scholarly journals Crystal structure of the Al20Mn5.37Ni1.31 phase in the Al–Mn–Ni system

IUCrData ◽  
2021 ◽  
Vol 6 (9) ◽  
Author(s):  
Qifa Hu ◽  
Bin Wen ◽  
Changzeng Fan
Keyword(s):  
Chemical Composition ◽  
Transition Metal ◽  
Intermetallic Phase ◽  
Structure Type ◽  
Complementary Energy ◽  
X Ray ◽  
Group Type ◽  
Metal Atoms ◽  
Transition Metal Atoms ◽  
Initial Chemical Composition

The intermetallic phase with composition Al20Mn5.37Ni1.31 (icosaaluminium pentamanganese nickel) was synthesized by high-temperature sintering of a mixture with initial chemical composition Al60Mn7Ni3. Al20Mn5.37Ni1.31 adopts the Co2Al5 structure type in space-group type P63/mmc, replacing the Co atoms with the transition-metal atoms Mn and Ni. Structure analysis revealed that one of the two transition-metal sites is partially occupied by Ni [refined occupancy 0.342 (2)] and the other is co-occupied by Mn and Ni with a ratio of 0.895 (14):0.105 (14). The present refined chemical composition is supported by complementary energy-dispersive X-ray fluorescence (EDX) analysis and is in agreement with the previously determined Al–Mn–Ni phase diagram [Balanetskyy et al. (2011). J. Alloys Compd, 509, 3795–3805].

Ternary Antimonides LnTSb3 with Ln = La-Nd, Sm and T = V, Cr

1995 ◽  
Vol 50 (6) ◽  
pp. 899-904 ◽  
Author(s):  
Markus Brylak ◽  
Wolfgang Jeitschko
Keyword(s):  
Transition Metal ◽  
Single Crystal ◽  
Structure Type ◽  
Variable Parameters ◽  
X Ray ◽  
Metal Site ◽  
Metal Atoms ◽  
Transition Metal Atoms ◽  
Structure Factors ◽  
Infinite Strings

The title compounds were prepared by reaction of the elemental components. They crystallize in a new structure type, which was determined from single-crystal X -ray data of CeCrSb3: Pbcm, a = 1310.8(3), b = 618.4(1), c = 607.9(1) pm, Z = 4, R = 0.029 for 648 structure factors and 32 variable parameters. The structure of the antimonide CeVSb3 is isotypic: a = 1319.0(2), b = 623.92(8), c = 603.03(8) pm , R = 0.041 for 477 structure factors and 32 variables. The transition metal site and one of the three antimony sites were found to have partial occupancies resulting in the exact compositions CeV0,91(1)Sb2,916(4) and CeCr0,901(9)Sb2,909(4). The structures contain fractional Sb -Sb bonds with distances varying between 301,5 and 316.4 pm. The transition metal atoms have octahedral antimony coordination. These TSb6 octahedra share faces resulting in linear infinite strings with V - V and Cr - Cr bond distances of 301.5 and 304.0 pm, respectively. The structure of these com pounds contains building elements, which are also found in antimonides with ThCr2Si2, CaBe2Ge2, and HfCuSi2 type structures.

Ternary Intermetallic Compounds LnMn2Al10 (Ln = Y, La-Nd, Sm, Gd-Dy) and LnRe2Al10 (Ln = Ce, Pr, Sm) with CaCr2Al10-Type Structure

1998 ◽  
Vol 53 (7) ◽  
pp. 673-678 ◽  
Author(s):  
Verena M.T. Thiede ◽  
Wolfgang Jeitschko
Keyword(s):  
Transition Metal ◽  
Type Structure ◽  
Variable Parameters ◽  
X Ray ◽  
Metal Atoms ◽  
Transition Metal Atoms ◽  
Structural Relationships ◽  
Structure Factors ◽  
Ternary Intermetallic Compounds ◽  
First Time

Abstract The twelve title compounds have been prepared for the first time. Their CaCr2Al10-type structure (P4/nmm, Z = 4) was refined from single-crystal X-ray data for the three representatives TbMnAl10 (a = 1274.3(2) pm, c = 511.4(2) pm, R = 0.025 for 680 structure factors F and 43 variable parameters V), CeRe2Al10 (a = 1295.5(5) pm, c = 517.2(4) pm, R = 0.054 for 810 F and 46 V), and SmRe2Al10 (a = 1291.5(2) pm, c = 516.5(1) pm, R = 0.021 for 622 F and 46 V). The atomic positions of the lanthanoid and transition metal atoms are fully occupied. Significant deviations from the full occupancies were observed for two aluminum sites in TbMn2Al10 and for all five aluminum sites of the two rhenium-containing compounds, resulting in the compositions TbMn2Al9.63(2), CeRe2Al9.52(8), and SmRe2Al9.16(9). The cell volume of CeRe2Al10 and to a smaller extent also that of CeMn2Al10 indicate mixed or intermediate +III/+IV valencies of the cerium atoms in these compounds. The structural relationships between the three closely related body-centered tetragonal structures of ThMn12, CeMniAl8, DyFe6Al6 and the primitive tetragonal structure of CaCr2Al10 are briefly discussed.

