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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.


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Journal ArticleDOI
TL;DR: In this article, a single solution reagent was described for the determination of phosphorus in sea water, which consists of an acidified solution of ammonium molybdate containing ascorbic acid and a small amount of antimony.

17,606 citations

Journal ArticleDOI
TL;DR: Antimony is ubiquitously present in the environment as a result of natural processes and human activities as discussed by the authors and is considered to be priority pollutants interest by the USEPA and the EU.

1,051 citations

Journal ArticleDOI
TL;DR: In this article, the authors showed that the activity of a photocatalyst with antimony and chromium was remarkably higher than that of one with only chromium and that the charge balance was kept by codoping of Sb5+ and Cr3+ ions, resulting in the suppression of formation of Cr6+ ions and oxygen defects in the lattice.
Abstract: TiO2 and SrTiO3 codoped with antimony and chromium showed intense absorption bands in the visible light region and possessed 2.2 and 2.4 eV of energy gaps, respectively. TiO2 codoped with antimony and chromium evolved O2 from an aqueous silver nitrate solution under visible light irradiation, while SrTiO3 codoped with antimony and chromium evolved H2 from an aqueous methanol solution. The activity of TiO2 photocatalyst codoped with antimony and chromium was remarkably higher than that of TiO2 doped with only chromium. It was due to that the charge balance was kept by codoping of Sb5+ and Cr3+ ions, resulting in the suppression of formation of Cr6+ ions and oxygen defects in the lattice which should work as effectively nonradiative recombination centers between photogenerated electrons and holes.

782 citations

Journal ArticleDOI
TL;DR: Based on first-principles calculations, a model for large-size-mismatched group-V dopants in ZnO agrees with the recent observations that both As and Sb have low acceptor-ionization energies and that to obtain p-type Zn O requires O-rich growth or annealing conditions.
Abstract: Based on first-principles calculations, a model for large-size-mismatched group-V dopants in ZnO is proposed. The dopants do not occupy the O sites as is widely perceived, but rather the Zn sites: each forms a complex with two spontaneously induced Zn vacancies in a process that involves fivefold As coordination. Moreover, an As(Zn)-2V(Zn) complex may have lower formation energy than any of the parent defects. Our model agrees with the recent observations that both As and Sb have low acceptor-ionization energies and that to obtain p-type ZnO requires O-rich growth or annealing conditions.

600 citations

Journal ArticleDOI
TL;DR: In this paper, the same ball milling and hot press technique was used to obtain a peak ZT of about 1.3 in the temperature range of 75 and 100 °C.
Abstract: By ball milling alloyed bulk crystalline ingots into nanopowders and hot pressing them, we had demonstrated high figure-of-merit in nanostructured bulk bismuth antimony telluride. In this study, we use the same ball milling and hot press technique, but start with elemental chunks of bismuth, antimony, and tellurium to avoid the ingot formation step. We show that a peak ZT of about 1.3 in the temperature range of 75 and 100 °C has been achieved. This process is more economical and environmentally friendly than starting from alloyed bulk crystalline ingots. The ZT improvement is caused mostly by the lower thermal conductivity, similar as the case using ingot. Transmission electron microscopy observations of the microstructures suggest that the lower thermal conductivity is mainly due to the increased phonon scattering from the increased grain boundaries of the nanograins, precipitates, nanodots, and defects. Our material also exhibits a ZT of 0.7 at 250 °C, similar to the value obtained when ingot was used. This study demonstrates that high ZT values can be achieved in nanostructured bulk materials with ball milling elemental chunks, suggesting that the approach can be applied to other materials that are hard to be made into ingot, in addition to its advantage of lower manufacturing cost.

517 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023361
2022832
2021249
2020290
2019361
2018334