scholarly journals The Ti-Fe-P system: phase equilibria and crystal structure of phases

2013 ◽  
Vol 11 (9) ◽  
pp. 1518-1526 ◽  
Author(s):  
Oksana Toma ◽  
Mariya Dzevenko ◽  
Anton Oliynyk ◽  
Yaroslava Lomnytska
Keyword(s):  
Crystal Structure ◽  
Phase Equilibria ◽  
Stoichiometric Composition ◽  
P System ◽  
Single Crystal Diffraction ◽  
Space Group ◽  
X Ray ◽  
Type Space ◽  
Binary Compounds ◽  
System Phase

AbstractAbstract Phase equilibria was investigated in the Ti-Fe-P system at T = 1070 K in the region 0–67 at.% of P, employing X-ray powder diffraction. The two ternary compounds, namely Ti0.5–0.8Fe1.5−1.2P (Co2Si-type; space group Pnma; a = 0.5964(2)–0.6011(3), b = 0.3575(3)–0.3600(1), c = 0.6828(2)–0.6882(2) nm) and Ti0.85−1.25Fe1.15−0.75P (ZrNiAl-type; space group P-62m; a = 0.6071(4)–0.6117(1), c = 0.3510(9)–0.3506(1) nm) exist in the Ti-Fe-P system at this temperature. The crystal structure of the Ti0.85–1.25Fe1.15−0.75P compound was additionally determined by X-ray single crystal diffraction on the phase with stoichiometric composition. The substitutions of Ti by Fe were observed for Ti5P3.16, Ti3P and TiP phases, and Fe for Ti in the case of Fe3P, Fe2P binary compounds. Graphical abstract

Crystal Structure of the Dy3Ni11.83Si3.98 Compound

2019 ◽  
Vol 289 ◽  
pp. 77-81
Author(s):  
Bohdana Belan ◽  
Mykola Manyako ◽  
Katarzyna Pasinska ◽  
Marta Demchyna ◽  
Roman E. Gladyshevskii
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Large Family ◽  
Type Structure ◽  
Single Crystal Diffraction ◽  
Space Group ◽  
X Ray ◽  
Arc Melting ◽  
Pearson Symbol ◽  
Ternary Silicide

The new ternary silicide Dy3Ni11.83(1)Si3.98(1)was synthesized from the elements by arc-melting and its crystal structure was determined by X-ray single-crystal diffraction. The compound crystallizes in a Sc3Ni11Ge4-type structure: Pearson symbolhP38, space groupP63/mmc(No. 194),a= 8.1990(7),c= 8.6840(7) Å,Z= 2;R= 0.0222, wR= 0.0284 for 365 reflections. The structure belongs to a large family of structures related to the EuMg5.2type, with representatives among ternary aluminides, silicides, germanides,etc.

La6C2Br9: La-Tetraederdoppel mit endohedralen C4–-Ionen / La6C2Br9: La Bitetrahedral Clusters with Endohedral C4− Ions

2007 ◽  
Vol 62 (2) ◽  
pp. 143-147 ◽  
Author(s):  
Hansjürgen Mattausch ◽  
Constantin Hoch ◽  
Arndt Simon
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Molar Ratio ◽  
Single Crystal Diffraction ◽  
Space Group ◽  
X Ray

Monophasic La6C2Br9 was prepared by heating a mixture of LaBr3, lanthanum metal and carbon in a molar ratio of 3 : 3 : 2 at 840 °C for 5 d. The crystal structure was investigated by X-ray single crystal diffraction (space group C2/c, a = 14.234(3), b = 10.858(2), c = 14.588(3) Å , β = 106.80(3) °). In the structure the La atoms form edge-sharing double tetrahedra. The La tetrahedra are centered by single carbon atoms. The yellow crystals of La6C2Br9 are transparent and electrically insulating.

