Antimony

About: Antimony is a research topic. Over the lifetime, 11450 publications have been published within this topic receiving 155660 citations. The topic is also known as: Sb & element 51.

Antimony oxide glass with optical activity

Abstract: A glass consisting essentially of antimony oxide. An optically active glass consisting essentially of antimony oxide and up to about 4 mole % of an oxide of a rare earth element. A rare earth-doped, antimony oxide-containing glass including 0-99 mole % SiO2, 0-99 mole % GeO2, 0-75 mole % (Al, Ga)2O3, 0.5-99 mole % Sb2O3, and up to about 4 mole % of an oxide of a rare earth element. The oxide of the rare earth element may comprise Er2O3. The glass of the invention further includes fluorine, expressed as a metal fluoride. An optical energy-producing or light-amplifying device, in particular, an optical amplifier, comprising the above-described glass. The optical amplifier can be either a fiber amplifier or a planar amplifier, either of which may have a hybrid composition. Embodiments of the glass of the invention can be formed by conventional glass making techniques, while some of the high content antimony oxide embodiments are formed by splat or roller quenching.

Pentavalent organoantimonial derivatives: two simple and efficient synthetic methods for meglumine antimonate

Abstract: Two simple and efficient procedures for the preparation of pentavalent antimony derivatives are described, using either antimony pentachloride (SbCl5) or potassium hexahydroxoantimonate (KSb(OH)6) as sources of antimony(V). These two new methods are evaluated for the synthesis of an important anti-leishmanial drug: meglumine antimonate. Using elemental (carbon, hydrogen, nitrogen) and thermal analysis, atomic absorption (antimony), proton NMR spectroscopy and high-resolution positive-ion electrospray ionization mass spectrometry (ESI(+)-MS), products for the reaction with N-methyl-D-glucamine (NMG) using both the SbCl5 and KSb(OH)6 methods were characterized and found to be similar to a commercial sample of the drug. The only notable difference was observed for the ESI-MS spectrum of the KSb(OH)6 product; it displays the same pattern of ESI-generated ions as those of both the SbCl5 product and the commercial drug, but with significantly different abundance ratios. NMR data indicate that the NMG molecules coordinate antimony in two different fashions, which suggests either the coexistence of two different complexes or the existence of a single major complex in which two NMG molecules are coordinated with antimony in an asymmetrical geometry. Copyright © 2003 John Wiley & Sons, Ltd.

Self-diffusion of gallium and antimony in GaSb

Abstract: Self-diffusion of gallium and antimony in GaSb has been investigated in both Ga-saturated and Sb-saturated single crystals at temperatures ranging from 867 K to the temperature of congruent melting. The radio-isotopes 72Ga and I22 Sb were diffused simultaneously to avoid composition gradients. After sputter-sectioning, the penetration profiles for both isotopes were obtained by means of a Ge(Li) spectrometer. It is found that Ga diffuses slightly faster than Sb and that the composition plays an important role: Ga and Sb diffuse faster in Sb-rich than in Ga-rich samples. The temperature dependence of both diffusivities resembles that of the Sb partial pressure over the compound. Several mechanisms of diffusion are discussed in the light of these observations. The coupled diffusion of Ga and Sb leads us to conclude that both components diffuse via the same defect. In view of the special type of defect structure in GaSb, we propose that the triple defect is the predominant diffusion vehicle for both...