Properties of NH4HSO4 and RbHSO4 single crystals near their curie points
The accurate measurements of the properties of NH4HSO4 and RbHSO4 were carried out. A statistical theory of the ferroelectric transitions is proposed.
Materials Literature
文献浏览
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Resonance Raman spectra of some mixed-valence halogeno-compounds of antimony and lead
Resonance-Raman (r.r.) spectra are reported for a series of mixed-valence compounds of antimony. With Cs2[SbCl6]· Rb2[SbCl6], or Cs4[SbBiCl12], several overtone and combination tone progressions, in which the progressing fundamental is ν1(a1g) of the [SbCl6]– ion, have been observed on irradiation within the contour o…
Mercury( II )-ethylenediamine complexes. Crystal and molecular structure of bis(ethylenediamine)mercury( II ) diperchlorate and dithiocyanato(ethylenediamine)mercury( II )
Crystals of bis(ethylenediamine)mercury(II) diperchlorate, (I), are monoclinic, a= 7.754(6), b= 11.618(7), c= 7.754(6)Å, β= 100.38(3)°, space group P21, Z= 2. In the complex cation the mercury ion is co-ordinated by four nitrogen atoms (Hg–N 2.30–2.33 Å) in a distorted tetrahedron (N–Hg–N ring angles 77.2 and 78.5°).…
Phase Identification by X-Ray Powder Diffraction Evaluation of Various Techniques
Three powder mixtures, each composed of four or more phases, were submitted for phase identification by x-ray diffraction. Laboratory technicians supplied tables of “d” values and of relative intensities as obtained separately and independently by use of the diffractometer, the Debye camera and the Guinier camera. The…
Dynamic Strain-Aging and Neutron Irradiation in Mild Steel
“Blue brittle” or dynamic strain-aging studies were carried out on mild steel in vacuum-annealed, irradiated, and irradiated decarburized conditions. The effect of neutron damage is to decrease or eliminate the concentration of free interstitial impurity elements responsible for locking the dislocations. Progressively…
Current and Potential Uses of Starch Products in Plastics
Although numerous developments have been reported on how starch can be used to make plastics, these have failed to achieve large-scale market reality, largely because better and lower cost plastics can be made from other raw materials, particularly petroleum. Decreasing availability and increasing prices of convention…
Band structure, optical and transport properties of KTaO3, KNbO3and BaTiO3in the paraelectric phase
The electronic structure of ABO3 cubic perovskite-type oxides are determined by a modified tight-binding method. The imaginary part of the dielectric constant ε2 and the moments of ε2 provide a quantitative interpretation of optical data. Constant energy surfaces near the conduction band minimum are warped spheres. Th…
Rigid polyurethane foams from diethanolamides of carboxylated oils and fatty acids
Abstract New polyols of high hydroxyl content and reactivity were made from linseed and soybean oils and acids by catalytic carboxylation followed by reaction with diethanolamine. Urethane foams made with these diethanolamides were stronger than those made with castor oil at equivalent polyol wt. Because of their high…
Biochemical Studies on an Extreme Thermophile Thermus thermophilus: Thermal Stabilities of Cell Constituents and a Bacteriophage
Mechanism of thermophily has been the object of biochemical interest for many years, but has not been clearly answered at the molecular level. Most of the studies have been done using a moderate thermophile, Bacillus stearothermophilus which grows optimally at 60–65°C. Studies on more rigorously thermophilic bacterium…
Metallurgical considerations in the production and use of FeTi alloys for hydrogen storage
Hydriding alloys based on the intermetallic compound FeTi have potential for the safe and convenient storage of hydrogen, both for mobile and stationary applications. Optimum technical and economic use of these alloys requires an understanding of the physical metallurgy of the system and its relation to the hydriding…
Plinthite Characterization in Selected Southern Coastal Plain Soils
Abstract Samples of plinthic horizons from five soil series were collected in the Southern Coastal Plains Province of Georgia. Plinthite and various colors of soil material in each horizon were separated and analyzed for particle size distribution, Fe 2 O 3 content, and mineralogy. Iron segregation is greater in plint…
Einfluß der Verarbeitungsbedingungen auf die Kristallinität und Gefügestruktur teilkristalliner Spritzgußteile
Thermoplastische Spritzgußteile weisen eine außerordentlich starke Inhomogenität und Anisotropie der Formteileigenschaften auf. Die Inhomogenität ist über dem Formteilquerschnitt wesentlich stärker ausgeprägt als längs des Fließwegs. Die Verarbeitungsbedingungen beeinflussen die innere Struktur erheblich. Daher ist es…
Properties and Structure of Glasses in the Systems SiO<sub>2</sub>-PO<sub>5/2</sub> and GeO<sub>2</sub>-PO<sub>5/2</sub>
The binary glasses were prepared in the SiO2-PO5/2 system containing 0-64.2 and 95.7-100mol% PO5/2, and in the GeO2-PO5/2 system containing 0-48.8mol/ PO5/2.In the binary SiO2-PO5/2 glasses the transformation temperature (Tg) and the Vickers microhardness (Hv) decreased sharply up to about 30mol% PO5/2 because of intr…
Vapor Deposited Silanes and other Coupling Agents
Coupling agents are primarily used to: (a) promote adhesion between the adherends and adherates1 or reinforcing media in the case of composites; (b) maintain improved adhesion as a function of aging; and (c) protect against the deleterious effects of water and corrosive environments. Silanes are the most commonly used…
Effects of Titanium upon Magnetic Anisotropy and Coercivity in Alnico Magnet Alloys
The anisotropy measurement combined with magnetic measurement and electron microscopy is performed on monocrystalline Alnico alloys with various contents of Ti and Co, to examine the effects of these constituents, especially of Ti, upon the high coercivity in Alnico alloys. The shape anisotropy constant, Ku* increases…
The Role of Hydrogen in the Fracture of Iron and Steel
The behaviour of interstitial atoms of light elements in the iron lattice are discussed and classified, particularly in regard to their influence on the bonding nature of the iron lattice and their tendency of formation of platelet clusters. According to this general consideration the stress induced clustering of hydr…
Determination of Nematic Liquid Crystal Elastic and Dielectric Constants from Birefringence Experiments
A non-linear least squares technique was used to determine k 11, k 33, ε1 and ε2 by comparing data from a single birefringence vs. voltage experiment. Liquid crystal optical cells with parallel orientation were used to generate the birefringence-voltage curve from which the parameters were determined. Cell thickness w…
A phenomenological model for row nucleation in polymers
A topic of intense interest to polymer morphologists in the past few years is the phenomenon variously called row nucleation or oriented crystallization (from a stressed melt) and shish-kebab crystallization (from stirred solutions) [1–4]. The phenomenon can be characterized as the formation of a fibrillike nucleus, p…
Cyclic Oligomers in the Cationic Polymerization of Heterocycles
Abstract—The cationic polymerization of heterocyclic monomers may lead to polymers containing substantial, yet Variable amounts of cyclic oligomers. This review gives a survey of the systems where such oligomers have been found. Oligomer formation is generally observed in the polymerization of oxiranes and thiiranes.…
THE DIATOMS OF TIMPANOGOS CAVE NATIONAL MONUMENT, UTAH
The diatom flora of the cavern system of Timpanogos Cave National Monument was investigated. Diatoms were found throughout the cave system and were distributed according to moisture and natural openings. Twenty‐six species were identified and described, including eight not previously collected from caves and four new…