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Titolo:
LOCAL ORDER IN THE LINBO3 MELT - COMPARISON WITH THE CRYSTALLINE PHASES
Autore:
ANDONOV P; CHIEUX P; KIMURA S;
Indirizzi:
CNRS BELLEVUE,MAGNETISME & MAT MAGNET LAB,1 PL ARISTIDE BRIAND F-92192 MEUDON FRANCE INST MAX VON LAUE PAUL LANGEVIN F-38042 GRENOBLE FRANCE NATL INST RES INORGAN MAT TSUKUBA IBARAKI 305 JAPAN
Titolo Testata:
Physica scripta. T
, volume: T57, anno: 1995,
pagine: 36 - 44
SICI:
0281-1847(1995)T57:<36:LOITLM>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
LITHIUM-NIOBATE; GROWTH;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
23
Recensione:
Indirizzi per estratti:
Citazione:
P. Andonov et al., "LOCAL ORDER IN THE LINBO3 MELT - COMPARISON WITH THE CRYSTALLINE PHASES", Physica scripta. T, T57, 1995, pp. 36-44

Abstract

From recent structural analysis of the LiNbO3 melt, carried out by means of Small Angle X-ray Scattering [SAXS] and High Temperature Diffraction [HTD], it has been possible to describe a local order reduced tothe first neighbours. The first three mean interatomic distances, r(1Nb-O), r(1Li-O) and r(1O-O) were extracted with the high accuracy Delta r/r = 0.5%. From the first three coordination numbers n(1Nb-O), n(1Li-O) and n(1O-O), it was verified that octahedrally coordinated niobium atoms exist in the melt and the liquid Local order shows only some weak deviations with the solid states. A comparison is made with the crystalline phases and particularly with the recent results obtained around the phase transition at T-c similar to 1430 K. The first interatomic distances in the paraelectric high temperature phase are higher than the values determined in the melt. This fact is explained by a possible rotation of the Nb-O6 octahedra which are more regular in the liquid. The small changes, observed in the Nb-O, Li-O and O-O bonds, are described in the model of the smallest aggregat constituted by only twoNb-O-6 octahedra Assuming expansion and tilt of the O-triangles and some broken O-O bonds, the decrease of the first three mean interatomicdistances r(ij), the broadening of their i-j distributions Delta r(ij) and the coordination numbers n(ij) can be explained.

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Documento generato il 20/09/20 alle ore 07:56:33