Materials Literature
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Hysteretic loop measurements of hydrostatic piezoelectric coefficient as a function of temperature and pressure for the lead-free ferroelectric ceramic 0.79(Bi0.5Na0.5)TiO3 – 0.14(Bi0.5K0.5)TiO3 – 0.07BaTiO3 (BNBK79), were realized. Curves of dh – E relation were obtained under applied electric field along polar axis…
The effects of substituting Na+ for Bi3+ on the sintering properties, the microstructure and the dielectric properties of Bi2(Zn1/3Nb2/3)2O7 -based ceramics were investigated. The results reveal that the sintering temperature of (Bi2−xNax)(Zn1/3Nb2/3)2O7 (x = 0.1, 0.2, 0.25, 0.3, 0.35, 0.4, 0.5 and 0.6 mol) ceramics d…
The reaction of the complexes trans-[RuII(NO+)(NH3)4L] and [RuII(NO+)HEDTA] with 2,2-diphenyl-1-picrylhydrazyl (DPPH•) and hydroxyl (OH•) radicals has been investigated at 25.0 ± 0.1 °C using spectroscopic (UV-vis and electron paramagnetic resonance) and electrochemical techniques (differential pulse voltammetry and c…
The dispersion analysis of the dielectric spectra of the perovskite ceramics, CaTiO3, and perovskite-like monocrystalline thin films (Ba,Sr)TiO3 deposited on a monocrystalline MgO substrate is carried out. The giant LO–TO splitting (∼700 cm−1) of the lowest-frequency absorption band (the soft mode) is found. Due to th…
The objective of this work was to study the effects of washing and purification steps on qualitative and quantitative analysis of fecal stanols in the oyster Crassostrea gigas using either single or a combination of lipid purification steps on silica gel or aminopropyl bonded silica gel (NH2) or a washing step. Among…
Aluminum-induced crystallization (AIC) has been used to achieve device quality nc-Si thin films, at annealing temperatures ranging from 300 to 450 °C, exhibiting electronic properties favourable for piezoresistive microelectromechanical systems sensor application. The nc-Si films obtained by AIC at an annealing temper…
Background. Biopolymers are used as vehicles for the carrying drugs to their site of action. These polymers are less toxic and can even protect the drug entity from degradation in physiological conditions of the body. Large number of techniques are employed to prepare the nanoformulation of these polymers but ionic ge…
The (Ba1-xNax)(Ti1-xNbx)O3 (BNTNx) ceramics have been obtained from oxides by means of a conventional method. The structure and morphology of the investigated samples were characterised by an X-ray diffraction (XRD) and scanning electron microscopy (SEM). The thermal analysis of the phase transitions was performed wit…
We present a detailed investigation of structural properties of manganese doped strontium titanate ceramics and Verneuil grown single crystals, the last prepared with Sr deficiency compensated by proper Mn amount. EXAFS, TEM, ESR and Raman techniques, combining local and lattice probes, allows to inspect the local che…
The dielectric and ferroelectric properties of Fe-doped BaTiO3 ceramic under uniaxial stress applied perpendicular and parallel to the electric field are presented and analyzed. For the dielectric properties, the results showed that the uniaxial stress reduced an electric permittivity and dielectric losses for the bot…
Polycrystalline samples (Ba1-xSrx)(Ti1-xZrx)O3 for x = 0.01, 0.05 and 0.10 (abbreviated to BSTZ1, BSTZ5 and BSTZ10) were obtained by means of a conventional ceramic technology. The EDS and EPMA measurements revealed that the samples were perfectly sintered, chemically homogeneous and confirmed their high quality. The…
Dielectric, structural and pyroelectric properties of the Pb0.525Ca0.475TiO3 (PCT47.5) ceramic system were investigated for temperatures ranging from cryogenic up to 570 K. Two anomalies were observed in the temperature dependence of the dielectric permittivity and of the pyroelectric coefficient. A structural refinem…
A lead-free solid solution BaTiO3 and BaTi0.90Hf0.10O3 were prepared by a conventional technology. The structure and morphology of the investigated samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The impedance and modulus spectroscopic analyses were carried out. The obtain…
The preparation of 9-alkyl-9-borafluorenes and their use as radical precursors in chain reactions were investigated. These organoboranes were found to be excellent precursors of primary and secondary alkyl radicals. Reactions were readily initiated by traces of oxygen and efficient processes involving sulfonyl-based r…
Lead free bulk ceramics manganese doped ceramics (1-x)(K0.5Na0.5)NbO3-xMnO2 (0 ≤ x ≤0.8 mol%, KNN-Mn-x) were prepared by a conventional solid-state sintering technique. Effects of manganese on the phase structure, morphologies and electrical properties of KNN ceramics were investigated. Mn-doped ceramics exhibited goo…
Thin films of PbSe are prepared by vacuum deposition technique on to well cleaned glass substrates. Thin film capacitors of the type (Al-PbSe-Al) have been fabricated. AC Conduction and Dielectric studies performed on samples of thickness 300,500 and 700nm at various frequencies (10kHz-10MHz) and temperatures (293K-49…
This paper focuses on the process of electrorheological (ER) finishing optical surfaces. Experiments on K9 mirrors were conducted. In one experiment, the operating distance was varied over 0.5–0.8 mm with the voltage at 2000 V. The maximum peak-to-valley ( PV ) reduction was obtained at the distance of 0.5 mm, where t…
A novel non-doped blue-emitting material, 2,2′:6′,2″-ternaphthalene (NNN), which is based on three naphthalene units forming a rodlike molecule, has been synthesized and characterized. Organic light-emitting diodes based on NNN as emitter exhibit blue emission with Commission Internationale de l’Eclairage color coordi…
The effect of annealing in Ni doped Zinc oxide (ZnO) semiconductor thin films grown by a modified SILAR method is presented in this study. The XRD diffraction patterns reveal good crystalline quality without any appreciable changes from pure ZnO films and are genuinely polycrystalline with a hexagonal wurtzite structu…
(Bi1/2Na1/2)(Mn1/2Nb1/2)O3 (BNMNO) ceramics were sintered at ambient air. XRD test exhibited coexistence of phases. The permittivity and conductance were measured at radio frequencies. Activation energy values were estimated as 0.38 eV. Electronic structure was simulated for BNMNO and also for BiMnO3 (BMO) as the refe…