The Solid Solution TmNi1–x–yIn1+x

2004 ◽  
Vol 59 (8) ◽  
pp. 893-897 ◽  
Author(s):  
Mar’yana Lukachuk ◽  
Yaroslav M. Kalychak ◽  
Rainer Pöttgen
Keyword(s):  
Solid Solution ◽  
Single Crystals ◽  
Solid Solutions ◽  
Chemical Bonding ◽  
Crystal Chemical ◽  
Arc Melting ◽  
Trigonal Prismatic Coordination ◽  
Trigonal Prismatic

AbstractThe thulium nickel indide TmNiIn forms solid solutions TmNi1−x−yIn1+x. Several samples have been prepared by arc-melting of the elements under argon. The structure of TmNiIn contains two crystallographically different nickel sites. The Ni1 atoms have a trigonal prismatic coordination by indium, while the Ni2 sites have six thulium neighbors in a trigonal prismatic arrangement. The Ni1 sites show defects in the solid solution, while the Ni2 sites have Ni2/In mixing with a maximal occupancy of 32 at.-% indium. The structures of three single crystals of solid solutions have been refined, leading to the compositions TmNi0.88In1.10 (a =747.06(7), c = 367.8(1) pm, wR2 =0.0342, 323 F2 values, 16 variables), TmNi0.80In1.16 (a= 752.94(7), c =366.5(1) pm, wR2=0.0475, 503 F2 values, 16 variables), and TmNi0.76In1.21 (a = 758.4(1), c = 366.68(7) pm, wR2 = 0.0949, 226 F2 values, 16 variables). The crystal chemical peculiarities and the differences in chemical bonding are briefly discussed.

New Indides Sc6Co2.18In0.82, Sc10Ni9In19.44 And Sccu4In – Synthesis, Structure, And Crystal Chemistry

2006 ◽  
Vol 61 (8) ◽  
pp. 942-948 ◽  
Author(s):  
Roman I. Zaremba ◽  
Yaroslav M. Kalychak ◽  
Ute Ch. Rodewald ◽  
Rainer Pöttgen ◽  
Vasyl’ I. Zaremba
Keyword(s):  
Three Dimensional ◽  
Cobalt Atom ◽  
Crystal Chemical ◽  
Single Crystal Diffraction ◽  
X Ray ◽  
Arc Melting ◽  
Dimensional Network ◽  
The Family ◽  
Trigonal Prismatic Coordination ◽  
Trigonal Prismatic

New indides Sc6Co2.18In0.82, Sc10Ni9In- and ScCu4In have been synthesized from the elements by arc-melting. Single crystals were grown by special annealing modes. The thee indides were investigated via X-ray powder and single crystal diffraction: Ho6Co2Ga type, Immm, a = 886.7(3), b = 878.0(2), c = 932.1(3) pm, wR2 = 0.0517, 711 F2 values, 35 variables for Sc6Co2.18In0.82, Ho10Ni9In20 type, P4/nmm, a = 1287.5(2), c = 884.7(1) pm, wR2 = 0.0642, 1221 F2 values, 63 variables for Sc10Ni9In19.44, and MgCu4Sn type, F ¯43m, a = 704.03(7) pm, wR2 = 0.0267, 101 F2 values, and 7 variables for ScCu4In. The scandium rich indide Sc6Co2.18In0.82 contains two Co2 dumb-bells at Co-Co distances of 221 and 230 pm. Each cobalt atom within these dumb-bells has a tricapped trigonal prismatic coordination. The In1 site has a distorted cube-like coordination by scandium and shows a mixed occupancy (36%) with cobalt. The In2 atoms have distorted icosahedral scandium coordination. As a consequence of the small size of the scandium atoms, the In4 site in Sc10Ni9In19.44 shows defects and was furthermore refined with a split model leading to a new distorted variant within the family of Ho10Ni9In20 compounds. ScCu4In is an ordered version of the cubic Laves phase with scandium and indium atoms in the CN16 voids of the copper substructure. The Cu-Cu distances within the three-dimensional network of corner-sharing tetrahedra are 248.6 and 249.2 pm. The crystal chemical peculiarities of these three indide structures are briefly discussed

