Universal Stability and Temperature Dependent Phase Transformation in Group VIIIB–IB Transition Metal FCC Nanowires

2011 ◽  
Vol 115 (21) ◽  
pp. 10394-10398 ◽  
Author(s):  
Vijay Kumar Sutrakar ◽  
D. Roy Mahapatra
Keyword(s):  
Phase Transformation ◽  
Transition Metal ◽  
Temperature Dependent ◽  
Universal Stability

Ternary indides RE3T2In4 (RE=Dy–Tm; T=Pd, Ir)

2018 ◽  
Vol 73 (11) ◽  
pp. 765-772 ◽  
Author(s):  
Sebastian Stein ◽  
Lukas Heletta ◽  
Rainer Pöttgen
Keyword(s):  
Magnetic Susceptibility ◽  
Rare Earth ◽  
Transition Metal ◽  
Magnetic Moments ◽  
Hexagonal Structure ◽  
Temperature Dependent ◽  
X Ray ◽  
Wyckoff Position ◽  
Different Types ◽  
High Temperature Reactions

AbstractThe ternary rare earth transition metal-indides RE3T2In4 (RE=Dy–Tm; T=Pd, Ir) were obtained from high-temperature reactions in sealed niobium ampoules. These indides adopt a hexagonal structure of the Lu3Co1.87In4 type (space group P6̅), a ternary ordered superstructure of the aristotype Fe2P. The structures of three different compounds were refined from single-crystal X-ray diffractometer data: a=768.20(6), c=381.97(3) pm, 1441 F2 values, 24 parameters, wR2=0.0338 (Ho3Pd1.90In4); a=774.98(3), c=378.51(2) pm, 577 F2 values, 23 parameters, wR2=0.0742 (Ho3Ir1.69In4.31) and a=780.3(1), c=369.4(1) pm, 573 F2 values, 22 parameters, wR2=0.0403 (Tm3Ir1.51In4.49). Refinements of the occupancies revealed homogeneity ranges in case of the iridium-based crystals resulting from Ir/In mixing. The refined composition of the palladium compound was Ho3Pd1.90In4 resulting from defects on the Wyckoff position 1d, which was already reported for the prototype Lu3Co1.87In4. The geometrical motifs of the RE3T2In4 structures are three different types of tricapped trigonal prisms around the transition metal and indium atoms which are condensed via common edges and triangular faces. Temperature dependent magnetic susceptibility measurements of Dy3Ir2In4 and Tm3Ir2In4 showed Curie-Weiss behavior and the experimental magnetic moments of 10.59(2) μB (Dy3Ir2In4) and 7.40(2) μB (Tm3Ir2In4) confirming stable trivalent RE3+ states. Dy3Ir2In4 and Tm3Ir2In4 order antiferromagnetically with Néel temperatures of TN=13.6(5) and 5.4(5) K, respectively.

Gehinderte Ligandenbewegungen in Übergangsmetallkomplexen, X1 Carbonyl-donorligand-η-1.3.5-cycloheptatrien-chrom(0)-Komplexe / Hindered Ligand Motions in Transition Metal Complexes, X1 Carbonyl-donorligand-η-1,3,5-cycloheptatriene-chromium(0) Complexes

1976 ◽  
Vol 31 (9) ◽  
pp. 1238-1247 ◽  
Author(s):  
Mahmud Djazayeri ◽  
Cornelius G. Kreiter ◽  
Hans M. Kurz ◽  
Mehrfar Lang ◽  
Saim Özkar
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Nmr Spectra ◽  
Temperature Dependent ◽  
Energy Barriers

Tricarbonyl-η-1,3,5-cycloheptatriene-chromium(0) (1) reacts photochemically with trimethyl-phosphine, -arsine, or -phosphite respectively to form the complexes CrC7H8(CO)2L (2-4) (L = P(CH3)3, As(CH3)3, P(OCH3)3) and CrC7H8(CO)[P(OCH3)3]2 (5) The 1H, 13C and 31P NMR spectra of these complexes are temperature dependent as a result of a hindered motion of the C7H8 ligand. By this motion the dissimilar stereoisomers of the complexes, which are present, partly in very different concentrations, are interconverted. The energy barriers of the isomerisations were determined.

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