Materials Literature
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Abstract Carbon nanotubes are attractive new materials. It has been about a decade since carbon nanotubes were discovered. Carbon nanotubes have many outstanding properties and have many practical or potential applications. In this short review we introduce recent advances in carbon nanotubes as potential material for…
Recent demonstrations of negative refraction utilize three-dimensional collections of discrete periodic scatterers to synthesize artificial dielectrics with simultaneously negative permittivity and permeability. In this paper, we propose an alternate perspective on the design and function of such materials that exploi…
The title complex, (nBu4N)+[(HCPz3)Ce(NO3)4]− or (C16H36N)[Ce(NO3)4(C10H10N6)], which is the first lanthanide(III) complex of tris(pyrazolyl)methane (HCPz3), is 11-coordinate. The Ce—O and Ce—N bond lengths are in the ranges 2.514 (3)–2.685 (3) and 2.686 (4)–2.761 (4) Å, respectively.
Cu-substituted Z-type ferrite (Ba 3 Co 2- x Cu x Fe 24 O 41 , where X =0, 0.2, 0.4, 0.6 and 0.8) powders were synthesized using a citrate precursor method. Single Z-type phases were found by X-ray diffraction to form at a relatively low temperature of 1100–1150°C. With an appropriate sintering aid, highly dense Cu-sub…
In order to search for relaxor ferroelectrics or relaxor antiferroelectrics in Pb-excluded substances, ferroelectric and antiferroelectric mixed crystals Rb 1- x (NH 4 ) x H 2 PO 4 are investigated from the theoretical viewpoint of the precursor to glass state. Both boundary regions between ferroelectric (FE) and glas…
We have heteroepitaxially deposited pure and TiO 2 -doped Ba 0.6 Sr 0.4 TiO 3 (BST-0.4) films on (001)-oriented MgO substrates using pulsed-laser deposition. By optimizing microstructures, we have successfully increased the dielectric nonlinearity and decreased the dielectric loss of BST films. By inserting a very thi…
The synthesis of 6-(2,5-dimethoxy-4-(2-aminopropyl)phenyl)hexylthiol, an agonist with a very high affinity for the 5HT2A serotonin receptor subtype is reported. This agonist was designed to be attached to highly fluorescent cadmium selenide/zinc sulfide core/shells via a thiol at the end of a linker arm. This conjugat…
The electrooptical (EO) characteristics of polymer-stabilized ferroelectric liquid crystals (PSFLCs), which are fabricated by UV photocure of doped monoacrylates with mesogenic side chains at a temperature where the LC medium is in the SmC * phase under the simultaneous application of a bipolar square-pulsed AC electr…
2.0-µm-thick Pb(Zr x Ti 1- x )O 3 (PZT) films were grown with the deposition rate of 1.5 µm/h on (111)Pt/TiO 2 /SiO 2 /Si substrates at 600°C by metalorganic chemical vapor deposition (MOCVD). Moreover, their electrical properties were investigated as a function of the film thickness and the Zr/(Zr+Ti) ratio, x . The…
The dielectric properties of the c -oriented SrBi 2 Ta 2 O 9 (SBT) thin films are investigated with interdigital surface electrodes. The films are grown directly on MgO (100) substrates by pulsed laser deposition. The typical values of dielectric constant and dissipation factor at 100 kHz for 100-nm-thick SBT films ar…
Submicron particles of potassium niobate KNbO 3 were prepared by a colloid chemistry method. A rock-salt-type KF block in a layered perovskite, K 2 NbO 3 F, with a K 2 NiF 4 type structure was selectively dissolved in water to produce perovskite nanosheets at room temperature. The self-assembly between perovskite nano…
Ferroelectric Pb(Zr,Ti)O 3 (PZT) thin films with various Zr/Ti ratios were fabricated by ink-jet printing (IJP). Two kinds of precursor solutions for PbTiO 3 (PT) and PbZrO 3 (PZ) were prepared from Pb(OCOCH 3 ) 2 ·3H 2 O, Ti[OCH(CH 3 ) 2 ] 4 and Zr(OC 4 H 9 ) 4 . Seven 1 ×1 cm 2 square patterns with mixing ratios PT:…
We discuss electrode-dielectric interfaces in ferroelectric thin films and thin films that have high dielectric constants. We consider the charge on the electrodes in several cases, and focus on the effects that arise from this charge being distributed over a finite length (i.e. the Thomas-Fermi screening length). The…
Pristine, W and Mn 1% doped Ba 0.6 Sr 0.4 TiO 3 epitaxial thin films grown on the LaAlO 3 substrate were deposited by pulsed laser deposition (PLD). Dielectric and ferroelectric properties were determined by the capacitance measurements and X-ray diffraction was used to determine both residual elastic strains and defe…
An atomic force microscope (AFM) probing system was connected with a ferroelectric test system to measure the polarization hysteresis ( P – E ) curve and longitudinal displacement properties simultaneously with a large AC drive signal at 5 Hz, since this measurement system has the advantages of enabling dynamic evalua…
The two-layered SrBi 2 Nb 2 O 9 (SBN) ceramic resonator that generates second harmonics of the thickness extensional vibration is a strong candidate for fine-tolerance-resonator applications, because of its small electromechanical coupling coefficient and high temperature stability. The Nd substitution of Sr in SBN is…
Dispersing fine particles into a sol-gel matrix is a promising process to get a thick 0–3 composite coating layer. In this paper, we have further improved this modified sol-gel process by nanocrystalline composite technique to realize the low temperature annealing. Dense Pb(Zr, Ti)O 3 (PZT) thick films of 10 to 50 µm…
Lanthanoid (M 3+ =La 3+ , Pr 3+ , Nd 3+ and Sm 3+ )-substituted and lanthanoid/vanadium (V 5+ )-cosubstituted bismuth titanate thin films were fabricated on (111)Pt/Ti/SiO 2 /(100)Si substrates by a chemical solution deposition (CSD) technique. All the films consisted of a polycrystalline structure with random crystal…
Titanium-containing alkoxide (Ti[i-OCH(CH 3 ) 2 ] 4 ) dissolved in 2-methoxyethanol was directly deposited onto silicon by the metalorganic decomposition (MOD) technique. Titanium oxide (TiO 2 ) thin films are formed uniformly on Si after high-temperature annealing. Raman and X-ray diffraction measurements indicate th…
Temperature dependent polarized transmission intensity studies in strongly converging and parallel light beams had been accomplished for off-zone-center incommensurate semiconductors-ferroelectrics TlInS 2 , TlGaSe 2 and TlGaS 2 having a layered structure and reportedly a C 2 h 6 space group of symmetry at room temper…