On the Silicides EuIr2Si2 and Lu5Si3

2004 ◽  
Vol 59 (9) ◽  
pp. 969-974 ◽  
Author(s):  
Ute Ch. Rodewald ◽  
Birgit Heying ◽  
Dirk Johrendt ◽  
Rainer Pöttgen
Keyword(s):  
Single Crystal ◽  
Chemical Bonding ◽  
Induction Furnace ◽  
Three Dimensional ◽  
Single Crystal Diffraction ◽  
X Ray ◽  
Arc Melting ◽  
Sample Chamber ◽  
Trigonal Prismatic Coordination ◽  
Trigonal Prismatic

EuIr2Si2 was synthesized from the elements in a sealed tantalum tube in a water-cooled sample chamber of an induction furnace. Lu5Si3 was obtained by arc-melting of the elements. Both silicides were investigated by X-ray powder and single crystal diffraction: BaAl4 type, I4/mmm, a = 407.4(1), c = 1010.8(7) pm, wR2 = 0.0492, 134 F2 values, 9 variables for EuIr2Si2 and Mn5Si3 type, P63/mcm, a = 820.0(1), c = 614.2(1) pm, wR2 = 0.0511, 311 F2 values and 12 variables for Lu5Si3. The iridium and silicon atoms in EuIr2Si2 build up a three-dimensional [Ir2Si2] network with Ir-Si and Si-Si interactions. The europium atoms fill cages within the network. The metal-rich silicide Lu5Si3 contains columns of face-sharing, empty Lu6 octahedra and isolated silicon atoms in a distorted tri-capped trigonal prismatic coordination. Chemical bonding in these silicides is briefly discussed.

Sr4Pt10In21 – the first representative of the Ho4Ni10In21 type with a divalent cation

2019 ◽  
Vol 74 (5) ◽  
pp. 443-449 ◽  
Author(s):  
Birgit Heying ◽  
Jutta Kösters ◽  
Rainer Pöttgen
Keyword(s):  
Single Crystal ◽  
Single Crystals ◽  
Glassy Carbon ◽  
Divalent Cation ◽  
High Frequency ◽  
Three Dimensional ◽  
X Ray ◽  
Trigonal Prismatic Coordination ◽  
Trigonal Prismatic

AbstractRod-shaped single crystals of Sr4Pt10In21were prepared from the elements in glassy-carbon crucibles in a high-frequency furnace. The structure of Sr4Pt10In21was refined from single-crystal X-ray diffractometer data:C2/m, Ho4Ni10Ga21type,a = 2322.62(7),b = 450.27(2),c = 1958.09(7) pm,β = 133.191(3)°,wR = 0.0464, 3200F2values and 107 variables. The three-dimensional [Pt10In21]δ−polyanionic network is stabilized through substantial Pt–In (269–313 pm Pt–In) and In–In (294–362 pm In–In) bonding. All platinum atoms have slightly distorted tri-capped trigonal prismatic coordination and the two crystallographically independent strontium atoms are located in penta-capped pentagonal prisms.

scholarly journals Structure feature of ternary state diagrams of Cr-Ti-V and Cr-Mn-V systems

2018 ◽  
Vol 243 ◽  
pp. 00014 ◽  
Author(s):  
Anatoliy Klopotov ◽  
Irina Kurzina ◽  
Alexander Potekaev ◽  
Artem Ustinov ◽  
Taras Dement ◽  
...  
Keyword(s):  
Solid Solution ◽  
Intermetallic Compounds ◽  
Solid Solutions ◽  
Crystal Chemical ◽  
Electron Number ◽  
Isothermal Sections ◽  
State Diagrams ◽  
Bcc Lattice ◽  
Existence Domain ◽  
Chemical Factors

This paper presents the research results of features of structural and phase states in Cr-Ti-V and Cr-Mn-V systems based on analysis of crystal-geometric and crystal-chemical factors. The diagrams of isothermal sections of state diagrams of Cr-Ti-V and Cr-Mn-V systems were built in coordinates of the electron number (s+d) per atom with homogeneity regions of solid solutions and intermetallic compounds. It was shown that in the Cr-Ti-V system, addition of Mn atoms leads to substantial extension of the existence domain of the disordered solid solution based on the BCC lattice.

