With the purpose of fabricating ceramics where ferroelectric and magnetic order coexist, Pb(Fe1∕2Nb1∕2)O3 have been prepared using traditional ceramic method following three different routes. The first is a direct via starting from oxide reagents other two use kinds FeNbO4 precursors with either monoclinic or orthorhombic structures. Crystallographic surface morphological studies were carried out by powder x-ray diffraction scanning microscopy techniques. presence Fe2+, detrimental to...

The dielectric behavior of ferroelectromagnetic Pb(Fe1∕2Nb1∕2)O3 ceramics obtained using the traditional ceramic method employing three different precursors was investigated by impedance spectroscopy in temperature range 200–300°C. This study carried out means simultaneous analysis complex Z̃, electric modulus M̃, and admittance Ỹ functions from measurements frequency 20Hz–1MHz. In correspondence to a previous structural, morphological, response study, appropriate microstructural equivalent...

The values of the optical constants magnesium fluoride (MgF(2)) and zinc sulfide (ZnS) thin films are obtained using a classical oscillator model experimental their spectral transmittance. Auger electron spectroscopy was performed on samples to determine chemical composition films. These materials important in design filters, mirrors, antireflection coatings for instrumentation. Unfortunately properties strongly depend evaporation conditions. procedure described here allows direct...

Abstract The hybrid halide perovskite CH3NH3PbI3-based humidity sensors demonstrate significant progress in detection range, response time, and durability. These improvements are attributed to the ionic conductivity of material, tunable bandgap, defect engineering. Simultaneously, their energy conversion devices, such as solar cells, has achieved remarkable efficiency gains, exceeding 25%. key challenges for commercializing these devices moisture-induced degradation, lead toxicity,...

Successful substitution of Co for Fe in the R 3 c structure BiFe 0.9 0.1 O . The improved magnetic response and intriguing optical behavior suggest applications as voltage-controlled devices spintronics or optoelectronic devices.

The influence of Pr ion on the structural and dielectric properties was studied in Sr1−xPrxTiO3 for 0<x<0.075 composition from room temperature to 375°C. X-ray diffraction x-ray photoelectron spectroscopy studies revealed that praseodymium enters substitutionally Sr site with mixed valence a Pr+3∕Pr+4=2:1 ratio. This substitution yields compressive chemical pressure lattice. polarization measurements at display hysteresis loops, indicating induces ferroelectric behavior...

The sol-gel route was used to synthesize a series of compounds the system Bi

Dielectric relaxation processes occurring near the ferroelectric-paraelectric phase transition of ferroelectromagnetic Pb(Fe1∕2Nb1∕2)O3 ceramics obtained by different precursors are discussed using microstructural and equivalent circuit modeling impedance spectroscopy technique. The frequency-temperature response was from room temperature to 300°C 20Hzto1Mz. In correspondence with a previous structural, morphological, study, appropriate microstructural, models were established. frequency...

In this study, (011)-highly oriented Sr, Nb co-doped BiFeO3 (BFO) thin films were successfully grown on SrRuO3/Si substrates by rf-magnetron sputtering. The presence of parasite magnetic phases was ruled out based the high resolution x-ray diffraction data. BFO exhibited a columnar-like grain growth with rms surface roughness values ≈5.3 nm and average sizes ≈65–70 for samples different thicknesses. Remanent polarization (2Pr) 54 μC cm−2 at room temperature found ferroelectric behavior...

Strontium titanate modified with praseodymium was investigated by means of a combination synchrotron x-ray diffraction and thermal analysis at high low temperatures. The data obtained room temperature revealed breakdown the cubic symmetry via (002)/(200) split peaks. Thus, both diffuse anomaly in DTA measurement permittivity peak indicate that is reached about 455 K. At temperatures, specific heat reveals two anomalies ∼105 ∼37 Both were sensed for phonon part total heat. soft acoustic modes...

Multifuncionality in polycrystalline multiferroic ceramics can be improved using an advanced synthesis process. In this work, core-shell design is being proposed to enhance the transport properties of biferroic YCrO3. The atomic layer deposition (ALD) thin-film growth technique was used for YCrO3/Al2O3 (Y@Al) nanocomposite fabrication. A continuous, amorphous, and uniform Al2O3 shell, a few nanometers thick, obtained characterized by X-ray photoelectron spectroscopy, diffraction,...

Multiferroic samples with composition (1-x)BiFeO3-(x)(Ba0.70Sr0.30)TiO3 (BFO-BST) were synthesized using a sol-gel route to study the effect of BST doping on structural, transport, and magnetic properties in BiFeO3 (BFO). X-ray diffraction studies Rietveld analysis revealed that phase transition occurred from rhombohedral (R3c) (0.0 ≤ × 0.15) tetragonal (P4 mm) for x = 0.20 nanocrystalline nature confirmed by transmission electron microscopy measurements. Piezoelectric improved as increased...

Abstract A novel superparamagnetic state has been observed in high quality La 0.7 Sr 0.3 MnO 3 (LSMO) thin films directly grown by rf-sputtering on SiO x /Si(100) substrates. The are nanostructured without grain boundaries, constituted locally epitaxial nanoregions layer-by-layer with out-of-plane (012) preferential orientation, induced the constrain of native silicon oxide. Low magnetic field ZFC-FC magnetization curves show a cross-over from to ferromagnetic dependent thickness. thicker...

Electromagnetic radiation of electric dipoles, which are placed near a metallic surface and excited by the ongoing polaritons, is investigated. The dipoles used to represent scattering centers, irregulars, mesoscopic particles. A formalism distinguishes evanescent field propagating waves in dipole employed calculate scattered polariton near- far-field zones. Numerical studies local at sites were carried out for 50 with various distances between surface. An enhanced was obtained some cases,...

This study is focused in the conduction processes taking place 0.6 wt % Gd doped lead zirconate titanate samples PbZr0.53Ti0.47O3:Gd (PZT53/47:Gd) vicinity of morphotropic phase boundary. Doped show very large dielectric permittivity with respect to that undoped ones near transition temperature. The frequency dependent ac conductivity PZT53/47:Gd ceramics was studied 30–450 °C temperature range. X-ray diffraction analyses indicate incorporation atoms structure. changes properties as...

Multifunctional multiferroic materials such as the single phase compound Pb(Fe0.5Nb0.5)O3 (PFN), where ferroelectric and antiferromagnetic order coexist, are very promising have great interest from academic technological points of view. In this work, coupling magnetic moments is reported. For study, a combination small signal response using impedance spectroscopy technique electromechanical resonance method with large through standard hysteresis measurement, has been used without an applied...