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Showing papers on "Antimony published in 1969"


Journal ArticleDOI
TL;DR: In this article, the authors investigated the properties of organo(oxinato)antimony(V) compounds and showed that the stability of the SbN coordinate bond in R4SbOx follows the order of the I-effect of the group R. All the compounds are monomeric in benzene.

51 citations


Journal ArticleDOI
TL;DR: In this article, the system Ag-Sb-S was studied between 600°C and 200°C in evacuated silica glass tubes, and it was proposed that the configuration changes near 300°C, and that at 200°c the equilibrium assemblages correspond to those usually reported for minerals in ores.
Abstract: The system Ag-Sb-S was studied between 600°C and 200°C in evacuated silica glass tubes. Results from lower temperature runs require shifts in the stable tie-line configuration found by Barstad at 400°C. It is proposed that the configuration changes near 300°C, and that at 200°C the equilibrium assemblages correspond to those usually reported for minerals in ores. Most of the minerals of the system were synthesized. In addition, the synthetic phase Ag7SbS6 (antimony analogue of the arsenic mineral billingsleyite) is characterized, and the ease of its synthesis in the composition area bounded by argentite-pyrargyrite-sulfur suggests the probable existence of a mineral of this composition. The relatively common mineral stephanite (Ag5SbS4) was not formed as a synthetic product in the temperature range of this study. Combined DTA and X-ray data show that at 197±5°C stephanite decomposes in the absence of sulfur to form pyrargyrite plus argentite, whereas with excess sulfur the products are Sb-billingsleyite plus pyrargyrite. Pyrostilpnite (Ag3SbS3), the low temperature dimorph of pyrargyrite, is unstable above 192±5°C.

48 citations


Journal ArticleDOI
TL;DR: In this article, the authors synthesize monomeric compounds of the types R2SbCl2Acac, R4SbAcac and Cl4sbCl3Acac.

46 citations


Journal ArticleDOI
TL;DR: In this article, the isomer shifts relative to the 121SnO2 source are − 11.3 mm/sec (Sb2O3), − ǫ 13.8 (Sbr3), + ǔ 2.2 (SabbF5), and − 3.12 (sbCl5).
Abstract: Mossbauer spectra of 121Sb in all the binary antimony halides have been obtained, as well as in cubic Sb2O3. The isomer shifts relative to the 121SnO2 source are − 11.3 mm/sec (Sb2O3), − 13.8 (SbCl3), − 13.9 (SbBr3), − 15.9 (SbI3), − 14.6 (SbF3), + 2.2 (SbF5), and − 3.12 (SbCl5). Quadrupole splittings were obtained for most of the antimony(III) compounds. The linear variation of isomer shift with ligand–metal electronegativity difference for Sb2O3, SbCl3, SbBr3 and SbI3 is interpreted as due to a constant s character in the ligand–metal bonds. The SbF3 does not obey this relationship due to its radically different geometry.

38 citations




Journal ArticleDOI
TL;DR: In this article, the formation of n-type layers with ion-implanted nitrogen or antimony in p-type α-SiC requiring maximum process temperatures of 1400 and 1600°C respectively for only a few minutes.
Abstract: We report here the formation of n‐type layers with ion‐implanted nitrogen or antimony in p‐type α‐SiC requiring maximum process temperatures of 1400 and 1600°C respectively for only a few minutes This is believed to be the first confirmation of donor behavior by antimony in SiC Electrical characteristics of these implanted layers have been evaluated by Hall and sheet resistivity measurements Junction devices formed from the implanted layers have shown excellent forward and reverse characteristics at operating temperatures to 400°C

