CsNaTe - Darstellung und Charakterisierung von Cäsiumnatriumtellurid / CsNaTe - Preparation and Characterization of Cesium Sodium Telluride

1996 ◽  
Vol 51 (4) ◽  
pp. 605-606 ◽  
Author(s):  
Karsten Fischer ◽  
Elisabeth Feldbaum-Möller ◽  
Petra Vogt ◽  
Volker Winter ◽  
Horst Sabrowsky
Keyword(s):  
Structure Type ◽  
X Ray ◽  
Tetragonal Lattice ◽  
Dark Green

Abstract The dark green compound CsNaTe has been prepared. The characterization by X-ray powder methods leads to a tetragonal lattice (P4/nmm) with a = 530.8 (4), c = 853.2 (1) pm and Z = 2. The structure ist related to the PbFCl structure type.

Synthesis and Characterization of the First 1:2 Ordered Perovskite Ruthenate

2002 ◽  
Vol 718 ◽  
Author(s):  
Job Rijssenbeek ◽  
Sylvie Malo ◽  
Takashi Saito ◽  
Vincent Caignaert ◽  
Masaki Azuma ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Neutron Diffraction ◽  
Structure Type ◽  
Synthesis And Characterization ◽  
Neutron Diffraction Data ◽  
X Ray ◽  
Relationship Of ◽  
The Relationship ◽  
Perovskite Lattice

AbstractPerovskite-like mixed metal ruthenates are of interest owing to their varied electronic and magnetic properties, which are heavily dependent on the ordering of the transition metals. We report the synthesis and structural characterization of the first 1:2 ordered perovskite ruthenate, Sr3CaRu2O9. The structure was determined from a combination of powder X-ray, electron and neutron diffraction data and is characterized by a 1:2 ordering of Ca2+ and Ru5+ over the sixcoordinate B-sites of the perovskite lattice. Sr3CaRu2O9 is the first example of this structure-type to include a majority metal with d electrons (Ru(V), d3). The relationship of this material to the K2NiF4-type Sr1.5Ca0.5RuO4 (i.e., Sr3CaRu2O8) highlights the dramatic effects of the ruthenium valence on the resultant structure. Remarkably, these two structures can be quantitatively interconverted by the appropriate choice of reaction temperature and atmosphere.

Synthesis, Structure and Magnetic Characterization of a New Phosphate K1.84Fe1.42Nb0.58(PO4)3 with the Langbeinite- type Structure

2008 ◽  
Vol 63 (3) ◽  
pp. 345-348 ◽  
Author(s):  
Artem A. Babaryk ◽  
Igor V. Zatovsky ◽  
Nikolay S. Slobodyanik ◽  
Ivan V. Ogorodnyk
Keyword(s):  
Crystal Structure ◽  
Low Temperatures ◽  
Structure Type ◽  
The Self ◽  
Magnetic Characterization ◽  
X Ray ◽  
Complex Phosphate ◽  
Cubic System ◽  
The Relationship

A new complex phosphate K1.84Fe1.42Nb0.58(PO4)3 has been synthesized by the self-flux technique. The X-ray single crystal structure and magnetic properties were studied. The compound crystallizes in the cubic system with space group P213 (a = 9.9404(10) Å ) and belongs to the langbeinite structure type. The structure contains [M2P3O18] building units. “Closed” fragments [M8P9O60] provide space for location of two potassium atoms. Antiferromagnetic interactions were detected at low temperatures which originate from superexchange through a M(1)-O-P-O-M(2) pathway with corresponding J = −5.5(1) cm−1. The relationship between the UV/vis absorption and the structure is discussed.

Synthesis and Structural Characterization of Ca14NbxIn1-xAs11 (x ≈ 0.85)

2016 ◽  
Vol 257 ◽  
pp. 147-151 ◽  
Author(s):  
Yi Wang ◽  
Svilen Bobev
Keyword(s):  
Physical Properties ◽  
Side Reaction ◽  
Structure Type ◽  
Major Product ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ongoing Work ◽  
Set Up

Single-crystals of the new compound Ca14NbxIn1–xAs11 have been obtained from a solid-state reaction in a sealed Nb ampoule. The initial experiment had been set up with the aim to investigate the effect of electron doping (via In) on the crystal structure and physical properties of Ca14MnAs11. Subsequent single-crystal X-ray diffraction and elemental analysis work suggested that instead of Ca14MnxIn1–xAs11, the major product of the reaction is the phase Ca14NbxIn1–xAs11. This supposition was corroborated when the title compound was synthesized from a reaction of Ca, In and As in a sealed Nb ampoule, proving that, 1) Mn metal is not included in the structure, and 2) that the inadvertent side reaction of As with the walls of the Nb container is the source of the niobium. The overall structure is isotypic with the tetragonal Ca14AlSb11 structure type (space group I41/acd), although some marked differences between the two must be noted. Current ongoing work is focused on the synthesis of phase pure polycrystalline samples and determination of the physical properties of this unusual transition metal Zintl phase.