Boron-Carbon Order and Symmetry Control: Single-Crystal X-Ray Study of SmB2C2

2006 ◽  
Vol 61 (6) ◽  
pp. 727-732 ◽  
Author(s):  
Volodymyr Babizhetskyy ◽  
Constantin Hoch ◽  
Hansjürgen Mattausch ◽  
Arndt Simon
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Title Compound ◽  
Single Crystal Diffraction ◽  
Space Group ◽  
X Ray ◽  
Arc Melting ◽  
Boron Carbon

The title compound was prepared from the elements by arc-melting followed by annealing in silica tubes at 1270 K for one week. The crystal structure was investigated by means of X-ray single crystal diffraction: space group P4/mbm, a = 5.366(1), c = 3.690(1) Å , Z = 2, R1 = 0.010, wR2 = 0.022 for 245 unique reflections with Io > 2σ (Io) and 12 refined parameters. Group-subgroup relationships of MB6 and MB2C2 structure models are discussed

Crystal structure of Al5O3N3 (15R)

2017 ◽  
Vol 32 (S1) ◽  
pp. S2-S5 ◽  
Author(s):  
Jacek Podwórny ◽  
Alicja Pawełek ◽  
Jerzy Czechowski
Keyword(s):  
Crystal Structure ◽  
Structure Determination ◽  
Structural Model ◽  
Stoichiometric Composition ◽  
Unit Cell ◽  
Second Phase ◽  
Space Group ◽  
X Ray ◽  
Cell Dimensions ◽  
Unit Cell Dimensions

Having synthesised an AlON-bonded ceramic corundum material, Al5O3N3 (15R) polytype coexisting with α-Al2O3 was identified. The sample was prepared from an alumina-rich mixture of Al2O3 and AlN substrates and fired at 1650 °C in a nitrogen atmosphere. Using the X-ray external standard quantitative method, one of the reaction products, α-Al2O3, was quantified. From the remaining substrates the stoichiometric composition of the second phase was calculated. The applied method of crystal structure determination consisted of three stages. In the first stage, the Le Bail method of X-ray pattern decomposition was used for the extraction of Al5O3N3 (15R) diffraction lines from a two-phase diffractogram. The space group and unit-cell dimensions from the isostructural SiAl4O2N4 SiAlON phase, producing the same X-ray pattern, were used as input data. Next, the direct structure determination in real space was applied for initial structural model derivation, which was followed by Rietveld refinement. The solved crystal structure of Al5O3N3 (15R), except the stacking sequence, proved to be closely related to the structure of Al7O3N5 (21R) polytype. The Al5O3N3 (15R) is trigonal with space group R-3m, unit-cell dimensions a0 = 3.0128 Å, c0 = 41.8544 Å, and volume V = 329.00 Å3. The model of Al5O3N3 (15R) polytype structure has positional disordering in one of three (6c) Al sites, which leads to stacking faults in six tetrahedral layers. Every third tetrahedron from LR3 and LR4, LR8 and LR9, LR13 and LR14 layers is rotated by 180°.

Pr2CBr: Ein Ferromagnet mit Pr2C-Schichten/ Pr2CBr: A Ferromagnet with Pr2C Layers

2009 ◽  
Vol 64 (4) ◽  
pp. 371-374 ◽  
Author(s):  
Hansjürgen Mattausch ◽  
Reinhard K. Kremer ◽  
Arndt Simon
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Single Phase ◽  
Single Crystal Diffraction ◽  
Space Group ◽  
Metallic Conductivity ◽  
X Ray ◽  
Trigonal Prismatic

Single-phase Pr2CBr was prepared by heating a mixture of PrBr3, Pr and C (1 : 5:3) to 1140 °C for 18 d. The crystal structure was investigated by X-ray single crystal diffraction (space group P63/mmc, a = 3.8071(3), c = 14.7787(12) Å). In the structure the Pr atoms form C-centered octahedra condensed into Pr2C sheets via common edges; these sheets are separated by the Br atoms which are in a trigonal prismatic environment of Pr atoms. Pr2CBr is a black shiny compound with metallic conductivity. It is a ferromagnet with Tc = 13.8(5) K.

The Crystal Structure of GdZn3

2013 ◽  
Vol 68 (11) ◽  
pp. 1265-1268 ◽  
Author(s):  
Inna Bigun ◽  
Yaroslav M. Kalychak
Keyword(s):  
Crystal Structure ◽  
Coordination Number ◽  
Diffraction Data ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
Type Space ◽  
Dimensional Network

The crystal structure of GdZn3 was refined using singlecrystal X-ray diffraction data: YZn3 type, space group Pnma, Z = 4, a = 6:7250(13), b = 4:4620(9), c = 10:201(2) Å , R1 = 0:049, wR2 = 0:082, 303 F2 values, 25 variables. The zinc atoms build up a three-dimensional network with short Zn-Zn distances, while the Gd atoms are well separated from each other. The coordination number is 17 for Gd, and 10 and 12 for the Zn atoms.

