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Titolo:
LOCAL ORDER REFINEMENT IN LIQUID LITHIUM-NIOBATE USING A 2-RADIATION METHOD (X-RAYS AND NEUTRONS)
Autore:
ANDONOV P; CHIEUX P; KIMURA S; WASEDA Y;
Indirizzi:
LAB MAGNETISME & MAT MAGNET BELLEVUE,1 PL ARISTIDE BRIAND F-92195 MEUDON FRANCE INST MAX VON LAUE PAUL LANGEVIN F-38042 GRENOBLE FRANCE NATL INST RES INORGAN MAT TSUKUBA IBARAKI 305 JAPAN TOHOKU UNIV,INST ADV MAT PROC SENDAI MIYAGI 980 JAPAN
Titolo Testata:
Zeitschrift fur Naturforschung. A, A journal of physical sciences
fascicolo: 10, volume: 48, anno: 1993,
pagine: 955 - 964
SICI:
0932-0784(1993)48:10<955:LORILL>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
LINBO3; CRYSTALS; GROWTH;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
P. Andonov et al., "LOCAL ORDER REFINEMENT IN LIQUID LITHIUM-NIOBATE USING A 2-RADIATION METHOD (X-RAYS AND NEUTRONS)", Zeitschrift fur Naturforschung. A, A journal of physical sciences, 48(10), 1993, pp. 955-964

Abstract

In the molten LiNbO3,the local order of the first neighbouring atoms has been described using the total structure factors S(Q)((x)) and S(Q)((n)) and the total pair correlation functions G(r)((x)) and G(r)((n)) obtained by X-ray and neutron scattering, respectively. We have alsocompared the differences [RDF(r)((x)) - RDF(r)((k))] of the radial distributions obtained from experiments and computed from the distances ln the LiNbO3 crystal. With this refinement it was possible to extractthe first pair distances r(1,Nb-0,)r(1,Li-0) and r(1,0-0) with the high accuracy Delta r/r approximate to 0.5%. These values are identical with those in the crystal. Fitting the RDF curves by Gaussian components centred around these distances, the first coordination numbers, n(1,Nb-0),n(1,Li-0) and n(1,0-0,) have been determined with an accuracy Delta n/n approximate to 2%. Octahedrally coordinated niobium atoms arepresent in the melt in the studied range from 1623 K to 1490 K. From these results it is inferred that aggregates built from corner-sharingoctahedra, tightened by lithium atoms, are present in the melt.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/09/20 alle ore 02:08:01