scholarly journals Synthesis and superstructural characterization of Fe1.89Mo4.11O7

1994 ◽  
Vol 9 (4) ◽  
pp. 891-897 ◽  
Author(s):  
George L. Schimek ◽  
Robert E. McCarley ◽  
L. Scott Chumbley
Keyword(s):  
Structure Type ◽  
Tetrahedral Coordination ◽  
X Ray Diffraction ◽  
Cation Site ◽  
X Ray ◽  
Transmission Electron ◽  
The Family ◽  
Regular Arrangement ◽  
Cation Sites

Superstructuring in the new compound Fe1.89Mo4.11O7 has been elucidated by transmission electron microscopy. This compound is a member of the family M2MO4O7 and has both iron and molybdenum atoms occupying octahedrally coordinated sites in the structure, represented by Fet(Fe0.89M0.11)0Mo4O7. The superstructuring, detected only by electron diffraction, involved tripling of all three lattice parameters of the subcell. The subcell was structured by single crystal x-ray diffraction [Imma, no. 74, a = 5.9793(5) Å, b = 5.7704(4) Å, and c = 17.036(1) Å]. This structure type contains a close-packed arrangement of Mo4O7 units, which are infinite chains of trans edge-shared molybdenum octahedra running parallel to b*. Two different coordination environments are observed for the cations. Parallel to the a* direction, infinite edge-sharing MO6 (M = 89% Fe or 11% Mo) octahedra are observed. The second cation site, with nearly tetrahedral coordination by oxygen, is filled solely by iron. The superstructure can be rationalized by a regular arrangement of iron and molybdenum atoms in the octahedrally coordinated cation sites.

scholarly journals Notizen: CsNaS - das erste Interalkalimetallsulfid mit Cäsium / CsNaS - the First Inter Alkali Metal Sulfide with Cesium

1993 ◽  
Vol 48 (12) ◽  
pp. 1839-1840 ◽  
Author(s):  
Horst Sabrowsky ◽  
Elisabeth Feldbaum-Möller ◽  
Volker Winter ◽  
Petra Vogt
Keyword(s):  
Alkali Metal ◽  
Metal Sulfide ◽  
Structure Type ◽  
X Ray ◽  
Tetragonal Lattice

The grey compound CsNaS has been prepared. The characterization by X-ray powder methods leads to a tetragonal lattice (P 4/nmm) with a = 482.1(1), c = 785.6(2) pm and Z = 2. The structure is related to the PbFCl structure type.

Structural Systematics of Rare Earth Complexes. III. Structural Characterization of Lanthanoid(III) Picrate Hydrates: Gadolinium Picrate Dodecahydrate—an X-Ray-Induced Phase Modification?—and Some General Aspects of the Structural Chemistry of Lanthanoid Picrates

1994 ◽  
Vol 47 (2) ◽  
pp. 349 ◽  
Author(s):  
JM Harrowfield ◽  
WM Lu ◽  
BW Skelton ◽  
AH White
Keyword(s):  
Rare Earth ◽  
Data Collection ◽  
Structure Type ◽  
Data Sets ◽  
Fresh Sample ◽  
X Ray ◽  
Phase Modification ◽  
General Aspects

In the course of the studies described in Parts I and II, an unusual result was observed in the case of the structure determination of hydrated gadolinium(III) picrate. Midway through data collection, the monoclinic P 21/c phase underwent a phase modification (X-ray-induced?) to a similar cell more nearly resembling that of the La → Pr structure type recorded previously, with no loss of crystal integrity, and with useful data sets being obtained on both forms. Redetermination of the structure with a fresh sample yielded no reproduction of the anomaly. These results are recorded and discussed, together with an overview of the consequences of the data of Parts I-III in relation to those of other literature in the field.

scholarly journals Synthesis and Characterization of Niobium and Tungsten Substituted VOPO4

2019 ◽  
Vol 43 (1) ◽  
pp. 31-37
Author(s):  
Subrata Chandra Roy ◽  
Lilufer Yeasmin ◽  
Mahmadur Rahman
Keyword(s):  
Solid Solution ◽  
Magnetic Property ◽  
Structure Type ◽  
Synthesis And Characterization ◽  
Solution Combustion ◽  
X Ray ◽  
Unknown Phase ◽  
Academy Of Sciences ◽  
Combustion Technique

