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Titolo:
INFLUENCE OF HYDRIDING ON THE MAGNETIC-PROPERTIES OF GD3NI6AL2
Autore:
PECHEV S; CHEVALIER B; KHRUSSANOVA M; TERZIEVA M; BOBET JL; DARRIET B; PESHEV P;
Indirizzi:
UNIV BORDEAUX 1,CNRS,UPR 9048,INST CHIM MAT CONDENSEE BORDEAUX,162 AVE DU DOCTEUR A SCHWEITZER F-33608 PESSAC FRANCE UNIV BORDEAUX 1,CNRS,UPR 9048,INST CHIM MAT CONDENSEE BORDEAUX F-33608 PESSAC FRANCE BULGARIAN ACAD SCI,INST GEN & INORGAN CHEM BU-1113 SOFIA BULGARIA
Titolo Testata:
Journal of alloys and compounds
fascicolo: 1-2, volume: 259, anno: 1997,
pagine: 24 - 28
SICI:
0925-8388(1997)259:1-2<24:IOHOTM>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTERMETALLIC COMPOUNDS; CRYSTAL-STRUCTURE; RARE-EARTH; GD; DY; ER;
Keywords:
GD3NI6AL2; GD3NI6AL2H8.6; PREPARATION; HYDRIDING; FERROMAGNETIC PROPERTIES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
19
Recensione:
Indirizzi per estratti:
Citazione:
S. Pechev et al., "INFLUENCE OF HYDRIDING ON THE MAGNETIC-PROPERTIES OF GD3NI6AL2", Journal of alloys and compounds, 259(1-2), 1997, pp. 24-28

Abstract

Some details of the synthesis peculiarities of the intermetallic Gd3Ni6Al2 compound have been studied. It has been shown that this compoundcan only be prepared after prolonged annealing of a multiphase product obtained by melting of the constituent metals in a stoichiometric ratio. However, even after this treatment the samples contain some impurities, as proved by X-ray and electron microprobe analysis. As a result of a kinetic study on hydrogen uptake, the formation of a ternary hydride with a maximum content of 8.6 H atoms per formula unit of Gd3Ni6Al2 has been confirmed. In this hydride the original cubic Ca3Ag8-typestructure is preserved and only an increase of the unit cell parameter of about 1.45% is observed. Resistivity and low field magnetization measurements have shown the occurrence of ferromagnetic ordering in Gd3Ni6Al2 at T-c=118(1) K. The value of M-sat=7.3(4) mu(B)/Gd is reachedal B=4.8 T, which is very close to the saturation moment of 7.0 mu(B)calculated for a Gd3+ ion. Hydrogen absorption leads to an important decrease of the Curie temperature (T-c=69(1) K for Gd3Ni6Al2H8.6). Similarly to the parent compound, a value of 7.0(1) mu(B)/Gd is obtained far the saturation moment of the hydride al B=4.8 T. An attempt is made to explain this behaviour by a non-uniform spatial distribution of Hatoms in the hydrided sample as well as by a weakening of the Gd-Gd interactions in this sample caused by the increase of the lattice constant. (C) 1997 Elsevier Science S.A.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/04/20 alle ore 11:14:35