Materials Literature
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By assuming that diffusion of the dopant molecules in argon gas within the crucible is the limiting step of the evaporation, a model for dopant concentration in Czochralski silicon melt is derived. The dopant concentration in the melt during crystal growth can be expressed as where is an evaporation parameter defined…
Epitaxial Ga 2 Se 3 films were grown by molecular beam epitaxy on GaP substrates. The photoinduced oxidation of epitaxial Ga 2 Se 3 was observed using Ar + laser irradiation. Furthermore, it was suggested from the Auger analysis that the crystal structure of oxidized material was Ga 2 O 3 . The transparency of Ga 2 Se…
Abstract Intensities of the OD stretching modes in the Raman spectra of LiX solutions (X = Cl, Br and I) in CH 3 OD were measured. It is shown that the intensities increase significantly with increasing halide concentration owing to a pre‐resonance Raman effect arising from charge‐transfer states of hydrogen bonds bet…
XPS spectra were recorded for the InAs(110) surface. For comparison, data were acquired for a sample cleaved in situ (Accession #00107) and for a sample exposed to air for 60 min (Accession #00108). The electronic record includes the In 4d, As 3d, In 3d, As LNN, In MNN, and the valence band region.
Brachytherapy for ocular melanoma uses 125I seeds backed by a gold shield. Conflicting results are reported in the literature on the effect of the gold on dose close to the seeds. In this work, a small lucite jig was constructed such that the seed-to-detector separation remained fixed as high-Z materials of lead, silv…
${\mathrm{MgF}}_{2}$ crystals have been implanted with 100-keV metallic ions (sodium, magnesium, aluminum) and rare-gas ions (neon, argon, krypton, xenon). Dose levels were in the range (6--100)\ifmmode\times\else\texttimes\fi{}${10}^{15}$ ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}2}$. The nature and thermal stability of…
The State Institute for the Nitrogen Industry is one of the oldest industrial branches of the research and engineering institutes in Russia and the former U.S.S.R., and in 1991 the Institute celebrated its sixtieth anniversary. This paper gives a brief overview of the main results of work carried out by GIAP alone and…
Abstract The measurements of dielectric properties of collagen BAT in the solid state were made over a frequency of the electric field range of 10 Hz to 10 kHz and at temperatures from 298 to 503 K. The temperature dependence of the dielectric constant ε and the dielectric loss factor ε″ of collagen show that thermal…
Article Crystal structure and twinning of KCd4Ga5S12 and some isotypic AB4C5X12 compounds was published on July 1, 1993 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 204, issue 1-2).
Abstract Das quasibinäre System LiGaSn enthält die intermediären ternären Phasen Li 7 Ga 7 Sn 3 , Li 2 Ga 2 Sn, Li 5 Ga 5 Sn 3 , Li 3 Ga 3 Sn 2 und LiGaSn. Einkristalle von LiGaSn (a = 632,9(4) pm, Fd3m, Z = 4), Li 3 Ga 3 Sn 2 (a = 445,4(3), c = 1 090,0(2) pm, hP*), Li 5 Ga 5 Sn 3 (a = 447,0(4), c = 4 220,0(9) pm, hP…
The beta- and delta-subunits of the nicotinic acetylcholine receptor from Torpedo californica were covalently photolabeled at the synaptic surface with the ATP photoaffinity analogue [alpha-32P]-8-azido-ATP. The specificity of labeling for nucleotide binding sites was demonstrated by the saturation of labeling with in…
GaAs:C and AlxGa1−xAs:C films, grown by solid-source molecular-beam epitaxy with doping levels beyond 1019 cm−3, have been studied by high-resolution double-crystal x-ray diffraction, Hall-effect measurements, and secondary-ion-mass spectroscopy (SIMS). Comparison between x-ray diffraction and Hall-effect data indicat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrientation-dependent interactions in polymer systems. 3. Segmental orientation in poly(2,6-dimethyl-1,4-phenylene oxide)/polystyrene miscible blendsKenji Kawabata, Takeshi Fukuda, Yoshinobu Tsujii, and Takeaki MiyamotoCite this: Macromolecules 1993, 26, 15, 3980–3985Publica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-liquid phase equilibria of mixtures of methyl myristate and methyl palmitateChristian A. Lockemann and Ernst Ulrich SchluenderCite this: J. Chem. Eng. Data 1993, 38, 3, 432–433Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published…
Abstract A series of side‐chain liquid crystalline polymers (side‐chain LCPs) with different flexible spacer lengths and various degrees of crosslinking were synthesized and characterized. The transport properties of O 2 , N 2 , CO 2 and CH 4 in these polymers were measured by using permeation and sorption methods. Th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA low-temperature route to polyimidesJi Heung Kim and J. A. MooreCite this: Macromolecules 1993, 26, 14, 3510–3513Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue 1 July 1993https://pubs.acs.org/doi/10.1021/ma00066a008https…
XPS spectra were acquired for highly ordered pyrolytic graphite, a single crystal diamond, and a C60 film. Carbon 1s and valence band spectra are included in the electronic record.
Abstract The residual birefringence distributions in polycarbonate disks quenched in a liquid bath under various conditions are determined. Unbalanced distributions of approximately parabolic shape are obtained in the cross‐sections in general. A systematic influence of the initial quench temperature on the imblance o…
The reaction of NH4F/HF solutions on Si (100) and Si (111) surfaces was investigated by means of x-ray photoelectron spectroscopy and high-resolution electron energy loss spectroscopy (HREELS). The pH of the HF treatment was varied in the range from pH 1 to pH 8. Exactly oriented Si (111) surfaces show an overall smoo…
Kerr measurements are reported for a cyclic trimeric liquid crystal above the uniaxial nematic-isotropic phase transition temperature ${\mathit{T}}_{\mathit{N}\mathit{I}}$. The inverse of the order-parameter susceptibility is found to be linear in temperature, such that the quantity ${\mathit{T}}_{\mathit{N}\mathit{I}…