33 citations


Patent
05 Aug 1969
TL;DR: In this article, the authors present an approach for preparing an atTRITION RESISTANT SOLID CATALyst CONTAINING ATIMONY OXIDE, SUITABLE FOR USE in a FLUIDIZED BED ESSENTIALLY COMPRISING the HEAT TREATMENT of a SLURRY CONTAINing ANTIMONY COMPOUND, A FERRIC COMPOUND and A POLYVALENT METAL COMPOUND.
Abstract: PROCESS FOR PREPARING AN ATTRITION RESISTANT SOLID CATALYST CONTAINING ATIMONY OXIDE, SUITABLE FOR USE IN A FLUIDIZED BED ESSENTIALLY COMPRISING THE HEAT TREATMENT OF A SLURRY CONTAINING AN ANTIMONY COMPOUND, A FERRIC COMPOUND, A POLYVALENT METAL COMPOUND AND A SILICA SOL.

31 citations



Journal ArticleDOI
TL;DR: In this article, some new spirocycles of pentacoordinated antimony are described by means of the temperature-dependent proton-resonance spectra of the antimony penta- organyls (XXXV and (XXXVI) conclusions concerning the dynamic stereochemistry of these derivatives are possible.

25 citations


Journal ArticleDOI
TL;DR: In this article, the authors measured the fractional change in the optical reflectivity of silicon in the 1.8-2.2 eV photon energy band as a function of 40-keV antimony ion dose (1011-1015 Sb/cm2 at various implant temperatures (− 160-405°C).
Abstract: We have measured the fractional change in the optical reflectivity of silicon in the 1.8–2.2 eV photon energy band as a function of 40‐keV antimony ion dose (1011–1015 Sb/cm2 at various implant temperatures (− 160–405°C). Approximate agreement is found between the change of reflectivity and previous measurements of lattice disorder as determined by backscattering of 1‐MeV He ions.

Journal ArticleDOI
TL;DR: In this article, the magnitude of a term occurring in the low-temperature electrical resistivity of bismuth and antimony alloys has been measured and the rate of increase of this term with increasing antimony concentration suggests that it may be associated with electron-electron scattering due to an interaction which is appreciably phonon-mediated (Fr\"ohlich-BCS type).
Abstract: The magnitude of a ${T}^{2}$ term occurring in the low-temperature electrical resistivity of bismuth and bismuth-antimony alloys has been measured. Antimony concentrations were less than 3 at.%. The rate of increase of this term with increasing antimony concentration (decreasing free-carrier concentration) suggests that it may be associated with electron-electron scattering due to an interaction which is appreciably phonon-mediated (Fr\"ohlich-BCS type).

Journal ArticleDOI
TL;DR: The high pressure phase of antimony stable above 85 kbar is superconducting as discussed by the authors, and the transition temperature is 3.55°K at 85kbar, decreasing very slightly with pressure.

Journal ArticleDOI
TL;DR: In this paper, the dithiocarbamato-complexes of iron, cobalt, antimony, and copper are halogenated to a positive ion, presumably with an s-tetrathian ring.
Abstract: Halogenation of dithiocarbamato-complexes of iron, cobalt, antimony, and copper gives compounds in which the dithiocarbamate is oxidised to a positive ion, presumably with an s-tetrathian ring, and the metals are present in halogenated negative ions.

Journal ArticleDOI
TL;DR: In this paper, the results of measurements of the linear thermal expansion of single-crystal rods of pure antimony and bismuth over the temperature range 200 °K to 8 °K, and 200°K to 45°K respectively, made using an optical lever dilatometer, are discussed.
Abstract: Results of measurements of the linear thermal expansion of single-crystal rods of pure antimony and bismuth over the temperature range 200 °K to 8 °K, and 200 °K to 45 °K respectively, made using an optical lever dilatometer, are discussed. The principal linear expansion coefficients αperpendicular and αparallel in the directions perpendicular and parallel to the trigonal axis are tabulated and shown graphically as functions of temperature. For both materials αperpensicular is considerably less than αparallel, with antimony showing the greater anisotropy. αperpendicular for antimony is negative below 20 °K, passing through a minimum at 148 °K. Calculated values of the Gruneisen parameters, γperpendicular and γparallel, corresponding to αperpendicular and αparallel are tabulated together with estimates of the high-temperature limiting values of γperpendicular and γparallel.


