Particulate composites of ferrite and ferroelectric phases with xNiFe2O4 (NF) (1 − x)Pb0.988(Zr0.52Ti0.48)0.976Nb0.024O3 (where x = 2, 10, 20, 30, 50, 70, 100 wt. %) were prepared in situ by sol-gel method. The presence a diphase composition was confirmed X-ray diffraction while the microstructure studied scanning electron microscopy revealing good mixing two densification bulk ceramics. dielectric permittivity shows usual dispersion behavior increasing frequency due to Maxwell-Wagner...

Abstract Two environmentally friendly organics (ethylenediaminetetraacetic acid, EDTA and its easier biodegradabe isomer, ethylenediamine-N, N′-disuccinic EDDS) were used to dope calcium carbonate (CC) nanoparticles intending increase their adsorptive properties evaluate adsorption performance (uptake capacity removal efficiency) for the persistent Reactive Yellow 84 azo dye. Easily synthesized nanomaterials fully characterized (morphology size, mineralogy, organic content, surface area,...

The actual techniques allowing the fabrication of waveguides in lithium niobate are not able to satisfy one demands modern integrated photonics namely well-controlled tunability index contrast over a large range values (from high-index low contrast). This paper presents simple and reliable method between (Δne = 0.1) low-index 0.035) while benefiting from optical nonlinearity LiNbO3 fabricated using HiVac-VPE technique. study involves both planar channel waveguides. subjected an annealing...

The electric field dependence of the dielectric constant (dc-tunability) as a function temperature for few compositions Ba(Sn,Ti)O3 ceramics was investigated. Dense and homogeneous BaSnxTi1−xO3 (ferroelectric x = 0.05 0.10, relaxor 0.15 0.20) with high low losses were prepared by solid state reaction. Their dc-tunability characteristics investigated at temperatures from 20–120 °C, including Curie range. tunability data discussed in terms Johnson model completed Langevin term that describes...

Tunable microwave devices are widely used in radar, telecommunication and radio frequency measurement systems. In recent years, a promising technology for tunable devices, which combines the advantages of using magnetic electrical properties materials as well their magnetoelectric coupling, has been developed. present work, xMnFe2O4-(1 − x)Pb0.988(Zr0.52Ti0.48)0.976Nb0.024O3 ferrite-ferroelectric composites have prepared functional were investigated, order to be designed components devices....

High-index contrast lithium niobate waveguides, fabricated by the High Vacuum Vapor-phase Proton Exchange (HiVac-VPE) technique, are very promising for increasing both optical nonlinear and electro-optical efficiencies of photonic integrated devices. So as to play this role effectively, it is mandatory know crystallographic phase composition waveguides position protonated layers appropriate tailoring optimization based on intended applications. In addition, estimation structural disorder...

We present the results of an experimental study waveguide tapers realized in LiNbO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> using soft-proton-exchange process and segmentation technique. Measurements show that they can be favorably introduced between nonlinear or electrooptic part components, which require strong mode confinement to increase efficiency, coupling section with a standard optical fiber, requires low order have...

Light routing and manipulation are important aspects of integrated optics. They essentially rely on beam splitters which at the heart interferometric setups active routing. The most common implementations suffer either from strong dispersive response (directional couplers) or tight fabrication tolerances (multimode interference couplers). In this paper we fabricate a robust simple broadband splitter based lithium niobate with splitting ratio achromatic over more than 130 nm. Our architecture...

The abnormal domain kinetics in congruent lithium niobate single crystals caused by surface modification using proton exchange was studied experimentally. dependence of on polarity the growing domains at with revealed. smooth motion irregularly shaped walls finger-like features and correlated nucleation observed for growth Z + exchange. Such behavior drastically differs from jump-like plane oriented along Y directions both conventional –

The addition of small amounts (below 0.1 wt. %) multi-walled carbon nanotubes (MWCNTs) to Pb(Zr0.47Ti0.53)O3 (PZT) ceramics prepared by spark plasma sintering is proposed as a method tailoring the electrical properties, which are expected be modified with respect pure PZT, both result presence 1-D conductive fillers in ceramic product and via microstructural modifications induced during sintering. even strongly reduced sinterability PZT resulted porous fine-grained microstructures (relative...

We propose a new mode adapter which allows more efficient launching of the optical power selectively in fundamental multimode waveguide. Theoretical and experimental results confirm that such increases performances terms coupling efficiency, tolerances transmitted with respect to previously proposed solutions. Proof principle device operation is obtained simple Coupled Mode Theory model. Experimental are at wavelength 840 nm Lithium Niobate Soft Proton Exchanged waveguides agree very well...

Formation of abnormal domain shapes was studied in single crystalline LiNbO3 with surface layer modified by proton exchange. It has been shown that the isolated shape is very sensitive to electric field: 1) three-rayed stars and concave polygons appear low field, 2) hexagonal domains form moderate 3) oriented rays grow high field. The transformation from convex polygon fast growth narrow front growing wall were investigated. obtained behavior attributed non-effective external screening...

High-index contrast waveguides fabricated with precise control and reproducibility are of high interest for nonlinear and/or electro-optical highly efficient compact devices quantum classical optical data processing. Here, we present a new process to fabricate planar channel on lithium niobate substrates that called vacuum proton exchange (HiVacPE). The main purpose was improve the quality produced by limiting controlling water traces in melt, which is used ionic exchange. Moreover,...

Highly confining waveguides ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="m1"> <mml:mrow> <mml:mi mathvariant="normal">Δ</mml:mi> <mml:msub> <mml:mi>n</mml:mi> <mml:mi>e</mml:mi> </mml:msub> <mml:mo>&gt;</mml:mo> <mml:mn>0.1</mml:mn> </mml:mrow> </mml:math> ) without a degraded nonlinear coefficient and low propagation losses have been fabricated in lithium niobate (LN) by new process that we called high vacuum vapor-phase proton exchange (HiVac-VPE). Index...