Materials Literature
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We prepared multiferroic Y-type hexaferrite Ba0.5Sr1.5Zn2Fe12O22 ceramics and compared their magnetic and dielectric properties with single crystal. Magnetic susceptibility and microwave resonance measurement revealed magnetic phase transition at TC=312 K, similar as in single crystal. Ferroelectric (FE) phase can be…
Red (Ho3+:F55→I58), green (Ho3+:S52,F54→I58), and blue (Tm3+:D12→F34 and G14→H36) upconversion emissions were simultaneously generated in the transparent glass ceramics containing Nd3+/Yb3+/Tm3+/Ho3+:β-YF3 nanocrystals under 796 nm excitation. It was experimentally evidenced that Yb3+ ions acted as the bridging center…
The mechanical and the electrical properties of polypyrrole (PPy) fibers and electrochemically deposited PPy films were studied. It was found that the PPy fibers showed a significantly higher strength than the PPy films due to better orientation of the molecular structure. The electrochemically prepared PPy films had…
Oxide semiconductors are attractive materials for thin-film electronics and optoelectronics due to compatibility with synthesis on large-area, inexpensive glass and flexible plastic substrate. However, development of thin-film electronics has been hampered by the limited number of semiconducting oxides that are p-type…
Colloidal semiconductor nanomaterials exhibit color modulation which can be useful for various optoelectronic and biolabelling applications. Previous studies on CdSe and CdTe have shown tunable color modulation by varying the size of nanomaterials but toxicity of cadmium has created doubt for its end applications as b…
The atomic composition, structural, morphological, and optical properties of N-rich copper nitride thin films have been investigated prior to and after annealing them in vacuum at temperatures up to 300 °C. Films were characterized by means of ion-beam analysis (IBMA), X-ray diffraction (XRD), atomic force microscopy…
In the present study, structural and magnetic properties of Mn-rich, off-stoichiometric, nanocrystalline Ni–Mn–Sn ferromagnetic shape memory alloy thin films, grown on Si (100) substrates at 550 °C by dc magnetron sputtering have been systematically investigated. The crystallization, surface morphology, and structural…
Hydrothermal grown n-type ZnO samples have been investigated by deep level transient spectroscopy (DLTS), thermal admittance spectroscopy (TAS), temperature dependent Hall effect (TDH) measurements, and secondary ion mass spectrometry (SIMS) after thermal treatments up to 1500 °C, in order to study the electrical prop…
The ferroelectric hysteresis loops of 63PbTiO3−37BiScO3 ceramics were measured under sinusoidal electric fields in the range of frequency from 0.1 to 100 Hz and field from 5 to 55 kV/cm. The fitting results showed two linear relations existed between the logarithm of hysteresis area ⟨A⟩ and the logarithm of the amplit…
Epitaxial magnetoelectric (ME) Pb(Zr0.53Ti0.47)O3(PZT)/CoFe2O4(CFO) multilayer nanocomposite thin films with up to 11 alternative layers are grown on Nb doped SrTiO3 (STO) substrates by pulsed-laser deposition. X-ray diffraction and high resolution transmission electron microscopy studies reveal a good epitaxial relat…
The electronic structures of hexagonal boron nitride (BN) bilayers are studied by first principles calculations. The stabilities of BN bilayers with various stackings are determined. We find that an external electric field could significantly modulate the energy gaps of BN bilayers. By a relatively small adjustment of…
The work functions of nanocrystalline anatase (TiO2) thin films and a rutile single crystal were measured using photoemission spectroscopy (PES). The nanocrystalline titanium dioxide films were deposited in-vacuum using electrospray thin film deposition. A comparison between ultraviolet photoemission spectroscopy (UPS…
The optical properties of bulk ZnO ion implanted with nitrogen ions, at an energy of 23 keV have been studied as a function of implantation fluence and electron beam (EB) annealing conditions. Nuclear reaction analysis and Raman results have revealed the implanted N concentration and its structural changes with respec…
The electronic structure of Cu-doped ZnO thin films, synthesized with a nominal composition of Zn1−xCuxO (x=0.03, 0.05, 0.07, and 0.10) by using spray pyrolysis method, has been investigated using near-edge x-ray absorption fine structure (NEXAFS) experiments at the O K- and the Cu L3,2-edges and resonant inelastic x-…
This study reports on the determination of the optical constants of a lead-free ferroelectric material, Na0.5Bi0.5TiO3. The optical transmission measurements were carried out in the 300–3000 nm wavelength range, on a (100)-oriented Na0.5Bi0.5TiO3 thin film, epitaxially grown by laser ablation on a (100)MgO single crys…
Polycrystalline multiferroic La0.8Bi0.2Fe1−xMnxO3 (0.0≤x≤0.4) samples were synthesized by the conventional solid state reaction method. Reitveld refinement of the x-ray diffraction patterns confirms the single phase character of all the compositions with orthorhombic structure having space group Pnma (No. 62). Dielect…
The dielectric nonlinearity of BaTiO3 ceramics with grain sizes from 1.2 to 76 μm was investigated using the ac electric field dependence of the dielectric properties and the first order reversal curves (FORC) distribution. Defect dipoles in samples with large grains led to pinching of minor polarization-electric fiel…
We report a new curing procedure of a plasma enhanced chemical vapor deposited SiCOH glasses for interlayer dielectric applications in microelectronic. It is demonstrated that SiOCH glasses with improved mechanical properties and ultralow dielectric constant can be obtained by controlled decomposition of the porogen m…
Novel bowl-like single-crystalline BaTiO(3) nanoparticles were synthesized by a simple hydrothermal method using Ba(OH)(2)·8H(2)O and TiO(2) as precursors. The as-prepared products were characterized by XRD, Raman spectroscopy, SEM and TEM. The results show that the bowl-like BaTiO(3) nanoparticles are single-crystall…
In a recent theoretical work by the authors, a new theoretical approach to the cut-pile carpet compression based on elastic stored energy was developed. In this study, cut-pile compression behavior was experimentally investigated and the proposed theoretical model verified. Cut-pile carpet samples with three types of…