Journal ArticleDOI
TL;DR: In this paper, the authors measured the reflectance of antimony and bismuth films at various angles of incidence, for photon energies between 10 and 26 eV, and calculated the optical constants n and k, which in turn yield ∊1 and ∊2 as well as the real and imaginary parts of ∊−1.
Abstract: We have measured the reflectance of antimony and bismuth films at various angles of incidence, for photon energies between 10 and 26 eV. Reflectance values have been used to calculate the optical constants n and k, which in turn yield ∊1 and ∊2 as well as the real and imaginary parts of ∊−1. For antimony, the ∊−1 function can be closely fitted with the inverted Drude–Sellmeier formula. The center of the resonance is at 16.0 eV, with a half-width of 5.2 eV, corresponding to a decay time of 1.2 × 10−16 sec. The bismuth data cannot be fitted with a simple Drude–Sellmeier model, but it is in good qualitative agreement with the known electron-energy absorption properties.

Journal ArticleDOI
TL;DR: In this paper, a bivalent anionic group such as SeO4, CrO4 or C2O4 has been used for the preparation of organoantimony compounds of the type R3SbX and (R 3Sb)2OX.
Abstract: Organoantimony compounds of the type R3SbX and (R3Sb)2OX, where R is methyl or phenyl, and X is a bivalent anionic group such as SeO4, CrO4, or C2O4, have been prepared. Structural characteristics ...

Journal ArticleDOI
TL;DR: In this paper, the effect of variables on antimony absorption and extraction of antimony were studied and procedures for small amounts of Antimony in metallurgical products and synthetic fibers were given.

Journal ArticleDOI
TL;DR: In this article, the conditions of laser-solid interaction are discussed; it is shown that critical temperatures and pressures for Sb and Te can be attained when a sufficiently strong laser interacts with these metals.
Abstract: Laser‐produced vapor of antimony and tellurium was analyzed with a time‐of‐flight mass spectrometer. Several new vapor species have been observed: Te5 and Sb3 are the most abundant species in the vapor of the respective metals. The conditions of laser–solid interaction are discussed; it is shown that critical temperatures and pressures for Sb and Te can be attained when a sufficiently strong laser interacts with these metals.


Journal ArticleDOI
01 Jan 1969-Analyst
TL;DR: In this paper, the rates of adsorption of antimony, cobalt, mercury and silver on cellulose, diethylaminoethyl and p-aminobenzyl celluloses and cellulose phosphate from diethyl ether have been measured.
Abstract: The rates of adsorption of antimony, cobalt, mercury and silver on cellulose, diethylaminoethyl and p-aminobenzyl celluloses and cellulose phosphate from diethyl ether have been measured. Columns were prepared with antimony and cobalt pre-treated celluloses and the chromatographic behaviour of dimethylamine, trimethylamine, aniline and ethylenediamine studied. It was shown that these metal-loaded celluloses can be used in ligand-exchange chromatography with organic solvents. Antimony pre-treated celluloses can also be used with aqueous solutions. X-ray diffraction spectra show that the technique proposed is undoubtedly ligand-exchange chromatography and not reversed-phase extraction.

Patent
21 Nov 1969
TL;DR: The SnO 2 : Sb 2 O 3 ratio in the modified tin oxide coating may be from 5-100 : 1 as mentioned in this paper, where SnO is a mixture of tin dioxide and antimony oxides formed in situ by coating with an organic solution of an organo-tin compound.
Abstract: 1277033 Modified tin oxide coating IMPERIAL CHEMICAL INDUSTRIES Ltd 17 Nov 1969 [13 Aug 1968] 59450/68 Heading C1A [Also in Division C7] Electrodes of titanium, zirconium, niobium, tantalum, tungsten or an alloy thereof are at least partially coated with a semi-conducting mixture of tin dioxide and antimony oxides formed in situ by coating with an organic solution of an organo-tin compound, e.g. namyloxytin and an antimony halide, drying the coating and heating it in an oxidizing atmosphere. Manganese, iron, cobalt or nickel difluoride may be suspended in the coating solution. The SnO 2 : Sb 2 O 3 ratio in the coating may be from 5-100 : 1.

