Materials Literature
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。
Abstract Bright apple green millimeter-sized crystals of tavorite from the Tip Top pegmatite, near Custer, South Dakota are triclinic, space group , with refined unit-cell parameters a = 5.340(2), b = 7.283(2), c = 5.110(2)Å, α = 109.29(2)°, β = 97.86(3)°, γ = 106.32(3)°, V = 174.1(3)Å 3 , a:b:c = 0.7332:1:0.7016, Z =…
The structure of rhombohedral PbZr0.75Ti0.25O3 has been refined at liquid nitrogen and room temperatures (low temperature form) and at 105°C (high temperature form) using neutron diffraction data. Rotations of oxygen octahedra, characteristic for the low temperature phase, amount to ±5.3 and ±3.2 degrees for the forme…
In relation to the temperature effect in cavitation damage, the collapse of a single bubble in water over a wide range of temperatures was experimentally studied. A spark-induced bubble was observed by using a high speed camera and the impulsive pressure caused by the bubble collapse was measured by means of a pressur…
The rhombohedral R -phase appearance in NiTi alloys can be induced by thermal cycling between martensite ( M ) and parent phase ( P ). This procedure has here been followed to separate P-R and R-M transformations. Differential Scanning Calorimetry has been used to detect transformation temperature onset and the enthal…
The model of a KDP-type ferroelectric, in which heterophase fluctuations can occur, is considered. Stability conditions of such states are found. The influence of heterophase fluctuations on thermodynamic characteristics, especially in the critical region, is investigated. It is shown that for some correlation between…
The static Debye-Waller factor and its dependence on the crystal perfection have been obtained through the detailed analysis of the intensity distribution in X-ray diffraction topograph for heat-treated Cz-silicon crystals. The size and density of oxygen precipitates have been determined using the experimental and cal…
Patterned aluminum films are used as conductors for integrated circuits. Unless encapsulated in plastic for protection, these films are easily corroded by moisture, which can result in device failure. In humid environments, this may not fully protect the aluminum, and a means to provide, at low cost, additional protec…
A robotic work station has been constructed for automatically initiating and monitoring microscale chemical reactions. The work station consists of a robot with a general-purpose arm and interchangeable special-purpose hands, a carousel of seven reaction vessels, a series of stations for performing quantitative automa…
Abstract X-ray powder data and crystal data for acetaminophen, C 8 H 9 NO 2 , are reported and results are compared to existing PDF patterns.
Abstract A quantum chemical calculation of bonding parameters in Sb 2 Te 3 , Bi 2 Te 3 , Bi 2− x In x Te 3 , and Bi 2 Te 3− x S x single crystals is carried out. The electric conductivity σ ⟂ c and Hall constant R H ( B ∥︁ c ) of the crystals in the Bi 2 Te s− x S x system are measured. These results present a basis f…
Abstract Die Härtung von diolmodifizierten Epoxidharzen wurde mittels longitudinaler Ultraschallgeschwindigkeits‐ und Dämpfungsmessungen verfolgt. Aus der Zeitabhängigkeit der akustischen Parameter können der Gelpunkt, der dynamische Glasübergang und das Ende der Vernetzungsreaktion für verschiedene Harze bestimmt wer…
The use of high-temperature solid oxide fuel cell (SOFC) systems is discussed. Such cells show great promise for economical production of electricity and heat in a variety of commercial, industrial cogeneration, and electric utility systems applications. Pioneered by Westinghouse in the 1960s, this technology is based…
As part of a study of interactions between metallocenes, held so that two cyclopentadienyl rings are constrained to be proximate and facing one another, 1,8-diruthenocenylnaphthalene (1b) has been prepared and its crystal structure has been determined. This structure is shown to be close to that of 1,8-diferrocenylnap…
A strategy for the determination of crystal structures with large known fragments directly from measured X-ray powder diffraction intensities is presented. It is based on the automated full-symmetry Patterson search method described by Rius & Miravitlles [J. Appl. Cryst. (1987). 20, 261–269] where the Fourier coeffici…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFull configuration interaction benchmark calculations for titanium monohydrideCharles W. Bauschlicher Jr.Cite this: J. Phys. Chem. 1988, 92, 11, 3020–3023Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Published inissue 1 June 1988https://p…
A test method that uses a capacitive field probe to investigate the space charge distribution in low-density polyethylene (LDPE) is described. Specimens of 7-mm thickness were stressed under 100 kV DC at room temperature and for different time periods. The results indicate that the LDPE insulation layer between electr…
A seeded crystal growth technique has been used to study the influence of solution pH and temperature ranging from 25 to 50 °C on the performance of polymers of varying functional groups as calcium sulfate dihydrate (CaSO 4• 2H 2 O, gypsum) crystal growth inhibitors. Results indicate that at constant temperature and a…
Melting temperature of UO2 and UO2-2w/oGd2O3 fuels irradiated in a commercial LWR were determined by a thermal arrest technique in a burnup range up to approximately 30GWd/tU. No decrease in the melting temperature was observed on both UO2 and UO2-2w/oGd2O3 fuels with increment of burnup to 30GWd/tU. It was also found…
Point defects exert an important influence on the physical properties of crystals. The presence of defects may cause colouration of crystals and increase in their electric conductivity making technical application of these crystals difficult or even impossible. In this paper several possibilities of point defects form…
A summary of all the accurate (-0.1%) low-angle X-ray atomic scattering (form) factors for cubic and hexagonal close-packed elements which have been determined by the critical voltage technique in high energy electron diffraction (HEED) is presented. For low atomic number elements (Z ~ 40) the low-angle form factors c…