Zur Kenntnis quaternärer Telluride Cu2MM′Te4 mit Tetraederstrukturen / Quaternary Tellurides Cu2MM′Te4 with Tetrahedral Structures

1991 ◽  
Vol 46 (8) ◽  
pp. 1049-1052 ◽  
Author(s):  
H. Haeuseler ◽  
F. W. Ohrendorf ◽  
M. Himmrich
Keyword(s):  
Solid State ◽  
Type Structure ◽  
Solid State Reactions ◽  
X Ray

Quaternary tellurides Cu2MM′Te4 (M = Zn, Cd, Hg and M′ = Si, Ge, Sn) have been prepared by solid state reactions and characterized by X-ray powder methods. All 9 compounds crystallize in a stannite type structure.

Neue Verbindungen Ag2HgMX4 mit Wurtzstannitstruktur / New Compounds Ag2HgMX4 with the Wurtzstannite Type Structure

1989 ◽  
Vol 44 (9) ◽  
pp. 1035-1036 ◽  
Author(s):  
H. Haeuseler ◽  
M. Himmrich
Keyword(s):  
Solid State ◽  
Type Structure ◽  
Solid State Reactions ◽  
Similar Composition ◽  
X Ray ◽  
Unknown Structure ◽  
New Compounds

Three new compounds, Ag2HgGeS4, Ag2HgSnS4, and Ag2HgSnSe4, crystallizing in the wurtzstannite type structure have been prepared by solid state reactions at 700°C and characterized by X-ray powder methods. A fourth compound of similar composition Ag2HgGeSe4, with an hitherto unknown structure crystallizes cubically with a = 10.796 A.

ZrCuSiAs-type Phosphide Oxides: TbRuPO, DyRuPO, the Series LnOsPO (Ln = La, Ce, Pr, Nd, Sm), and ThAgPO

2008 ◽  
Vol 63 (8) ◽  
pp. 934-940 ◽  
Author(s):  
Wolfgang Jeitschko ◽  
Barbara I. Zimmer ◽  
Robert Glaum ◽  
Ludger Boonk ◽  
Ute Ch. Rodewald
Keyword(s):  
Phase Transitions ◽  
Solid State ◽  
Single Crystal ◽  
Chemical Bonding ◽  
Large Family ◽  
Type Structure ◽  
Solid State Reactions ◽  
X Ray ◽  
History Of ◽  
High Transition

The title compounds were prepared by solid-state reactions and via tin and NaCl/KCl fluxes. They crystallize with the tetragonal ZrCuSiAs-type structure (P4/nmm, Z = 2), which was refined from single-crystal X-ray data of PrOsPO (a = 402.1(1), c = 824.0(1) pm, wR2 = 0.0490, 365 F2) and ThAgPO (a = 396.1(1), c = 877.8(1) pm, wR2 = 0.0307, 314 F2). They belong to a large family of isotypic compounds, of which several, mainly fluorine doped, iron containing compounds LnFeAsO1-xFx were discovered to be superconducting with relatively high transition temperatures only recently in other laboratories. Chemical bonding in these compounds is briefly discussed, and the importance of the weakly bonding Fe-Fe interactions for the phase transitions and the superconductivity is emphasized from the viewpoint of structural chemistry. A brief account of the history of the preparation of these compounds in our laboratory is given. Originally many of these compounds were obtained only in small amounts as byproducts in the course of the preparation of ternaries.

TEM studies of solid-state reactions in sputter-deposited Nb/Al multilayer thin films

1996 ◽  
Vol 54 ◽  
pp. 1020-1021
Author(s):  
F. Ma ◽  
S. Vivekanand ◽  
K. Barmak ◽  
C. Michaelsen
Keyword(s):  
Thin Films ◽  
Solid State ◽  
Stoichiometric Composition ◽  
Analytical Electron Microscopy ◽  
Grain Structure ◽  
Solid State Reactions ◽  
Multilayer Thin Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sputter Deposited