Bis(2-{1-[(2,4,6-trimethylphenyl)imino]ethyl}pyrrol-1-ido-κ2N,N′)nickel(II): a supramolecular structure formed by C—H...π(arene) hydrogen bonds

2015 ◽  
Vol 71 (12) ◽  
pp. 1053-1056 ◽  
Author(s):  
Bi-Yun Su ◽  
Xiao-Teng Li ◽  
Jia-Xiang Wang ◽  
Xu-Dong Wang
Keyword(s):  
Transition Metal ◽  
Hydrogen Bonds ◽  
Transition Metal Complex ◽  
Supramolecular Assembly ◽  
Hydrogen Bond Donor ◽  
X Ray ◽  
Polydentate Ligands ◽  
Metal Atoms ◽  
Transition Metal Atoms ◽  
Donor And Acceptor

<!?tlsb=-0.2pt>Nitrogen-based polydentate ligands are of interest owing to their flexible complexation to transition metal atoms. For the title compound, [Ni(C15H17N2)2], a transition metal complex formed by the coordination of two identicalN,N′-bidentate mono(imino)pyrrolyl ligands to an NiIIcentre, an X-ray crystal diffraction study indicates that the two ligands show an inverted arrangement with respect to one another around the NiIIcentre, which is located on a crystallographic inversion centre. The planes of the aromatic substituents at the imine N atoms of the ligands show dihedral angles of 85.91 (5)° with respect to the NiN4plane. The Ni—N bond lengths are in the range 1.9072 (15)–1.9330 (15) Å and the Nimino—Ni—Npyrrolebite angles are 83.18 (6)°. The Ni—Npyrrolebond is substantially shorter than the Ni—Niminobond. Molecules are linked into an extensive network by means of intermolecular C—H...π(arene) hydrogen bonds in which every molecule acts both as hydrogen-bond donor and acceptor. The supramolecular assembly takes the form of an infinite two-dimensional sheet.

U3TiSb5, U3VSb5, U3CrSb5, and U3MnSb5 with "Anti"-Hf5Sn3Cu Type Structure

1994 ◽  
Vol 49 (6) ◽  
pp. 747-752 ◽  
Author(s):  
Markus Brylak ◽  
Wolfgang Jeitschko
Keyword(s):  
Transition Metal ◽  
Single Crystals ◽  
Type Structure ◽  
Interatomic Distances ◽  
X Ray ◽  
Lattice Constants ◽  
Arc Melting ◽  
Metal Atoms ◽  
Transition Metal Atoms ◽  
Structure Factors

The title compounds have been prepared from the elemental components by arc-melting and subsequent annealing. Single crystals of U3TiSb5 and U3MnSb5 were obtained from a tin flux and their structures were determined from single-crystal X-ray data: P63/mcm, Z = 2; a = 913.9(2), c = 611.2(1) pm, R = 0.011 (233 structure factors, 14 variables) for U3TiSb5 and a = 916.8(2), c = 613.2(1) pm, R = 0.015 (427 structure factors, 14 variables) for U3MnSb5. The lattice constants of the isotypic compounds are: a = 908.2(2), c = 608.3(2) pm for U3VSb5 and a = 911.0(1), c = 611.5(1) pm for U3CrSb5. The structure of these antimonides may be regarded as an “anti”-type structure of Hf5Sn3Cu with the antimony atoms on the hafnium sites, while the positions of the uranium and transition metal atoms correspond to the positions of the tin and copper atoms. A comparison of the interatomic distances of U3TiSb5 with those of U3Sb4, USb2, and a-antimony suggests oxidation numbers according to (U+III)3Ti+IV(Sb1-III)3(Sb2-II)2, where the Sb2 atoms form weakly bonded chains

Synthese und Struktur von achtgliedrigen Titan- und Zirkon-haltigen Siloxanringen / Synthesis and Structure of Eight-Membered Titanium and Zirconium Containing Siloxane Rings

1991 ◽  
Vol 46 (5) ◽  
pp. 587-592 ◽  
Author(s):  
Amal Haoudi-Mazzah ◽  
Ahmed Mazzah ◽  
Hans-Georg Schmidt ◽  
Mathias Noltemeyer ◽  
Herbert W. Roesky
Keyword(s):  
Structural Analysis ◽  
Transition Metal ◽  
Octahedral Geometry ◽  
Melting Points ◽  
X Ray ◽  
Bond Lengths ◽  
Multiple Bonding ◽  
Metal Atoms ◽  
Transition Metal Atoms ◽  
Solvent Molecules