Patent
29 Apr 1969
TL;DR: In this article, a pseudopylene is described as "RENDERED FLAME RETARDANT" without impairing its PHYSICAL PROPERTIES by incorporating in it an ADDITIVE COMPRISED OF TETRABROMOPHTHALIC ANHYDRIDE, A FUMED SILICA, AND ANTIMONY TRIOXIDE OR AN EQUIVALENT ANTIME COMPOUND.
Abstract: POLYPROPYLENE IS RENDERED FLAME RETARDANT WITHOUT IMPAIRING ITS PHYSICAL PROPERTIES BY INCORPORATING IN IT AN ADDITIVE COMPRISED OF TETRABROMOPHTHALIC ANHYDRIDE, A FUMED SILICA, AND ANTIMONY TRIOXIDE OR AN EQUIVALENT ANTIMONY COMPOUND.

Journal ArticleDOI
TL;DR: In this article, the application of atomic absorption to the micro determination of antimony, iron, and molybdenum in nickel and uranium is described, where the extract is then analyzed directly by atomic absorption techniques.

Journal ArticleDOI
TL;DR: Antimony films in the thickness range of 50 to 250 A prepared by vacuum evaporation on single crystal KCL substrates at room temperature show an amorphous structure, which changes readily to the crystalline form on exposure to a 40-100kV electron beam of moderate intensity in the electron microscope as mentioned in this paper.
Abstract: Antimony films in the thickness range of 50 to 250 A prepared by vacuum evaporation on single crystal KCL substrates at room temperature show an amorphous structure, which changes readily to the crystalline form on exposure to a 40–100‐kV electron beam of moderate intensity in the electron microscope. At the nucleation stage thin films show a random orientation on crystallization, whereas thicker, nearly continuous films assume a single crystalline orientation, with (111)metal‖(001)KCl.

Patent
07 Aug 1969
TL;DR: CATALYSTS as mentioned in this paper are defined as "catalysts" which are characterized by a combination of PLLADIUM and a trivalent PHOSPHORUS, ARSENIC or ANTIMONY LIGAND.
Abstract: CATALYSTS ARE PROVIDED WHICH AE COMPRISED OF PLLADIUM AND A TRIVALENT PHOSPHORUS, ARSENIC OR ANTIMONY LIGAND. THE CATALYSTS OF THIS INVENTION ARE HIGHLY EFFECTIVE AS CATALYSTS IN HYDROSILATION REACTIONS.

Journal ArticleDOI
TL;DR: A neutron activation technique for determining chromium in blood serum and red cells is described and 0·35−0·23 μg chromium were found per ml of serum or red cells.

Journal ArticleDOI
TL;DR: In this article, attempts to produce large single crystals of antimony sulpho-iodide from the pure molten material were described along with attempts to alter the electrical characteristics, and it was shown that except at very low growth rates, it is probably not possible to achieve the first objective.
Abstract: Attempts to produce large single crystals of antimony sulpho-iodide from the pure molten material are described along with attempts to alter the electrical characteristics. The results indicate that, except at very low growth rates, it is probably not possible to achieve the first objective. The second objective is also shown to be difficult to attain.

Patent
19 Mar 1969
TL;DR: In a photocathode comprising a substrate of tin oxide having thereon a photoemissive coating including antimony, a layer of antimony oxide is interposed between the tin oxide substrate and the photoemrousive coating as mentioned in this paper.
Abstract: In a photocathode comprising a substrate of tin oxide having thereon a photoemissive coating including antimony, a layer of antimony oxide is interposed between the tin oxide substrate and the photoemissive coating.