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Chemical state

About: Chemical state is a research topic. Over the lifetime, 2378 publications have been published within this topic receiving 78183 citations.


Papers
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Journal ArticleDOI
TL;DR: In this article, the chemical state and environment of Palladium catalysts were studied by UV-visible diffuse reflectance spectroscopy along the successive preparation stages and the species formed upon interaction of precursors with the carriers were identified and their transformations upon calcination and reduction were studied.
Abstract: Palladium catalysts are prepared from various precursors (chloride, nitrate, acetylacetonate) by using different methods of precursor bonding on 2 types of alumina. The chemical state and environment of Pd is studied by UV-visible diffuse reflectance spectroscopy along the successive preparation stages. The species formed upon interaction of precursors with the carriers are identified and their transformations upon calcination and reduction are studied. The reactivity of oxide «clusters» towards NH 3 is used as a criterion of their dispersion
Journal ArticleDOI
TL;DR: In this article, the chemical behavior of radiorhenium formed by the Ir( p, 3 pxn )Re nuclear reaction with 660 MeV protons has been investigated and the effects of water of crystallization and ammonium ion as well as of the radiation dose on the yield of Re(VII) are described.
Patent
29 Sep 2016
TL;DR: In this article, a nanocomposite material for use as an optical data recording medium comprises nanoparticles embedded in a host matrix, wherein the host matrix comprises a material having a high structural stability, and the nanoparticles comprise optical functional components having a first physical or chemical state and a property of permanent transition to a second physical/chemical state upon exposure to corresponding optical radiation.
Abstract: Provided are media, systems and methods for optical data storage. A nanocomposite material for use as an optical data recording medium comprises nanoparticles embedded in a host matrix, wherein the host matrix comprises a material having a high structural stability, and the nanoparticles comprise optical functional components having a first physical or chemical state and a property of permanent transition to a second physical or chemical state upon exposure to corresponding optical radiation, whereby information may be recorded in the first and second physical or chemical states of the optical functional components over an extended time period.
01 Jan 1988
TL;DR: In this article, the X-ray photoelectron spectroscopy (xrs) was used to extract, in a semiquantitative manner, the ratio of trivalent to tetravalent Ti species in synthetic [Ba,Cs,][(A1,Ti3*)2,+yTifi2"-,]O,u hollandites.
Abstract: AssrRAcr A priori knowledge of the valence adopted by transition-metal elements in minerals frequently provides useful insight into their petrogenesis. Generally, one or more of the several well-established spectroscopic methods (e.g., Mdssbauer, UV-visible, X-ray absorption) are used to determine the chemical state of cationic species. A more recent technique, which is now gaining increasing acceptance for such studies, is X-ray photoelectron spectroscopy (xrs). In this paper, we report the way in which xPS may be used to extract, in a semiquantitative manner, the ratio of trivalent to tetravalent Ti species in synthetic [Ba,Cs,][(A1,Ti3*)2,+yTifi2"-,]O,u hollandites. The Ti3+/Ti4+ ratios found by xrs are in qualitative agreement with those derived indirectly from classical electron-microprobe analysis. The quantitative discrepancies can be ascribed to the presence of rutile in minor amounts. Generalized guidelines for the use of xps to obtain compositional and chemical information about mineral specimens are outlined.

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202326
202249
202184
202089
201987
201894