Reaction of (tBu)2Si(OH)2 with TiCl4, TiBr4, TiI4, and ZrCl4 affords eight-membered rings 2a-2d. The X-ray structural analysis of 2a, 2b and 2d reveals in 2a and 2b tetrahedral and in 2d octahedral coordination at the transition metal atoms. The octahedral geometry in 2d is due to two additional coordinated solvent molecules. The Ti—O bond lengths in 2a and 2b are short indicating multiple bonding. Compounds 2a-2d are thermodynamically very stable having melting points above 250 °C.

Structural and 121Sb Mössbauer Spectroscopic Investigations of the Antimonide Oxides REMnSbO (RE = La, Ce, Pr, Nd, Sm, Gd, Tb) and REZnSbO (RE = La, Ce, Pr)

2008 ◽  
Vol 63 (7) ◽  
pp. 834-840 ◽  
Author(s):  
Inga Schellenberg ◽  
Tom Nilges ◽  
Rainer Pöttgen
Keyword(s):  
Transition Metal ◽  
Single Crystal ◽  
Single Crystals ◽  
Tetrahedral Coordination ◽  
Hyperfine Fields ◽  
Space Group ◽  
X Ray ◽  
Metal Atoms ◽  
Transition Metal Atoms ◽  
Covalently Bonded

Quaternary antimonide oxides REMnSbO (RE = La, Ce, Pr, Nd, Sm,Gd, Tb) and REZnSbO (RE = La, Ce, Pr) were synthesized from the RESb monoantimonides and MnO, respectively ZnO, in sealed tubes at 1170 K. Single crystals were obtained from NaCl/KCl salt fluxes. The ZrCuSiAs-type (space group P4/nmm) structures of LaMnSbO (a = 423.95(7), c = 955.5(27) pm, wR2 = 0.067, 247 F2), CeMnSbO (a = 420.8(1), c = 950.7(1) pm, wR2 = 0.097, 250 F2), SmMnSbO (a = 413.1(1), c = 942.3(1) pm, wR2 = 0.068, 330 F2), LaZnSbO (a = 422.67(6), c = 953.8(2) pm, wR2 = 0.052, 259 F2), and NdZnSbO (a = 415.9(1), c = 945.4(4) pm, wR2 = 0.109, 206 F2) were refined from single crystal X-ray diffractometer data. The structures consist of covalently bonded (RE3+O2−)+ and (T2+Sb3−)− layers with weak ionic interlayer interactions. The oxygen and transition metal atoms both have tetrahedral coordination within the layers. 121Sb Mössbauer spectra of the REMnSbO and REZnSbO compounds show single antimony sites with isomer shifts close to −8 mm s−1, in agreement with the antimonide character of these compounds. PrMnSbO and NdMnSbO show transferred hyperfine fields of 8 T at 4.2 K.

SrRhIn2, SrPdIn2, SrIrIn2, and SrPtIn2 – New Intermetallic Compounds with a Filled Variant of the CaIn2 Structure

1999 ◽  
Vol 54 (1) ◽  
pp. 38-44 ◽  
Author(s):  
Rolf-Dieter Hoffmann ◽  
Ute Ch. Rodewald ◽  
Rainer Pöttgen
Keyword(s):  
Transition Metal ◽  
High Frequency ◽  
X Ray Diffraction ◽  
X Ray ◽  
Bonding Analysis ◽  
Metal Bonding ◽  
Metal Atoms ◽  
Transition Metal Atoms ◽  
New Compounds ◽  
Transition Metal Bonding

SrRhIn2, SrPdIn2, Srlrln2, and SrPtIn2 have been synthesized by reaction of mixtures of the elements in glassy carbon crucibles in a high-frequency furnace. The new compounds were investigated by X-ray diffraction on powders as well as single crystals; a = 437.3(2), b = 1091.9(5), c = 798.0(2) pm for SrRhln2, a = 453.54(7), b = 1079.8(2), c = 790.4(1) pm for SrPdIn2, a = 434.83(8),b= 1102.6(2) ,c = 798.6(2) pm for Srlrln2, a = 447.5( 1) , b = 1091.0(3), c = 787.6( 1) pm for SrPtIn2. They adopt the MgCuAl2 structure, a ternary ordered version of Re3B. Chemical bonding analysis leads to the description of a filled Srln2 structure in which the In-in-bonding is modified by the insertion of transition metal atoms into the planar strontium layers, thus favoring strong indium-transition metal bonding.

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