Tungsten and Niobium substituted αII-VOPO4 structure type solid solution (V1–x-yWxNby) OPO4 where x = 0.07 and y ≤ 0.05 was synthesized by solution combustion technique followed by heating in air at 700˚C for 3 days. Further incorporation of niobium (y > 0.05) leads to a mixture of αII-VOPO4 structure type solid solution and two very weak reflections of another unknown phase. The synthesized product was characterized by X-ray powder diffraction, SEM/EDX, FTIR, and magnetic property analysis. Journal of Bangladesh Academy of Sciences, Vol. 43, No. 1, 31-37, 2019

A Modulation Wave Approach to the Structural Characterization of Three New Cristobalite-Related Sodium Magnesiosilicates

1997 ◽  
Vol 53 (2) ◽  
pp. 203-220 ◽  
Author(s):  
R. L. Withers ◽  
C. Lobo ◽  
J. G. Thompson ◽  
S. Schmid ◽  
R. Stranger
Keyword(s):  
Powder Diffraction ◽  
Structural Characterization ◽  
Diffraction Data ◽  
Structure Type ◽  
Powder Diffraction Data ◽  
X Ray ◽  
Modulation Wave ◽  
Wave Approach ◽  
The Ideal

The crystal structures of three new cristobalite-related sodium magnesiosilicates [Na2MgSiO4, M r = 162.37, orthorhombic, Pna21, a = 10.835 (5), b = 5.279 (12), c = 7.067 (8) Å, D x = 2.668 g cm−3, Z = 4, Cu Kα, λ = 1.5418 Å, μ = 75.96 cm−l, F(000) = 319.87; Na1.74Mg0.79Al0.15Si1.06O4, M r = 157.02, orthorhombic, Pbca, a = 10.487 (7), b = 14.351 (4), c = 5.243 (6) Å, D x = 2.643 g cm−3, Z = 8, Cu Kα, λ = 1.5418 Å, μ = 76.70 cm−l, F(000) = 619.04; Na1.8Mg0.9Si1.1O4, M r = 158.15, tetragonal, P41212, a = 5.330 (6), c = 7.086 (5) Å, D x = 2.609 g cm−3, Z = 2, Cu Kα, λ= 1.5418 Å, μ = 75.44 cm−l, F(000) = 155.94] are determined by Rietveld refinement from X-ray powder diffraction data. Plausible starting models were derived from a modulation wave approach based on the ideal C9 structure type and assuming regular SiO4 and MgO4 tetrahedra.

Crystallinity Studies of GaN/Si Films Grown by MOCVD at Various Substrate Temperatures Using XRD

2006 ◽  
Vol 517 ◽  
pp. 69-72
Author(s):  
Sha Shiong Ng ◽  
Hassan Zainuriah ◽  
Abu Hassan Haslan ◽  
M.E. Kordesch
Keyword(s):  
Crystalline Structure ◽  
Growth Temperature ◽  
Structure Type ◽  
X Ray Diffraction ◽  
General Picture ◽  
X Ray ◽  
Si Films ◽  
Substrate Temperatures ◽  
Deposited Films

In this paper, we report on the characterization of a set of MOCVD grown GaN samples with a variety of structural or crystalline quality. X-ray diffraction (XRD) was used to observe the change of the crystalline structure with deposition temperature. All results show that the structure type of the GaN deposited films is sensitive to the growth temperature. Our results also revealed that a good crystalline structure of GaN films could be grown at temperatures higher than 600°C. Finally, a general picture on the correlations between the growth temperature and the GaN deposited films crystalline is reported.

Notizen: CsNaSe — das erste Interalkalimetallchalkogenid mit Cäsium / CsNaSe – the First Inter Alkali Metal Chalkogenide with Cesium

1993 ◽  
Vol 48 (12) ◽  
pp. 1837-1838 ◽  
Author(s):  
Horst Sabrowsky ◽  
Volker Winter ◽  
Elisabeth Feldbaum-Möller ◽  
Petra Vogt
Keyword(s):  
Alkali Metal ◽  
Structure Type ◽  
X Ray ◽  
Tetragonal Lattice

The grey compound CsNaSe has been prepared. The characterization by X-ray powder methods leads to a tetragonal lattice (P 4/nmm) with a = 499.0(1), c = 808.7(2) pm and Z = 2. The structure is related to the PbFCl structure type.

Sign in / Sign up

Export Citation Format

Share Document