ZfN: Search Results

1	Author	Ratikanta Mishra, Rainer Pöttgen, Gunter Kotzyba	Requires cookie*
	Title	New Metal-Rich Compounds NblrSi, NblrGe, and TalrSi -Synthesis, Structure, and Magnetic Properties
	Abstract	The metal-rich intermetallic compounds NblrSi, NblrGe, and TalrSi were synthesized by arc-melting of the elements and subsequent annealing in glassy carbon crucibles in a high-fre-quency furnace. The three compounds were investigated by X-ray diffraction on powders and single crystals: TiNiSi type, Pnma, a = 641.27(3), b = 379.48(2), c = 727.70(3) pm, wR2 = 0.0773, 430 F 2 values for NblrSi, a = 645.48(3), b = 389.21(2), c = 741.11(4) pm, wR2 = 0.0981, 297 F 2 values for NblrGe, and a = 638.11(3), b = 378.69(2), c = 726.78(3) pm, wR2 = 0.0887, 290 F 2 values for TalrSi with 20 variables for each refinement. The iridium and silicon (germanium) atoms form a three-dimensional network of puckered IrjSi3 and Ir3Ge3 hexagons in which the niobium (tantalum) atoms fill larger cages. Magnetic susceptibility measurements on NblrSi and TalrSi indicate Pauli paramagnetism with room temperature susceptibilities of 0.30(5)-10~9 and 0.97(5)-10-9 m3/mol, respectively.
	Reference	Z. Naturforsch. 56b, 463 (2001); received April 30 2001
	Published	2001
	Keywords	Silicides, Germanides, Magnetic Properties
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	default:Reihe_B/56/ZNB-2001-56b-0463.pdf
	Identifier	ZNB-2001-56b-0463
	Volume	56

2	Author	Thom As Fickenscher, G. Unter Kotzyba, Rolf-D Ieter, H. Offm, Ann, R. Ainer Pöttgen, H. P. Fritz	Requires cookie*
	Title	Synthesis, Structure, and Magnetic Properties of EuAgCd and YbAgCd
	Abstract	New intermetallic compounds EuAgCd and YbAgCd were synthesized in quantitative yield by reaction of the elements in sealed tantalum tubes in a high-frequency furnace. Both com pounds were investigated by X-ray diffraction on powders and single crystals: KHg2 type, Imma, a = 490.41(8), b = 771.0(1), c = 834.4(2) pm, wR2 = 0.0624, 255 F values, 12 variables for EuAgCd, and MgZn2 type, Pb^/mmc, a = 584.66(5), c = 946.83(9) pm, wR2 = 0.0502, 187 F 2 values, 11 variables for YbAgCd. Owing to the very small difference in scattering power, no long range ordering of the silver and cadmium atoms is evident from the X-ray data, although Ag-Cd ordering is expected. The silver and cadmium atoms randomly occupy the mercury and zinc positions of the KHg2 and MgZn2 type structures, respectively. In EuAgCd the [AgCd] substructure consists of strongly puckered, orthorhombically distorted Ag3 Cd3 hexagons, while a three-dimensional network of face-and comer-sharing tetrahedra is observed in YbAgCd. The rare earth atoms fill the space between the Ag3 Cd3 hexagons (EuAgCd) or within the three-dimensional tetrahedral network (YbAgCd). Magnetic susceptibility measurements in dicate Pauli paramagnetism for YbAgCd and Curie-Weiss behavior above 60 K for EuAgCd with an experimental magnetic moment of 7.82(3) /j b/Eu indicating divalent ytterbium and europium. Ferromagnetic ordering at Tc = 28.0(5) K is observed for EuAgCd. At 2 K and 5 T the saturation magnetization is 5.85(5) /iß/Eu.
	Reference	Z. Naturforsch. 56b, 598—603 (2001); received April 12 2001
	Published	2001
	Keywords	Cadmium, Crystal Structure, Magnetic Properties
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	default:Reihe_B/56/ZNB-2001-56b-0598.pdf
	Identifier	ZNB-2001-56b-0598
	Volume	56