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。
In Sm2+X compounds (X = S, Se, Te) an unusualy large dependence of the low-temperature Van Vleck susceptibility on the ligand has been observed. SmSe, SmTe, and also TmTe undergo a continuous insulator-metal transition under pressure. In contrast, SmS shows a discontinuous transition to the metal at 6.5 kbar. In all c…
The high-temperature heat contents of high-purity YF3, LaF3, PrF3, NdF3, GdF3, HoF3, and LuF3 were measured from 100–1600°C. The heat capacity, heats of transition, heats of fusion, and related thermodynamic functions were calculated. The smoothed values of H°T − H°298, Cp, S°T − S°298, and − (F°T − H°298) / T are tab…
Ferroelectric K(6−x−y)Li(4+x)Nb(10+y)O30, with x ≃ 0.07, y ≃ 0.23, and a Curie temperature of 613°K, crystallizes with a tungsten bronze-type structure in the tetragonal system. The lattice constants are a = 12.5764 ± 0.0002 and c = 4.0149 ± 0.0001 Å at 298°K. The space group is P4bm. There is one formula per unit cel…
Excitation of electrons between parallel or near-parallel one-electron bands in simple polyvalent metals constitutes a major source of the observed optical absorption. Much of the effect can be accounted for in a straightforward calculation of both real and imaginary parts of the conductivity, which does not require t…
Raman scattering has been studied in the amorphous form of Si and several related, tetrahedrally bonded semiconductors (Ge, GaAs, GaP, InSb). All vibrational modes of the material can take part in the scattering process, and the Raman spectrum is a measure of the density of vibrational states. The amorphous phases are…
Rapid crystallization and equally rapid revitrification of amorphous chalcogenide films exposed to short laser pulses has been observed. A model is developed in which both the speed of crystallization and the reversibility are attributed to the large enhancement of crystallization rate under the influence of the photo…
Abstract The saturation magnetizations of very pure iron and nickel have been measured absolutely by a force method at room temperature. The values are 217.6 and 55.1 emu/g (217.6 and 55.1 J T-1 kg-1) respectively. The theory and reliability of the force method are investigated and discussed. New measurements have als…
To obtain kaolinite at low temperature and pressure from the system Si(OH)(4)-Al(3+)-H(2)O, the sixfold coordination of aluminum is a necessary prerequisite. Kaolinite was synthesized at pH values from 2 to 9 and with a ratio of SiO(2) to Al(2)O(3) in solution from 1 to 10 by means of the complexation of Al(3+) and fu…
In ferrimagnets, under a dc magnetic field, magnon-phonon coupling can result in such effects as acoustic birefringence and Faraday rotation. From our work on acoustic Faraday rotation in nonellipsoidal samples of YIG, we found three regions of rotation. The low field region has an internal magnetic field insufficient…
Abstract A series of new light‐sensitive polysulfonate copolymers have been prepared by the interfacial polycondensation of mixed bisphenols and aromatic disulfonyl chlorides. The light‐sensitivity bisphenols contain the styryl ketone group. These polymers exhibit good light sensitivity, and upon exposure to light the…
view Abstract Citations (42) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS On the Photoionization of Hydrogen and Helium Brown, Robert L. Abstract The total cross-section for the photoionization of helium including transitions to doubly excited (bound-free and free-free) s…
Abstract Ideally, materials from which splints, braces, casts, and other orthopedic appliances are to be made should be capable of being shaped directly against the patient. They should be simple and quick to use, and require the minimum of special equipment. Appliances made from them should be dimensionally stable in…
The ionization of tyrosine residues in human lysozyme was investigated by measurement of spectral changes at pH values between 8.74 and 12.75. Below pH 11.70, at ionic strength 0.10, the titration curve is fully reversible. An average of 4 tyrosine eq per mole are ionized at this pH. At pH values higher than 11.70, th…
Viskositätsmessungen nach dem Rotationsverfahren an Reineisenschmelzen, Eisen‐Kohlenstoff‐Legisrungen mit 0,16 bis 4,30% C sowie an Eisen‐Nickel‐Legierungen mit 2 bis 35% Ni im Bereich von den IÄquidustemperaturen bis 1700 °C. Aussagen über das Newtonsche Fließverhalten der untersuchten Legierungen. Angabe der Aktivie…
Abstract Information about the order‐disorder transition of NaNO 2 is obtained from the temperature dependence of the optical nonlinear susceptibility χ (2) . The decrease of χ (2) ( T ) in the ferroelectric phase can be related to increasing rotational motion of the NO ‐ions. While χ (2) indicates the degree of order…
The stresses of infinite edge dislocation multipoles are investigated with the aid of a B5500 computer, and contour maps are obtained using the line printer. These multipoles consist of infinitely long, parallel edge dislocations of same strength, arranged so as to define a prism whose cross section is a regular polyg…
Abstract The theory is presented for the electronic band structure of the dichalcogenide layer‐type crystal MoS 2 in its 2H form. Group theory is used to treat an LCAO model based on s, p, d Mo atomic states, and s, p S atomic states. Hybridised spin‐orbit bands are examined along the Δ‐axis, and at the M‐ and K‐point…
The fission cross section of 235U has been measured with a nominal resolution of 1 nsec/m from 20 eV to 100 keV. Structure is seen over the entire range with fluctuations as great as 40% in the range 10 to 100 keV. These measurements have an average absolute accuracy of 8% and are based upon the 6Li(n, α) cross sectio…
Maximally flat (MF) low-pass filters with multiple pairs of coincident or distinct imaginary axis zeros are investigated and compared with the all pole Butterworth filters. It is shown that for the same ordern, finite zero filters provide much sharper cutoff than Butterworth filters, and that the cutoff slope increase…
The transmission of normally incident electrons through aluminum, which has been vacuum deposited on a 75-Å aluminum oxide insulator has been measured for electrons of energy between 1 eV and 4 keV. Currents to the top layer (65 to 525 Å) and to the metallic bottom layer underlying the insulator were monitored with op…