Materials Literature
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Two previously undetected automerization processes occur among C3H2 isomers. On irradiation at λ = 313 nm, compounds 1a,b equilibrate via 3a,b; irradiation of compounds 2a,b at longer wavelengths (λ>444 nm) also leads to their interconversion, perhaps via a cyclopropyne intermediate or transition state.
The growth of twin-free single crystals of Tb0.3Dy0.7Fe2 with 〈111〉 orientation by the Czochralski method with cold crucible is reported. Various characterizations demonstrated the twin-free and single-crystalline quality of the crystals. The optimized growth parameters have been experimentally found to avoid constitu…
Antiferroelectric lead zirconate thin films were formed on platinum coated silicon substrates by a reactive magnetron co-sputtering method. The films showed (240) preferred orientation. The crystallization temperatures and the preferred orientation were affected by the lead content in the films. The electric field for…
The specific linking of two dendrimers is achieved by incorporating terpyridine moieties at precise locations in cascade molecules. Metal complex formation then enables nonrandom attachment of one dendritic assembly to another (see picture). The electronic properties of the metal depend on the dendritic environment.
Abstract Paleosols in the Lochness Formation (1.8 Ga, Australia) include both rare, non-red and abundant, strongly reddened varieties that formed at subaerial exposure surfaces in both ephemeral-river and lacustrine settings. Physical processes dominated non-red paleosols, which were characterized by repeated episodes…
The synthesis is simple, the structure very unusual. The [Pb18I44]8− ion (shown on the right), as a fraction of the NaCl structure type, is the largest iodoplumbate with discrete anions reported to date. The anion is obtained in the reaction of PbI2 with NaI in acetone as the tetrabutylammonium salt in the form of hig…
Komplexe Cluster mit der Größe von Proteinen können in reduzierten Molybdatlösungen durch Verknüpfung definierter Fragmente entstehen. Ein Beispiel hierfür ist (NH 4 ) 25 ± 5 [Mo 154 (NO) 14 O 420 (OH) 28 (H 2 O) 70 ] · ca. 350 H 2 O mit einer Molmasse von ca. 30 000 g mol −1 , dessen Anion eine einzigartige reifenähn…
In situ atomic force microscopy has been used to investigate step dynamics and surface evolution during the growth of single crystals of canavalin, a protein with a well known structure. Growth occurs by step flow on complex dislocation hillocks, and involves the formation and incorporation of small, mobile molecular…
The influence of surfactants on semiconductor thin film growth is studied by means of a mesoscopic model combined with first principles calculations. We introduce a new kinetic mechanism that explains how surfactants induce layer-by-layer growth. The experimentally observed high density of 2D islands is a natural cons…
Ab initio molecular dynamics simulation is used to study the structure and electronic properties of the liquid Ga-Se system at the three compositions Ga$_2$Se, GaSe and Ga$_2$Se$_3$, and of the GaSe and Ga$_2$Se$_3$ crystals. The calculated equilibrium structure of GaSe crystal agrees well with available experimental…
The frequency-dependent viscoelastic shear modulus of concentrated suspensions of colloidal hard spheres is shown to be strongly modified as the volume fraction approaches the glass transition. The elastic or storage component, ${G}^{\ensuremath{'}}$, becomes larger than the viscous or loss component, ${G}^{\ensuremat…
Stable to surfactant removal by calcination , Ti‐TMS1 is the first hexagonally packed, mesoporous transition metal oxide. The synthesis of this new material was achieved by a modified sol–gel technique from titanium alkoxides and phosphate surfactants. The large internal surface area, narrow and controllable pore size…
Transparent ferroelectric PLLZT ceramics were prepared by partial substitution of (La0.5Li.5) complex ions for Pb ones in Pb(Zr,Ti)O3. Chemical formula of the ceramics is presented as [Pb1 − x (La0.5Li0.5) x ] (Zr x Ti1 − x )O3. In the range of 0 <x < 0.6, the ferroelectric properties were similar to those of PLZT. Li…
A new experimental system has been constructed to test ITER relevant distillation columns and related cryogenic distillation (CD) hardware and control systems. These columns are used to purify tritium in the ITER fuel cycle. The ITER test column reported here has a diameter of about 30 mm and a packed length of approx…
The genus Marsdenia R.Br. is circumscribed utilising data from taxonomic history and morphology. and its relationship to other genera in the Marsdenieae is discussed. Genera that have usually been or commonly regarded as distinct. i.e. Gymnenla R.Br., Leichardtia R.Br., Bidaria (Endl.) Decne. and Thozetia F . Muell .…
In case of a shielding analysis of the geometry having thick and complicated structures with a Monte Carlo code, it is a serious problem that it takes too much computer time to obtain results with good statistics. Therefore, it is very important to reduce variances in the calculation. In this study, a method to determ…
Since lithium-containing ceramics (e.g. Li2O, LiAlO2, Li4SiO4, Li2ZrO3, Li2TiO3) are considered as breeding materials in the blanket of the next generation fusion reactors, several studies are in progress to evaluate their behaviour under irradiation in both operating and accidental conditions.Based on safety and econ…
In order to develop a method to detect low-level oxygen in thin silicon crystals by photoluminescence (PL), a radiative carbon–oxygen center (C center: 0.79 eV) is formed in silicon crystals through carbon introduction by ion implantation. The PL intensity of the C center of the implanted sample is significantly incre…
The chemistry of the rechargeable system Li / LiAlCl 4 · x SO 2 / C (where x = 2.8 to 6 ), which has an open‐circuit voltage of 3.2 V, was investigated and compared with that of Li / LiGaCl 4 · x SO 2 / C , which has an open‐circuit voltage of 2.9 V. Cyclic voltammetry, pressure measurements, elemental analysis, and v…
Other| October 01, 1995 On the thermodynamic data of kaolinite Aley El-Din K. El-Shazly Aley El-Din K. El-Shazly Sultan Qaboos University, Department of Earth Sciences, Al-Khod, Oman Search for other works by this author on: GSW Google Scholar American Mineralogist (1995) 80 (9-10): 1048–1053. https://doi.org/10.2138/…