Materials Literature
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The electrical conduction properties of rf sputter-deposited (Ba, Sr)TiO3 (BST) films on Pt and IrO2 electrodes and metalorganic chemical vapor deposited (MOCVD) BST films on a Pt electrode were investigated and a new energy band model that satisfactorily explains the observed leakage current characteristics and film…
The structure of the amorphous walls of the mesoporous material MCM-48 was investigated with a combination of high-resolution transmission electron microscopy and selected area electron diffraction, and the three-dimensional structure was reconstructed by electron crystallography. The crystals were well ordered over l…
Mn(N3)2(pyz) (pyz = pyrazine) consists of ferromagnetically coupled linear chains of {Mn(N3)2}n comprised of µ-1,1-azido bridges together with µ-pyz ligands to afford 2-D planar layers.
Optical storage properties of thin unoriented liquid crystalline and amorphous side-chain azobenzene polymethacrylate films are examined by polarization holographic measurements. The investigated materials are free radical copolymers derived from two photochromic monomers, 6-(4-oxy-4‘-cyanoazobenzene)hex-1-yl methacry…
The synthesis, structural characterization, and magnetic properties of a new Prussian blue analogue, the molecule-based ferrimagnet (V IV O)[Cr III (CN) 6 ] 2/3 · 10 / 3 H 2 O ( 1 ) ( T C = 115 K), are presented. The crystal structure is determined from the powder X-ray diffraction diagram using the Rietveld method. T…
The mechanical stability of homogeneous crystals has been the subject of extensive theoretical and computational studies. It has been suggested that Born stability conditions are only valid for the analysis of an unstressed lattice. The generalization of the elastic stability criteria to the non-zero stress case can b…
Reaction and sintering characteristics of mixtures of kaolin (Al2O3⋅2SiO2⋅2H2O) with BaCO3 or SrCO3 were investigated using kaolin and finely ground carbonate powders. Although the decomposition temperature of barium carbonate and strontium carbonate are higher than 1050°C, both carbonate powders decomposed at much lo…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Natasa Čegar, Ferenc Simon, Gabriel Baumgartner, Andrzej Sienkiewicz, László Forró, Barbara Ruzic…
SnO2 samples doped with x-mol % Mn (x = 0, 0.3, 0.5, 0.7, 1.0) were prepared by organic route, calcined at 800 C for 4h, and characterized by the Rietveld method with X-ray diffraction data. The Thompson-Cox-Hastings pseudo-Voigt profile function was used as it is in the DBWS 9411 Rietveld analysis software. For the F…
Low temperature superplasticity (LTSP) was observed in the 5083 Al–Mg base alloy after thermomechanical treatments (TMT). The maximum LTSP elongation was 400%, occurring at 250°C and 1×10−3 s−1. The subgrain structures formed during TMT transformed to better defined subgrains to ∼0.5 μm upon heating to 250°C. Further…
Calcite collectors often ask, “How many kinds of calcite twins are there?” The answer is hard to give because the word kinds is ambiguous. The question can be given an unambiguous answer, however, if the question is rephrased: “How many twin laws are there for calcite?” In this case, the answer is “four.” I will go fu…
The pressure dependence of the optical absorption edge of In1—xGaSe (0 < x < 0.2) and GaTe has been investigated in order to determine the direct to indirect crossover pressure and the energy difference between the absolute and subsidiary minima of the conduction band at ambient pressure. In the In1—xGaSe alloy, the c…
During the recrystallization microalloyed Sn in non-oriented electrical steel segregates to the surface and on grain boundary and affects the texture development. In spite of the fact that the grain boundary segregation is much smaller compared to surface segregation, both have an influence on recrystallization and on…
The chemical bond parameters, that is, bond covalency, bond susceptibility, and macroscopic linear susceptibility of La1−xCaxCrO3 (x=0.0, 0.1, 0.2, 0.3) has been calculated using a semiempirical method. This method is the generalization of the dielectric description theory proposed by Phillips, Van Vechten, Levine, an…
Batch culture of Alcaligenes latus, American Type Culture Collection 29713, was investigated for producing the intracellular bioplastic poly(b-hydroxybutyric acid) (PHB). A central, composite experimental design was used to optimize the composition of the culture medium for maximizing the productivity of PHB. Investig…
The topic of this paper is bipolar organic compounds containing both charged electron donor and electron acceptor groups interconnected by various kinds of bridges (–D–X–A+). Such betaines are subject to photoinduced intramolecular electron transfer (PIET), large change in dipole moment in the excited state and consid…
(1999). Super-Hard Wear-Resistant Coating Systems. Materials Technology: Vol. 14, No. 3, pp. 126-129.
The ferroresonant behaviour of a 275 kV electromagnetic voltage transformers, fed from a sinusoidal supply via circuit breaker grading capacitance, in a National Grid substation in analysed using nonlinear bifurcation diagrams representing system behaviour have been presented showing two possible types of operation, n…
Department of Chemistry, Yonsei University, Seoul 120-749, KoreaReceived November 10, 1998The polyaniline films with various insoluble parts are fabricated. The oxidation state (1-y) of these polyanilineis 0.53 and 0.54, respectively. To control the interchain and intrachain interaction of the polymer, the polya-nilin…
Previous work has shown that polymethacrylates with highly tapered side groups, such as poly{2-{2-[2-(2-methacryloyloxyethoxy)-ethoxy]ethoxy}ethyl-3,4,5-tris-(p-dodecyloxy-benzyloxy)benzoate} (H12-ABG-4EO-PMA), form columnar hexagonal (Colh, previously designated φh) liquid crystalline structures. The small angle X-ra…