Showing papers on "Antimony published in 1970"

Studies on sintered photoconductive layers of antimony trisulphide

Abstract: Antimony trisulphide was sintered on to glass blanks and their electrical and photoconductive properties such as spectral distribution of photoconductivity, current-voltage characteristics and lux-ampere relationship are presented.

Fluoride crystal structures. Part XIV. Antimony trifluoride: a redetermination

Abstract: Crystals of antimony trifluoride are orthorhombic, space group C2cm, a= 4·95, b= 7·46, c= 7·26 A, as previously reported. The structure was refined by three-dimensional least-squares methods, to R 0·072 for 370 reflections. Each antimony atom has three close fluorine neighbours with mean Sb–F distances 1·92 A. These SbF3 units are then linked through three fluorine bridges (Sb⋯F 2·61 A) to form a three-dimensional network, with a much distorted octahedral co-ordination around the antimony atom.

Anomalous Diffusion of Phosphorus into Silicon

Abstract: Lattice strains induced by diffusion of phosphorus, arsenic, antimony and tin into silicon are studied through an X-ray double crystal spectrometer. This quantitative experiment gives that the amount of lattice strain induced by diffusion of impurity depends both on the size of impurity atoms diffused into silicon and on the impurity concentration, which agrees with the equation by S. Prussin et al. It also leads to the result as follows; the lattice strain in the diffused layer is compensated in the case of the phosphorus content less than 4×1020 atoms/cm3 by diffusing both tin, whose atomic radius is larger than that of silicon, and phosphorus with smaller radius. Anomaly in the diffraction pattern is also observed in the case of anomalous diffusion of phosphorus under high vapor pressure of phosphorus.

Mass-spectrometric study of the laser-induced vaporization of compounds of arsenic and antimony with the elements of group VIA

Abstract: The laser mass spectrometer has been used to study the vapor composition of various compounds of arsenic and antimony with the elements of Group VIa. It is shown that in some cases there is a direct correlation between the vapor composition and the structure of the condensed phase. The mechanism of the laser‐induced vaporization is discussed; it is shown that the critical region (or vicinity) can be reached in laser–solid interactions.

A study of diffused layers of arsenic and antimony in silicon using the ion‐scattering technique

Abstract: By bombarding samples with 1.1‐MeV 4He+ ions and observing the energy spectra of the backscattered ions, it has been possible to determine the concentrations and lattice locations of arsenic and antimony impurities diffused into silicon. For the samples investigated it was found that only 60–75% of the arsenic atoms were in substitutional sites, even at impurity concentrations well below solid solubility. About 90% of the antimony atoms were found to be in substitutional sites.

Characterization of Mixed Uranium Antimony Oxides USbO5 and USb3O10

Abstract: The system U-Sb-O was examined in air up to 1000°C for ternary compounds. The products were characterized by chemical analysis, density determinations, TGA, X-ray diffraction techniques, and magnetic measurements. The ternary compounds found were USbO5 and USb3O10. All cations are pentavalent in these new compounds, which are crystallographically related to α-UO3 and U3O8.

Yttrium-antimony alloy system☆

Abstract: A phase diagram is proposed for the yttrium-antimony system based on thermal, microscopic, chemical and X-ray analyses. An inverted peritectic reaction develops as a result of antimony additions, lowering the 1475° C transformation temperature of yttrium to 1462° C. Eutectic reactions occur at 14.5 at. % antimony and 1220° C, and greater than 99.0 at.% antimony and 629° C. There are four compounds in the system. The compound YSb melts congruently at 2310° C while Y 3 Sb and Y 5 Sb 3 result from peritectic reactions at 1240° and 1690° C. The fourth compound, Y 4 Sb 3 , forms peritectically at 2120° C, but decomposes by a eutectoid reaction at 1660° C.

Die Komplexbildungstendenz des dreiwertigen Antimons in wässeriger Lösung

Abstract: The formation of the complexes of trivalent antimony ion with the following ligands has been investigated with pH measurements: D-tartaric acid, L-tartaric acid, catechol, catechol-3,5-disulfonic acid, 2,3-dihydroxybenzoic acid, mercaptoacetic acid, rac-thiomalic acid, meso-, rac-dithiotartaric acid, and mercapto-ethanol. Using the determined equilibrium constants, a classification of the ligands with respect to their ability to sequester the cation studied is given. In a discussion in which data of the literature are also included the structure of the tartar emetic, the possibility of a volumetric determination of the antimony, some problems concerning the coordination number, and the structure of the complexes are examined.

