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Titolo:
Syntheses, crystal structures, and properties of EuRhIn, EuIr2, and EuIrSn2
Autore:
Pottgen, R; Hoffmann, RD; Moller, MH; Kotzyba, G; Kunnen, B; Rosenhahn, C; Mosel, BD;
Indirizzi:
Univ Munster, Inst Anorgan Chem, D-48149 Munster, Germany Univ Munster Munster Germany D-48149 rgan Chem, D-48149 Munster, Germany Univ Munster, Inst Phys Chem, D-48149 Munster, Germany Univ Munster Munster Germany D-48149 Phys Chem, D-48149 Munster, Germany
Titolo Testata:
JOURNAL OF SOLID STATE CHEMISTRY
fascicolo: 1, volume: 145, anno: 1999,
pagine: 174 - 181
SICI:
0022-4596(199906)145:1<174:SCSAPO>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
VALENCE INSTABILITIES; TRANSITION-METAL; TERNARY PHASES; KHG2 TYPE; EUROPIUM; EUZNSN; VIEW;
Keywords:
intermetallic europium compounds; crystal structure; magnetism; Eu-151 Mossbauer spectroscopy;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Pottgen, R Univ Munster, Inst Anorgan Chem, Wilhelm Klemm Str 8, D-48149 Munster, Germany Univ Munster Wilhelm Klemm Str 8 Munster Germany D-48149 rmany
Citazione:
R. Pottgen et al., "Syntheses, crystal structures, and properties of EuRhIn, EuIr2, and EuIrSn2", J SOL ST CH, 145(1), 1999, pp. 174-181

Abstract

The title compounds mere prepared from the elements by reactions in sealedtantalum tubes in a high-frequency furnace. Their structures were refined from single crystal X-ray diffractometer data: Pnma, a = 744.4(1) pm, b = 434.15(9) pm, c = 845.5(1) pm, wR2 = 0.0433, 658 F-2 values, 20 variables for EuRhIn, Fd3m, a = 756.5(1) pm, wR2 = 0.0349, 94 F-2 values, 5 variables for EuIr2, and Cmcm, a = 434.78(3) pm, b = 1124.0(1) pm, c = 751.20(5) pm, wR2 = 0.0561, 565 F-2 values, 16 variables for EuIrSn2. EuRhIn crystallizes with a TiNiSi type structure that consists of strongly puckered Rh,In, hexagons. The europium atoms fill the channels within the three-dimensional [RhIn] polyanion. EuRhIn orders ferromagnetically at 22.0(5) K with a saturation magnetic moment of 6.7(1) mu(B)/Eu at 4 K and 5.5 T. The divalent character of the europium atoms in EuRhIn was determined from temperature dependent susceptibility (7.9 mu(B)/Eu in the high-temperature part) and Eu-151 Mossbauer spectroscopic experiments. The latter show an isomer shift of delta= -8.30(2) mm/s at 78 It. At 4.2 K full magnetic hyperfine field splittingsubjected to significant quadrupole splitting of Delta E-Q = 8 mm/s is observed. EuRhIn is a metallic conductor with a room temperature value of 58 mu Omega cm for the specific resistivity. The structure of the Laves phase EuIr2 is confirmed on the basis of single crystal X-ray data. The iridium atoms form a tetrahedral network with Ir-Ir distances of 268 pm. EuIrSn2 adopts a MgCuAl2 type structure that may be described as an iridium-filled variant of a distorted CaIn2-like sublattice of composition EuSn2. The tin atoms in the distorted and puckered hexagonal network have shorter (303 and 322pm) and longer (343 pm) tin-tin contacts. (C) 1999 Academic Press.

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Documento generato il 09/07/20 alle ore 19:41:18