring reference values brix samples, relationship models between acidity, were, respectively, established. Sample division, characteristic wavelength optimization, modeling methods compared systematically, optimal prediction model each...

Copper complexes have attracted significant interest for catalyzing oxidative dehydrogenative carboxylation of alkanes to form esters. Here, we report a heterogeneous catalyst, in which copper are immobilized on coal-bearing kaolin the synthesis allylic esters via C(sp3)-H bond activation through cross-dehydrogenation coupling reactions between cyclic and aromatic carboxylic acids. Systematic optimization reaction conditions—including catalyst loading, content, oxidant, temperature,...

The processing conditions, microstructure, and dielectric properties of strontium bismuth niobate vanadate ceramics, SrBi 2 (V x Nb 1− ) O 9 (SBVN, with 0 ≤ 0.3), were systematically studied. A relative density &gt;90% was obtained for all the samples using a two‐step sintering process. XRD showed that single phase layered perovskite structure (SBN) formed vanadium content up to 30 at.%. SEM revealed average grain size decreased gradually an increase in content. Curie point found from ∼418°C...

Na0.5Bi2.5Ta2O9-based piezoelectric ceramics, Na0.5-xBi0.5-xLixCexBi2Ta2-xScxO9-x (NBTO-x, x = 0–0.05), were synthesized by using a solid-state reaction process, and their electro-mechanical properties electrical conduction behaviors investigated in detail. The Li+/Ce3+/Sc3+ modification improved the of ceramics effectively, whereas further N2 or O2 annealing led to no obvious increase coefficient (d33). composition 0.03 ceramic with high temperature stability had Curie point (Tc) 784 °C d33...

Iron is the most abundant transition metal on Earth. In this study, we have demonstrated an iron nanoparticle–loaded kaolin-catalyzed cross dehydrogenative coupling (CDC) reaction via C(sp3)–H activation. We use CDC of carboxylic acids with cyclohexenes to discuss various parameters such as amount catalyst, oxidant, temperature, and time. Under optimized condition, corresponding allylic ester was obtained good yield (85%). Screening substituted benzoic cyclic acyclic olefins shows broad...

This paper presents a semiconductor varactor tuned four-pole bandpass filter. The filter was designed to have constant fractional bandwidth of 3% and with single control voltage. design methods how keep coupling coefficients make all the resonators synchronously are described in details. built on two-inch double-side high temperature superconducting film. center frequency can be from 430 720 MHz direct voltage up 20 V. return loss is better than 10 dB whole tuning range. Insertion range 0.8...

The effects of biological variations on platelet counts were investigated in 694 healthy subjects aged 18 to 60 years living three cities including Chengdu (Sichuan Province), Suzhou (Jiangsu Province) and Harbin (Heilongjang China. Platelet significantly lower (52-202 x 10(9)/L) (60-259 than (154-348 (p <0.0001), but the mean volume (MPV) determined concurrently was negatively correlated with count, MPV values higher (11.8-15.6 fl) (10.9-15.8 (9.5 approximately 12.9 < 0.0001). summer...

This letter presents a dual-band lowpass–bandpass filter utilizing dual-mode unit cells. The first mode can be tuned without affecting the second mode. I/O coupled lines for bandpass response introduce transmission zero (TZ) to improve selectivity of lowpass response. Indeed, developed improved cell provides frequency ratio ranging from 1 4 and fractional bandwidth up 60%. Additionally, seven-section is designed fabricated, affording flexible passband allocation, where response's cutoff...