Infrared Spectra of Matrix‐Isolated Antimony and Arsenic Pentafluorides

Abstract: The infrared spectra of SbF5 and AsF5 suspended in argon and neon matrices have been recorded between 4000 and 100 cm−1. The spectra of SbF5 and AsF5 are radically different and show that monomeric SbF5 belongs to symmetry group C4υ rather than to group D3h. The spectral effects induced by forming solid SbF5 from the monomers are understood in terms of associations through Sb–F–Sb fluorine bridge bonds. The behavior is compared with that observed previously for SF4. No evidence for fluorine bridging occurs with AsF5.

High-temperature gas-phase laser Raman spectroscopy: evidence for the existence and molecular structure of the interpnictides As3P, As2P2, and AsP3 in mixtures of phosphorus and arsenic vapours and SbP3 in mixtures of phosphorus and antimony vapours

Abstract: The gas-phase laser Raman spectra of phosphorus and arsenic mixed vapours and phosphorus and antimony mixed vapours are investigated as a function of composition and temperature up to 1000 °C. The data are consistent with the presence of the tetratomic molecules PnAs4–n where n= 0–4. Under our experimental conditions SbP3 is probably the main (mixed) constituent in phosphorus–antimony mixed vapours. The polarization and relative intensity data together with the computed frequencies for As3P, AsP3, and SbP3 proved useful in the assignment of bands to the different molecular species.

Enhanced Diffusion of High-Temperature Ion-Implanted Antimony Into Silicon

Abstract: Concentration profiles of 20‐keV high‐temperature ion‐implanted antimony into a silicon single crystal were measured by means of radioactivation analysis and the enhanced diffusion was observed. The concentration profiles were found to be independent of temperature over the range between 500 °C and 800 °C and to be dependent on the dose rate of ion implantation. The diffusion coefficient of antimony is estimated to be about 1.1×10−15 cm2/sec for the dose rate of about 1.2×1012 ions/cm2 sec and about 6.6×10−15 cm2/sec for that of about 7.2×1012 ions/cm2 sec. The measured concentration profiles are in good agreement with the calculated concentration profile. These results are explained on the basis of a vacancy mechanism.

Komplexone XLIII. Die Komplexe des dreiwertigen Antimons mit Polyaminocarboxylaten

Abstract: If a strong base is added to solutions containing complexes of trivalent antimony with aminopolycarboxylates, these ligands are displaced, and oversaturated solutions of antimony (III) hydroxide are formed. This reaction has been used to investigate the formation of complexes of SbIII with the following ligands: N′-hydroxyethyl-ethylenediamine-N,N,N′-triacetate ion, ethylenediamine-N,N,N′,N′-tetraacetate ion, 1,2-diaminocyclohexane-N,N,N′,N′-tetraacetate ion, and diethylenetriamine-N,N,N′,N″,N″-pentaacetate ion.

The non-existence of Sb2S5: a Mössbauer spectroscopic investigation of some antimony chalcogenides and oxides

Abstract: 121 Sb Mossbauer spectroscopy has been used to study some antimony chalcogenides: no evidence could be found to support the existence of Sb2S5.

Flame retardant antimony compositions

Abstract: SOLUTIONS OF PENTAVALENT ANTIMONY-ALPHA-HYDROXY CARBOXYLIX ACID COMPOUNDS OR OF HYDROUS PENTAVALENT ANTIMONY SOLS STABILIZED WITH AN ALPH-HYDROXY CARBOXYLIC ACID IN POLAR ORGANIC SOLVENTS SUITABLE FOR SPINNING OR CASTING ORGANIC POLYMERS ARE USEFUL FOR DISPERSING FLAME-RETARDING PENTAVALENT ANTIMONY COMPOUNDS IN POLYMERIC STRUCTURES.

PROCESS FOR PREPARING LITHIUM COMPOUNDS OF THE FORMULA LiMF{11 {0 WHEREIN M IS ARSENIC OR ANTIMONY

Abstract: Lithium compounds of the formula LiMF6 wherein M is arsenic or antimony are prepared by a metathesis reaction in an inert organic solvent between lithium tetrafluoroborate and an alkali metal compound of the formula ZMF6, wherein Z is potassium or sodium and M is as defined above.