Condensed [Ru4Sn6] Units in the Stannides LnRu4Sn6 (Ln = La, Pr, Nd, Sm, Gd) - Synthesis, Structure, and Chemical Bonding

1999 ◽  
Vol 54 (7) ◽  
pp. 863-869 ◽  
Author(s):  
Markus F. Zumdick ◽  
Rainer Pöttgen
Keyword(s):  
Rare Earth ◽  
Single Crystals ◽  
Chemical Bonding ◽  
Melting Furnace ◽  
Structural Motif ◽  
X Ray Diffraction ◽  
X Ray ◽  
Arc Melting ◽  
First Time ◽  
Gadolinium Compound

The stannides LnRu4Sn6 (Ln = La, Pr, Nd, Sm, Gd) were prepared by reaction of the elements in an arc-melting furnace and subsequent annealing at 1120 K. The praseodymium, the neodymium, and the samarium stannide were obtained for the first time. The LnRu4Sn6 stannides were investigated by X-ray diffraction both on powders and single crystals. They adopt the YRu4Sn6 type structure which was refined from single crystal X-ray data for the samarium and the gadolinium compound: I4̄2m, a = 686.1 (1), c = 977.7(2) pm, wR2 = 0.0649, 483 F2 values for SmRu4Sn6, and a = 685.2(1), c = 977.6(3) pm, wR2 = 0.0629, 554 F2 values for GdRu4Sn6 with 19 variables for each refinement. The striking structural motif of these stannides are distorted RuSn6 octahedra with Ru-Sn distances ranging from 257 to 278 pm. Four of such octahedra are condensed via common edges and faces forming [Ru4Sn6] units which are packed in a tetragonal body-centered arrangement. The rare-earth atoms fill the voids between the [Ru4Sn6] units. Based on an extended Hückel calculation, strong bonding interactions were found for the Ru-Sn and the various Sn-Sn contacts.

ChemInform Abstract: Crystal Chemical Properties and Preparation of Single Crystals of AgGaSe2-GeSe2 γ-Solid Solutions.

ChemInform ◽  
2010 ◽  
Vol 27 (50) ◽  
pp. no-no
Author(s):  
I. D. OLEKSEYUK ◽  
A. V. GULYAK ◽  
L. V. SYSA ◽  
G. P. GORGUT ◽  
A. F. LOMZIN
Keyword(s):  
Single Crystals ◽  
Solid Solutions ◽  
Chemical Properties ◽  
Crystal Chemical

Crystal chemical properties and preparation of single crystals of AgGaSe2GeSe2 γ-solid solutions

1996 ◽  
Vol 241 (1-2) ◽  
pp. 187-190 ◽  
Author(s):  
I.D. Olekseyuk ◽  
A.V. Gulyak ◽  
L.V. Sysa ◽  
G.P. Gorgut ◽  
A.F. Lomzin
Keyword(s):  
Single Crystals ◽  
Solid Solutions ◽  
Chemical Properties ◽  
Crystal Chemical

scholarly journals Equiatomic iron-based tetrelides TFeSi and TFeGe (T = Zr, Nb, Hf, Ta) – A 57Fe Mössbauer-spectroscopic study

2019 ◽  
Vol 74 (2) ◽  
pp. 211-219 ◽  
Author(s):  
Sebastian Stein ◽  
Theresa Block ◽  
Steffen Klenner ◽  
Lukas Heletta ◽  
Rainer Pöttgen
Keyword(s):  
Room Temperature ◽  
Structural Motif ◽  
Clear Correlation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Arc Melting ◽  
Structural Distortions ◽  
Trigonal Prismatic Coordination ◽  
The Common ◽  
Trigonal Prismatic

