Ferroelectric ceramic samples of lithium-niobate () material synthesized by solid-state reaction were investigated. Raman spectra analysis confirmed that the structure of these ceramics became more rigid with the rise of composition. Frequency and temperature dependencies of dielectric permitti...

For a wide range of applications in modern photonics, the low index contrast lithium niobate waveguides still offer the most established solutions to integrate a number of functions on a single optical chip. These waveguides are mostly single-mode at telecom wavelengths and knowing their index c...

Spherical 0.5–1 mm iron–manganese oxide with the Fe/Mn molar ratio of 2:1 (Fe67) was studied for thermochemical energy storage (TCES) system. Iron and manganese oxide are abundant, low-cost, and non-toxic; three ideal materials characteristics for TCES applications. Fe67 was reduced in both ar...

The effect of vanadium doping on the structural, dielectric and ferroelectric properties of Bi4Ti3O12 (BTO) has been studied. Bi4–x/3Ti3–xVxO12 (x = 0, 0.006, 0.012, 0.018, 0.024 and 0.03 mol%) were prepared using a sol–gel synthesis method and calcined at 400 °C for 3 h. All samples were si...

Lead-free bismuth sodium titanate-bismuth potassium titanate-barium titanate ceramic/cement composites with carbon nanotubes (CNTs) addition were developed for smart structures application. The pores in composite and insulating nature of the cement matrix made the poling difficult and lower piez...

Combined ab initio and experimental study of Mg-, Ca-, Sr-, Ba-doped bismuth titanate pyrochlores (BTO) has been carried out. It is revealed that the substitution of bismuth atoms by alkaline earth elements is a preferable process rather than the substitution of titanium atoms according to the s...

Bismuth titanate nanorods have been prepared using a facile hydrothermal process without additives. The bismuth titanate products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution TEM (HRTEM) and UV–vis dif...

In this research, hydrothermal process was used to synthesize Bi4Ti3O12 nanoparticles under supercritical water condition, and using Bi2O3 and TiO2 as precursors. The prepared nanoparticles were analyzed by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electr...

Cobalt- or Zn-doped bismuth titanates and Mg + Cu-doped bismuth niobate were synthesized by the method of organic-inorganic precursors combustion. Distribution of dopants over the sites of the pyrochlore structure was elucidated by X-ray powder diffraction structure refinement and pycnometric de...

An enhanced visible light photocatalytic performance of band-gap engineered bismuth titanate photocatalyst by tin and carbon (Sn&C) codoping is being reported in the present work. The photocatalyst sample was synthesized by the Pechini route and characterized by powder XRD, micro-Raman, XPS and ...

Ab initio investigation of the possibility of oxygen ion migration in non-stoichiometric bismuth titanate pyrochlore Bi1.5Ti2O6.25 has been performed. Density functional theory calculations together with the nudged elastic band method were used to estimate the O2– migration barriers. The migrat...

The development of new safe inorganic UV filters to effectively protect the skin from ultraviolet (UV) radiation effects is an emerging issue. Bismuth titanate-based UV filters embedded into mesoporous silica nanoparticles (MSN) represent a new class of inorganic sunscreens, with excellent UVA a...

In this research, thermal decomposition method was used to synthesize Bi12TiO20 nanoparticles under water-ethanolmedium, using Bi(NO3)3.5H2O and Ti(OC2H5)4 as precursors. The prepared materials were studied by X-ray diffraction (XRD), and Field emission scanning electron microscopy (FESEM). The ...

This work reports improvement in electric field-induced pyroelectric properties of polyurethane (PU) elastomer, brought about by the incorporation of strontium barium niobate, Sr0.3Ba0.7Nb2O6 (abbreviated SBN30) nanopowders with tetragonal tungsten bronze structure. Attempts have been made to de...

Vibrational Raman spectra have been measured for strontium barium niobate (Sr0.5Ba0.5Nb2O6, SBN50) single crystals and nanopowders doped with 1 mol% of the luminescent ions Eu3+ and Er3+. The nanocrystalline materials show slightly broader spectra with respect to the single crystals with the sam...

Strontium barium niobate (Sr0.5Ba0.5Nb2O6 and Sr0.6Ba0.4Nb2O6) single crystals doped with 1–2.5 mol% of the luminescent ions Eu3+ and Er3+ have been investigated using Raman and IR spectroscopy. The vibrational spectra of SBN crystals are dominated by broad and multi-component bands related to ...

The study of two different methods to obtain Strontium Barium Niobate nanocrystals has been carried out. Previously, Nd2O3 doped SrO–BaO–Nb2O5–B2O3 glasses were fabricated using the melt quenching process. In the first method, a thermal treatment in an electrical furnace at 620 °C was used t...

Single crystals of strontium barium niobate, SrxBa1-xNb2O6, doped with the lanthanide ions Pr3+, Nd3+, Eu3+, Er3+ and Yb3+, were grown for x in the range 0.33–0.75 using the flux growth technique. Emission and excitation spectra were recorded in the visible and near infrared range at room and l...

Undoped as well as K-doped (40%), Y-doped (40%), Zr-doped (10%), and Mo-doped (12.5%) strontium barium niobate Sr0.5Ba0.5Nb2O6 (SBN50) materials have been investigated to explore the effect of heavy doping on the structural and functional properties (thermo-power, thermal and electrical conducti...

The optical properties of erbium impurities in strontium barium niobate are investigated measuring optical absorption and emission in the visible and near infrared spectral region. For the main fluorescence band at 1.55 μm, an anomalous dependence of the fluorescence decay time on dopant concen...