Materials Literature
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Recent progress in experimental understanding of the A-Mg-R (A=Zn and Mg, R=rare-earth elements) magnetic quasicrystals is reviewed. The A-Mg-R quasicrystals have long been classified as spin-glasses because of their typical spin-freezing behavior at low temperatures. On the other hand, recent neutron diffraction expe…
Conductivity κ of propylene carbonate-diethyl carbonate (PC-DEC) and propylene carbonate-ethylene carbonate (PC-EC) solutions of lithium bis(oxalato)borate (LiBOB) was experimentally determined at temperatures θ from 60 to salt molalities from 0.04 to and solvent compositions from 0 to 0.7 weight fraction of DEC and E…
The crystal chemistry, thermal expansion behavior, electrical conductivity, chemical compatibility, and electrochemical performance in intermediate temperature solid oxide fuel cells (SOFCs) of perovskite oxides have been investigated. The samples crystallize in an orthorhombic structure, and the lattice volume increa…
Molecular analogues of the building units found in synthetic and natural zeolites can be synthesised with a number of different architectures and chemical compositions. These molecules can then be used as a platform for the synthesis of different types of material. In this article I will discuss the types of zeolite-l…
Landau-type theories describe the observed behaviour of phase transitions in ferroelastic and co-elastic minerals and materials with a high degree of accuracy. In this review, the derivation of the Landau potential G=1/2AthetaS [coth(thetaS/T)-coth(thetaS/TC)]Q2 + 1/4BQ4 + ... is derived as a solution of the general p…
Rodlike gold(I) complexes, [Au(C6F4OCmH2m+1)(C(triple bond)NC6H4C6H4OCnH2n+1)] (m=2, n=4, 10; m=6, n=10; m=10, n=6, 10), display interesting features. They are liquid crystals and show photoluminescence in the mesophase, as well as in the solid state and in solution. The single-crystal, X-ray diffraction structure of…
Abstract Mechanical properties (tensile, flexural, impact, and dynamic mechanical thermal analysis) of novolac type phenolic composites reinforced with jute/cotton hybrid woven fabrics were investigated as a function of fiber orientation and roving/fabric characteristics. Scanning electron microscopy (SEM) was carried…
Yttria-stabilized zirconia (YSZ) electrolyte disks with patterned Sr-doped LaMnO 3 (LSM) electrodes having different three-phase boundary (TPB) lengths ( l TPB ) , but the same electrode-electrolyte interface area, were prepared using photomicrolithography. Impedance spectra for half-cells were obtained under oxygen p…
Many of the mutagenic or lethal effects of ionization radiation can be attributed to damage caused to the DNA by low-energy electrons. To gain insight on the parameters affecting this process, we measured the low-energy electron (<2 eV) transmission yield through self-assembled monolayers of short DNA oligomers. The e…
Homogeneous surface coating of long carbon nanotubes is achieved by in situ polymerization of ethylene as catalyzed directly from the nanotube surface-treated by a highly active metallocene-based complex and allows for the break-up of the native nanotube bundles leading, upon further melt blending with HDPE, to high-p…
An overview is presented of low-dimensional electronic crystals that undergo a phase transition towards a low-temperature charge-density-wave (CDW) state. The emphasis is on inorganic compounds that develop an one-dimensional (1D) CDW. Low-dimensional features of crystal structures are discussed in relation to 1D elec…
Generalizing the procedures of Girifalco and of Verheijen et al. and using results of the preceding work it has been derived the interaction potential between the molecules of different fullerenes Cn and Cm at orientationally disordered (high-temperature solid and gaseous) phases. We have calculated the coefficients f…
Magnetization-induced optical third-harmonic generation (MTHG) is observed in magnetic nanostructures: Co and Fe nanolayers and granular films containing Co nanoparticles. Magnetization-induced variations of the MTHG characteristics in these nanostructures exceed the typical values of linear magneto-optical Kerr effec…
Electrochemical double-layer capacitors with micro-to-nanoporous electrodes based on activated carbon utilize the gross interface between carbon and the electrolyte, which fills the pores of two main classes, ( i ) micrometer voids between agglomerates of carbon grains and ( ii ) micro-to-nanometer pores inside agglom…
Crystallographic features and stability of the tetragonal phase of PbVO 3 were investigated under ambient and high pressure and compared with those of PbTiO 3 . PbVO 3 is isotypic with PbTiO 3 [at 300 K, space group P 4 mm; a = 3.803 91(5) Å and c = 4.676 80(8) Å, Z = 1]. Tetragonality ( c / a ) of PbVO 3 was the larg…
[Structure: see text] Anthracene derivatives with a variety of donor-acceptor substituents have been synthesized and shown to exhibit large two-photon cross sections over a wide range of wavelengths.
La1-xCaxMnO3+delta and La1-xNaxMnO3+delta samples with well defined cation molecularity and oxygen contents are analyzed with XRPD, electrical conductivity, electron paramagnetic resonance and static magnetization measurements. Point defects are introduced in the structure by: i) aliovalent cation doping (substitution…
We consider free electrons in rectangular quantum dots, with either hard wall boundary conditions or anharmonic confinement. In both cases, due to finite size effects, a homogeneous electric field applied along one of the rectangular axis is shown to induce abrupt changes in the electron density, parallel and perpendi…
A simple four-sublattice order-disorder model is developed for description of phase transitions and dielectric properties of the Rochelle salt crystal. The model is developed as a generalization of the semimicroscopic Mitsui model. The symmetry properties of lattice and spatial orientations of effective dipoles connec…
The crystallographic and magnetic properties of La{0.5+delta}A{0.5-delta}Mn{0.5+epsilon}Ru{0.5-epsilon}O{3} (A= Ca, Sr, Ba) were investigated by means of neutron powder diffraction. All studied samples show the orthorhombic perovskite crystal structure, space group Pnma, with regular (Mn,Ru)O{6} octahedra and no chemi…