AbstractThe equiatomic iron-silicides TFeSi as well as the corresponding germanides TFeGe with the electron-poor 4d and 5d transition metals (T=Zr, Nb, Hf, Ta) have been synthesized from the elements by arc-melting. All samples were characterized through their lattice parameters using powder X-ray diffraction (Guinier technique). Four structures were refined from single-crystal X-ray diffractometer data: a=640.16(3), b=393.45(5), c=718.42(6) pm, Pnma, 390 F2 values, 20 parameters, wR2=0.0294 for ZrFeSi (TiNiSi type), a=719.63(11), b=1119.27(7), c=649.29(7) pm, Ima2, 1103 F2 values, 54 parameters, wR2=0.0555 for NbFeGe (TiFeSi type), a=655.96(7), c=372.54(4) pm, P6̅2m, 251 F2 values, 15 parameters, wR2=0.0260 for HfFeGe (ZrNiAl type) and a=624.10(3), b=378.10(6), c=725.25(7) pm, Pnma, 369 F2 values, 20 parameters, wR2=0.0513 for TaFeGe (TiNiSi type). The common structural motif of the four different structures is the slightly distorted tetrahedral tetrel (tr) coordination of the iron atoms and a trigonal prismatic coordination of iron by T=Zr, Nb, Hf, Ta. Three compounds were characterized as Pauli-paramagnetic by measuring their susceptibility. The measurement of the electrical resistivity of NbFeSi characterises this compound as a good metal. Furthermore, 57Fe Mössbauer spectra of all compounds could be obtained at room temperature, revealing a clear correlation between the structural distortions and the quadrupole splitting parameters.

Monazite-huttonite solid-solutions from the Vico Volcanic Complex, Latium, Italy

1996 ◽  
Vol 60 (402) ◽  
pp. 751-758 ◽  
Author(s):  
Giancarlo Della Ventura ◽  
Annibale Mottana ◽  
Gian Carlo Parodi ◽  
Mati Raudsepp ◽  
Fabio Bellatreccia ◽  
...  
Keyword(s):  
Solid Solution ◽  
Distribution Pattern ◽  
Solid Solutions ◽  
Electron Probe ◽  
Divalent Cations ◽  
Volcanic Complex ◽  
Crystal Chemical ◽  
Space Group ◽  
Single Grain ◽  
Anionic Groups

AbstractThe crystal-chemical relationships occurring within a single grain of monazite-(Ce) from Vetralla, Vico Volcanic Complex, north of Rome, are outlined. The sample is from a miarolitic cavity in a holocrystalline ejectum consisting of K-feldspar plus minor plagioclase, mica and Fe-oxides, collected from a pyroclastic explosive level. The Gandolfi film (Cu-Kα radiation) can be indexed in space group P21/n with a = 6.816(4); b = 6.976(4); c = 6.471(3) Å; β = 103.63(3)°; V = 299.0(6) Å3. Electron-probe microanalyses plot within the field of monazite along the huttonite-monazite edge of the huttonite-monazite-brabantite triangle. Despite patchy and irregular zoning, the grain shows a clear enrichment towards pure monazite at the outer rim. A constant Th:Si ratio of 1:1 indicates the existence of a simple solid-solution between huttonite and monazite. The substitution can be written as Th4+ + Si4+ → REE3+ + P5+ without requiring any electrostatic compensation by divalent cations, or by anionic groups. The REE distribution pattern is compatible with that of monazites from syenitic rocks.

scholarly journals Chemical Polishig of CdTe and Solid Solution ZnxCd1-xTe and Cd0.2Hg0.8Te by the HNO3 – НІ – Glycerin Acid Aqueous Solutions

2017 ◽  
Vol 18 (1) ◽  
pp. 117-121
Author(s):  
E.E. Hvozdiyevskyi ◽  
R.O. Denysyuk ◽  
V.M. Tomashyk ◽  
Z.F. Tomashyk
Keyword(s):  
Experimental Data ◽  
Solid Solution ◽  
Aqueous Solutions ◽  
Dissolution Rate ◽  
Single Crystals ◽  
Solid Solutions ◽  
Etching Rate ◽  
Organic Content ◽  
Chemical Dissolution

The chemical dissolution of the CdTe, ZnxCd1-xTe and Cd0,2Hg0,8 solid solutions single crystals in the HNO3 – HI – glycerin aqueous solutions has been investigated. The etching rate dependences of the mentioned above materials versus the iodine and organic content in the compositions and the kinetic peculiarities of the chemical dissolution have been determined. It was established that the dissolution rate of the semiconductor solid solutions in the HNO3 – HI – glycerin etchant compositions decreases with the increasing of oxidizer and glycerin. Using experimental data, the compositions of polishing solutions and the conditions of chemical-dynamic polishing of the CdTe, ZnxCd1-xTe and Cd0,2Hg0,8Te surfaces have been optimized.

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