Solid state reactions in sputter-deposited Nb/Al multilayer thin films have been studied by transmission and analytical electron microscopy (TEM/AEM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD). The Nb/Al multilayer thin films for TEM studies were sputter-deposited on (1102)sapphire substrates. The periodicity of the films is in the range 10-500 nm. The overall composition of the films are 1/3, 2/1, and 3/1 Nb/Al, corresponding to the stoichiometric composition of the three intermetallic phases in this system.Figure 1 is a TEM micrograph of an as-deposited film with periodicity A = dA1 + dNb = 72 nm, where d's are layer thicknesses. The polycrystalline nature of the Al and Nb layers with their columnar grain structure is evident in the figure. Both Nb and Al layers exhibit crystallographic texture, with the electron diffraction pattern for this film showing stronger diffraction spots in the direction normal to the multilayer. The X-ray diffraction patterns of all films are dominated by the Al(l 11) and Nb(l 10) peaks and show a merging of these two peaks with decreasing periodicity.

scholarly journals Zur Kenntnis eines Barium-Oxoniobat-Tellurats: Ba2Nb2TeO10 / On a Barium-Oxoniobate-Tellurate: Ba2Nb2TeO10

1996 ◽  
Vol 51 (10) ◽  
pp. 1407-1410 ◽  
Author(s):  
B. Wedel ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Single Crystals ◽  
Solid State Reactions ◽  
Orthorhombic Symmetry ◽  
X Ray ◽  
Lattice Constants ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of Ba2Nb2TeO10) have been prepared by solid state reactions in air. X-ray investigations led to orthorhombic symmetry, space group D152h-Pbca, a = 7.242(4), b = 12.433(3), c = 9.932(3) Å. Z = 4. Nb5+ and Te6+ show octahedral coordination by O2- . The crystal structure is characterized by planes of edge- and corner-sharing NbO6- and TeO6octahedra. It is shown that in spite of nearly identical lattice constants of Ba2Nb2TeO10 with compounds of the composition M0,5BaNbTe2O9 the so far unknown crystals of these substances may not be derived from the Ba2Nb2TeO10 type.

Synthese und Struktureines Strontium-Vanadyl-Phosphats: Sr2(VO)(PO4)2 / Synthesis and Structure of a Strontium Vanadyl Phosphate: Sr2(VO)(PO4)2

1996 ◽  
Vol 51 (7) ◽  
pp. 929-933 ◽  
Author(s):  
C. Wadewitz ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Solid State ◽  
Solid State Reactions ◽  
Vanadyl Phosphate ◽  
Monoclinic Symmetry ◽  
X Ray ◽  
Vanadyl Group ◽  
Dark Green ◽  
Symmetry Space ◽  
Oxygen Distance ◽  
Symmetry Space Group

Dark green single crystals of Sr2(VO)P2O8 have been prepared by solid state reactions in closed quartz tubes. X-ray investigations led to monoclinic symmetry, space group C2h6-I2/a, a = 6.744(4), b = 15.866(4), c = 7.032(2) Å, β = 115.41(2), Z = 4. Sr2(VO)P2O8 is isotypic to Sr2(VO)V2O8 and shows V4+ in split positions. The split positions are in non-centric octahedral coordination forming a short vanadium to oxygen distance typical for the vanadyl group. The crystal chemistry of the monovanadyl orthophate Sr2(VO)P2O8 is discussed considering related divanadyl phosphates.

Structural and Concentration Heterogeneities during Formation of Silicide Phases in the Thin Film System Ti(5nm)/Ni(24nm)/Si(001)

2013 ◽  
Vol 344 ◽  
pp. 79-84
Author(s):  
S.I. Sidorenko ◽  
S.M. Voloshko ◽  
Yu.M. Мakogon ◽  
O.P. Pavlov ◽  
I.E. Kotenko ◽  
...  
Keyword(s):  
Thin Film ◽  
Mass Spectrometry ◽  
Solid State ◽  
Auger Spectroscopy ◽  
Solid State Reactions ◽  
Layer By Layer ◽  
Film System ◽  
X Ray ◽  
Thin Film System ◽  
Secondary Ions

By the methods of Auger-spectroscopy and mass-spectrometry of secondary ions, small-angle electron diffraction, X-ray and resistometry analyses the solid-state reactions in the Ti(5 nm)/ Ni(24 nm)/Si(001) thin film system at annealing in running nitrogen in the temperature interval of 723 – 1273 К are investigated. Regularities of phase transformations, consistency of solid-state reactions, layer-by-layer redistribution of components during annealing, features of surface morphology during formation of inclusions of silicide phases are established.

