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。
Infrared spectra of metal-free phthalocyanine, chlorinated and unchlorinated copper phthalocyanines, and three new metal derivatives of phthalocyanine: MoPc, Na 2 Pc, and AlOH—Pc (Pc = C 32 H 16 N 8 ), have been recorded. Assignments have been suggested for many of the peaks in the infrared spectra of the phthalocyani…
The Kubo expression for lattice thermal conductivity is analyzed by the method of the double-time Green's function. The usual relaxation-time formula of kinetic theory can be obtained from the Kubo formula by suitable approximations only.
For the hopping motion of polaron holes the frequency factor ${W}_{0}$ of the transition probability is determined by the observation that hole localization occurs in a molecular orbital of the irreducible set ${t}_{2g}$ of a cation site group (with transfer integral ${b}_{\ensuremath{\pi}}$), whereas the superexchang…
The transmission and reflectance of cuprous oxide has been measured from 6 to 250 \ensuremath{\mu} and analyzed by classical dispersion theory. The two infrared-active vibrational frequencies are given by ${\ensuremath{\nu}}_{1}=613$ ${\mathrm{cm}}^{\ensuremath{-}1}$ and ${\ensuremath{\nu}}_{2}=146.0$ ${\mathrm{cm}}^{…
Emission of light by crystals mechanically deformed at room temperature after $\ensuremath{\gamma}$ irradiation at 35\ifmmode^\circ\else\textdegree\fi{}C has been studied. Spectra of several alkali halides were measured, and the intensity of the luminescence investigated in relation to $\ensuremath{\gamma}$ dose, stra…
The thermal conductivities of AlSb apd GaSb have been measured between 300 and 950\ifmmode^\circ\else\textdegree\fi{}K, and of GaP between 300 and 550\ifmmode^\circ\else\textdegree\fi{}K, on $n$-type samples of about ${10}^{18}$ ${\mathrm{cm}}^{\ensuremath{-}3}$ using the diffusivity technique. The room temperature th…
X-ray studies of mica specimens from a variety of geological localities show that biotite and certain lithium-rich mica samples are composed of a mixture of different polytypes. Many of the biotite structures are new complex polytypes not before reported. A new method of designating mica polytypes is proposed. Techniq…
The superconducting transition temperature of stoichiometric ${\mathrm{La}}_{3}$${\mathrm{S}}_{4}$ has been measured by two different methods and has been found to be (8.25\ifmmode\pm\else\textpm\fi{}0.2)\ifmmode^\circ\else\textdegree\fi{}K. A range of superconducting compositions exists in the metal-rich end of the $…
We report measurements of the spin-lattice relaxation rate ${{T}_{1}}^{\ensuremath{-}1}$ for several magnetically dilute rare-earth ions in the temperature range $1.2\ifmmode^\circ\else\textdegree\fi{}\ensuremath{\leqq}T\ensuremath{\leqq}5\ifmmode^\circ\else\textdegree\fi{}$K, using the transient recovery of the micro…
Abstract Niobpentoxid kristallisiert in zahlreichen Modifikationen. Die Arbeit bringt einen Überblick, insbesondere über die Bildungsweisen, die Strukturen und das thermische Verhalten.
A new tungsten boride has been prepared and has been assigned the formula WB(2). The assignment is based on comparison of the x-ray diffraction data of this boride with those of diborides of the AlB(2) type structure. Values of a(0) = 3.02 and c(0) = 3.05 were calculated for a hexagonal unit cell.
Averbuch-Pouchot Marie-Thérèse, Tordjman Isaac, Durif-Varambon André. Données cristallographiques sur trois nouveaux trimétaphosphates de type benitoïte : (PO3)3 Cd MI (MI = Ag, Tl et Rb). In: Bulletin de la Société française de Minéralogie et de Cristallographie, volume 89, 3, 1966. pp. 405-406.
J. N. Bradley, Chem. Commun. (London), 1966, 175 DOI: 10.1039/C19660000175
Changes in dislocation arrangement and twin faults formation by quenching and tempering of a Ti-9% Ta alloy were investigated by means of internal friction measurements and transmission electron microscopy. It has been found that typical needle-like martensite structures were produced by quenching from the β region, a…
Durif-Varambon André, Grenier Jean-Claude, Averbuch-Pouchot Marie-Thérèse, Tranqui Duc. Forme rhomboédrique des métaphosphates du type (PO3)3MIIK (MII = Co, Ni, Mg, Zn). In: Bulletin de la Société française de Minéralogie et de Cristallographie, volume 89, 2, 1966. pp. 273-274.
Identification of kaolin minerals by D.T.A., X-ray diffraction, electron microscopy is sometimes unfeasible, mainly as far as low -crystallized forms are concerned. It can be the case with fire-clay, metahalloysite or intermediate forms. Infrared spectroscopy in the OH vibration band and Al-O-H deformation band region…
Depression in the transition temperature of Glauber's salt due to the presence of WO42– and its polyanions have been measured at different pH values. The average degrees of condensation calculated from these measurements indicate the existence of mono-, tri-, and hexa-polytungstates. Polymerisation towards WO3 takes p…
The imjJortance oj inclusions in steel has been velY milch ellljJhasi;:ed, and many investigations have been carried out, but in most cases too 1Ilalry variables have been jJresented to draw wry definite conclusion.
A further study has been made of the curling during growth of thin crystal plates of 2,5-di-t-butyl-1,4-dimethoxybenzene, and this behaviour has been related to the approximate structure of the compound deduced from its optical properties. It is suggested that the curling may be due to differential adsorption of the s…
Absorption spectra of Mn2+ ion in alumino-boro-phosphate, magnesium-aluminoborate and soda-lime-silica glasses were studied within the range, 16000 cm-1 30000 cm-1 Five absorption bands were observed at or around 19200 cm-1 [4Γ4(G)], 23300 cm-1 [4Γ5(G)], 24000 cm-1 [4Γ3,4Γ1 (G)], 28100 cm-1 [4Γ5 (D)] and 29300 cm-1 [4…