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Titolo:
Absence of chromatic effect: crystal relaxation around Ce-III in Y1-xCexPS4 (0 <= x <= 1)
Autore:
Gauthier, G; Klur, Y; Pourpoint, A; Jobic, S; Ouvrard, G; Brec, R; Huguenin, D; Macaudiere, P;
Indirizzi:
Univ Nantes, Inst Mat Jean Rouxel, Lab Chim Solides, CNRS,UMR 6502, F-44322 Nantes 3, France Univ Nantes Nantes France 3 des, CNRS,UMR 6502, F-44322 Nantes 3, France Rhodia Rech, F-93308 Aubervilliers, France Rhodia Rech Aubervilliers France F-93308 , F-93308 Aubervilliers, France IMRA Europe SA, F-06904 Sophia Antipolis, France IMRA Europe SA Sophia Antipolis France F-06904 Sophia Antipolis, France
Titolo Testata:
INTERNATIONAL JOURNAL OF INORGANIC MATERIALS
fascicolo: 6, volume: 2, anno: 2000,
pagine: 717 - 722
SICI:
1466-6049(200012)2:6<717:AOCECR>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRONIC-STRUCTURE; COLOR;
Keywords:
Y1-xCexPS4 solid solution; chromatic properties; network relaxation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Jobic, S Univ Nantes, Inst Mat Jean Rouxel, Lab Chim Solides, CNRS,UMR 6502, BP 32229, F-44322 Nantes 3, France Univ Nantes BP 32229 Nantes France 39, F-44322 Nantes 3, France
Citazione:
G. Gauthier et al., "Absence of chromatic effect: crystal relaxation around Ce-III in Y1-xCexPS4 (0 <= x <= 1)", INT J INORG, 2(6), 2000, pp. 717-722

Abstract

Ce-containing chalcogenides may exhibit interesting chromatic properties due to the presence of a Ce-III-5f/Ce-III-4d gap. In such insulating materials, color varies from red to yellow depending on the covalent character of the Ce-S bond. Thanks to this correlation, a continuous modification of theCe-S bond characteristics may be induced to control the hue. Attempts in modifying these bonds have been undertaken by synthesizing the solid solution Y1-xCexPS4 (x = 0, 0.005, 0.01, 0.05 and 0.1), YPS4 being colorless. The substitution of Y3+ cations (rY(3+)(CN8) = 1.019 Angstrom) for Ce3+ cations(rCe(3+) (CN8) = 1.143 Angstrom) let expect a regular shift of the physical parameters deemed to influence the chromatic properties. Nevertheless, diffuse reflectance measurements did not evidence any absorption threshold shift vs. x in the Y1-xCexPS4 series. The lack of sizeable influence of the Y/Ce substitution on the color is correlated not only to the intrasite, bandto band nature of the Ce-5f-->Ce-4d transition, but also to the occurrenceof local relaxations around Ce in the YPS4:Ce solid solution insuring a chemical environment of the rare earth very similar to that observed in CePS4. EXAFS measurements performed at the Y-K and the Ce-L-III edges evidence the maintaining of the average Y-S and Ce-S distances in the Y1-xCexPS4 solution from x=0 to x=1 as they are in the non-substituted end compounds YPS4 and CePS4. (C) 2000 Elsevier Science Ltd. All rights reserved.

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Documento generato il 05/07/20 alle ore 00:28:08