Fabrication of PbO-Type Structure β-FeSe Superconductor Ceramics by Solid State Reaction Method

2013 ◽  
Vol 790 ◽  
pp. 21-24
Author(s):  
Yun Yi Wu ◽  
Jian Gao ◽  
Tao Li ◽  
Zhi Qiang Hua
Keyword(s):  
Solid State ◽  
High Vacuum ◽  
Secondary Phase ◽  
Vacuum State ◽  
Type Structure ◽  
X Ray Diffraction ◽  
Solid State Sinter ◽  
Metallic Behavior ◽  
X Ray ◽  
Sinter Method

PbO-type structure β-FeSe superconductor ceramic were successfully prepared by solid state sinter method in high vacuum state. The structures of the ceramics were investigated by X-ray diffraction and scanning electron microscopy. X-ray diffraction indicates that the sample prepared by two-steps method exhibited a much improved crystallinity. And as sintering temperature increases to 700°C, secondary phase Fe7Se8 phase peak disappear and α-Fe peak weakened. Besides, the ceramic prepared in 700°C exhibited a denser surface morphology in comparison to that prepared in 410°C and its composition is closer to the chemical formula FeSe according to EDX compositional analyses. It was noted that the resistivity of the sample, sintered at 700°C using two-steps sinter method, shows a linear metallic behavior from room temperature and onset is around T = 7.5 K.

scholarly journals Advanced Research of the Triassic Clay from the Baltic Region

2012 ◽  
Vol 51 (4) ◽  
pp. 376-382
Author(s):  
J. Karasa ◽  
J. Kostjukovs ◽  
A. Palaša ◽  
A. Actiņš
Keyword(s):  
Solid State ◽  
Quantitative Determination ◽  
Organic Molecules ◽  
Clay Fraction ◽  
Solid State Reactions ◽  
Baltic Region ◽  
X Ray ◽  
Smectite Clays ◽  
The Baltic

A procedure of smectite containing clay enrichment has been optimized, and the process of sedimentation has been studied. The new enrichment based method for quantitative determination of clay fraction in smectite containing sediment was developed. A new method for obtaining organoclays from enriched smectite clays has been investigated. The method is based on solid-state reaction between smectite and organic compounds, where organic molecules can be intercalated in dried clay mineral (montmorillonite) by solid-state reactions, without or with use of solvents. The enriched clay and the obtained organoclay samples were characterized with X-ray powder diffraction (PXRD).

Dicobaltoarsenat -(CoAsO7) -Baugruppen im Cobaltoxid-Tellurat Co6O2[T eO4(CoAsO5)2] / Dicobaltoarsenate - (CoAsO7) - Groups in the Cobalt Oxide Tellurate Co6O2[TeO4(CoAsO5)2]

1997 ◽  
Vol 52 (5) ◽  
pp. 643-646 ◽  
Author(s):  
M. Staack ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Solid State ◽  
Single Crystal ◽  
Cobalt Oxide ◽  
Structure Type ◽  
Solid State Reactions ◽  
Orthorhombic Symmetry ◽  
X Ray ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract The compound Co6O2 [TeO4(CoAsO5)2] has been prepared by solid state reactions. Single crystal X -ray techniques led to orthorhombic symmetry, space group D 182h-Cmca, a = 6.020(1), b = 23.763(5), c = 8.841(2) Å , Z = 4. The new structure type contains the hitherto unknown cobaltoarsenate group CoAsO7, oxidic oxygen connected exclusively to cobalt, and TeO6 octahedra.

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