scholarly journals Interaction of Components in the Lu-Ag-Si System at 500 ºC

2021 ◽  
Vol 22 (1) ◽  
pp. 88-93
Author(s):  
B. Belan ◽  
M. Dzevenko ◽  
M. Daszkiewicz ◽  
R. Gladyshevskii
Keyword(s):  
Crystal Structure ◽  
Isothermal Section ◽  
Binary Compound ◽  
Type Structure ◽  
Single Crystal Diffraction ◽  
X Ray ◽  
Substitution Type ◽  
Edx Analyses ◽  
Interaction Of Components ◽  
Binary Compounds

Isothermal section of the Lu-Ag-Si system at 500ºC was studied by means of X-ray powder diffraction, microstructure and EDX-analyses in the whole concentration range. The existence of earlier reported binary compounds LuAg4, LuAg2, LuAg and LuSi2, LuSi, Lu5Si3, Lu5Si4 was confirmed. New binary compound Lu3Si5 (own str. type) was found. Almost none of the binary silicides dissolve more than 5 at.% of third component. The exception is the existence of the substitution type solid solutions based on LuAg2 (MoSi2-type structure), which dissolves up to 20 at.% Si, as well as on Lu5Si3 (Mn5Si3-type structure), which dissolves up to 15 at.% Ag. The crystal structure of the LuSi compound was redetermined by X-ray single crystal diffraction (TlI-type, space group Cmcm, a = 4.1493(3), b = 10.2641(7), c = 3.7518(2) Å, R = 0.0173, wR = 0.0415 for 173 independent reflections). No ternary compound is observed in the Lu-Ag-Si system.

Kristallstruktur von K4O(CN)2 / Crystal Structure of K4O(CN)2

1992 ◽  
Vol 47 (12) ◽  
pp. 1746-1748 ◽  
Author(s):  
Christian Hardt ◽  
Petra Vogt ◽  
Horst Sabrowsky
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Structure Type ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
Type Space

Colorless K4O(CN)2 has been prepared. The compound crystallizes in the tetragonal anti-K2NiF4 structure type (space group I4/mmm) with a = 515.5(1) and c = 1606.7(3) pm, Z = 2. The structure was determined by single crystal X-ray diffraction, R = 3.35%.

Synthesis and Crystal Structure of 1-(2R,3S,4R,5R)-3-fluoro-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-5-iodopyrimidine-2,4(1H,3H)-dione

2014 ◽  
Vol 997 ◽  
pp. 196-199
Author(s):  
Wei Li ◽  
Qiang Xiao ◽  
Ru Chun Yang
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Title Compound ◽  
Nmr Spectra ◽  
Crystal Data ◽  
Single Crystal Diffraction ◽  
Monoclinic System ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
X Ray

The title compound, 1-(2R,3S,4R,5R)-3-fluoro-4-hydroxy-5-(hydroxymethyl) tetrahydrofuran-2-yl)-5-iodopyrimidine-2,4(1H,3H)-dione , C9H10FIN2O5, as potential drugs for anti-tumor, anti-viral have been synthesized and characterized by NMR spectra. Meanwhile, the crystal of 2b was obtained and determined by X-ray single-crystal diffraction. Crystal data: monoclinic system, space group P2(1),a= 9.0832(11) Ǻ,b= 5.4332(7) Ǻ,c= 12.2464(15) Ǻ,β= 107.809(4)°,V= 575.41(12) Ǻ3,Z= 2,F(000) = 360,Dx= 2.148 Mg m-3,μ= 2.813 mm-1,R= 0.014 andwR= 0.056 for 1988 independent reflections (Rint= 0.0209) and 1932 observed ones (I > 2σ (I)).

Crystal structure of an inclusion complex between chiral monoaza-15-crown-5 and S(–)-1-phenyl-ethyl ammonium percholorate

2003 ◽  
Vol 218 (5) ◽  
Author(s):  
Süheyla Özbey ◽  
F. B. Kaynak ◽  
M. Toğrul ◽  
N. Demirel ◽  
H. Hoşgören
Keyword(s):  
Crystal Structure ◽  
Inclusion Complex ◽  
Single Crystal ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
New Type

AbstractA new type of inclusion complex, S(–)-1 phenyl ethyl ammonium percholorate complex of R-(–)-2-ethyl - N - benzyl - 4, 7, 10, 13 - tetraoxa -1- azacyclopentadecane, has been prepared and studied by NMR, IR and single crystal X-ray diffraction techniques. The compound crystallizes in space group

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