Crystal Structure of the Defect Pyrochlore Potassium Tantalate on Ion-Exchanging Dipping in Sodium Aqueous Solution by Rietveld Analysis

2018 ◽  
pp. 137-145
Author(s):  
Takashi Hashizume ◽  
Atsushi Saiki ◽  
Shogo Miwa
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Rietveld Analysis ◽  
Potassium Tantalate ◽  
Defect Pyrochlore

scholarly journals A comprehensive examination of the local- and long-range structure of Sb6O13 pyrochlore oxide

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
S. F. Mayer ◽  
J. E. Rodrigues ◽  
C. Marini ◽  
M. T. Fernández-Díaz ◽  
H. Falcón ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Rietveld Analysis ◽  
Edge Structure ◽  
X Ray ◽  
Valence States ◽  
Comprehensive Examination ◽  
Complete Set ◽  
Defect Pyrochlore ◽  
X Ray Absorption ◽  
Pyrochlore Oxide

Abstract The crystal structure of the Sb6O13 oxide, exhibiting a defect pyrochlore crystal structure with atomic vacancies, has been studied using a complete set of state-of-the-art techniques. The degree of antimony disproportionation in Sb3+ and Sb5+ valence states has been directly determined around 36% and 64%, respectively, using X-ray absorption near edge structure (XANES). These findings are in excellent agreement with our Rietveld analysis of synchrotron X-ray (SXRD) and neutron powder diffraction (NPD) results. Moreover, the highly distorted Sb3+ coordination due to its lone electron pair has been critically revisited. The bonding distances and coordination of Sb3+ and Sb5+ species closely agree with an extensive dynamic and crystallographic determination using the Extended X-ray Absorption Fine Structure (EXAFS) technique. Most importantly, the specific local disorder of the two distinctive Sb ions has been crosschecked monitoring their unusual Debye–Waller factors.

Unusual π-π interactions directed by [{(C6H6)Ru}2W8O30(OH)2]6– hybrid anion

CrystEngComm ◽  
2021 ◽  
Author(s):  
Anna A Mukhacheva ◽  
Vladislav Komarov ◽  
Vasily Kokovkin ◽  
Alexander S. Novikov ◽  
Pavel A Abramov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Building Block ◽  
Π Interactions

The [{(C6H6)Ru}2W8O30(OH)2]6– hybrid (organometallic-POM) anion was used as a pH-tunable building block to create special conditions for realizing π-π interactions in the crystal structure. Changing pH of aqueous solution of...

A new three-dimensional anionic cadmium(II) dicyanamide network

2014 ◽  
Vol 70 (11) ◽  
pp. 1054-1056 ◽  
Author(s):  
Qiang Li ◽  
Hui-Ting Wang
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Unit Cell Volume ◽  
Three Dimensional ◽  
Building Blocks ◽  
The Other ◽  
Dimensional Structure ◽  
Cadmium Nitrate ◽  
Nitrate Tetrahydrate ◽  
Anionic Framework

A new cadmium dicyanamide complex, poly[tetramethylphosphonium [μ-chlorido-di-μ-dicyanamido-κ4N1:N5-cadmium(II)]], [(CH3)4P][Cd(NCNCN)2Cl], was synthesized by the reaction of tetramethylphosphonium chloride, cadmium nitrate tetrahydrate and sodium dicyanamide in aqueous solution. In the crystal structure, each CdIIatom is octahedrally coordinated by four terminal N atoms from four anionic dicyanamide (dca) ligands and by two chloride ligands. The dicyanamide ligands play two different roles in the building up of the structure; one role results in the formation of [Cd(dca)Cl]2building blocks, while the other links the building blocks into a three-dimensional structure. The anionic framework exhibits a solvent-accessible void of 673.8 Å3, amounting to 47.44% of the total unit-cell volume. The cavities in the network are occupied by pairs of tetramethylphosphonium cations.

scholarly journals Crystal structure of the new hybrid material bis(1,4-diazoniabicyclo[2.2.2]octane) di-μ-chlorido-bis[tetrachloridobismuthate(III)] dihydrate

2015 ◽  
Vol 71 (11) ◽  
pp. 1384-1387
Author(s):  
Marwen Chouri ◽  
Habib Boughzala
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Hydrogen Bonds ◽  
Room Temperature ◽  
Molar Ratio ◽  
Water Molecules ◽  
Site Symmetry ◽  
Two Dimensional ◽  
Slow Evaporation ◽  
Solution Ph

The title compound bis(1,4-diazoniabicyclo[2.2.2]octane) di-μ-chlorido-bis[tetrachloridobismuthate(III)] dihydrate, (C6H14N2)2[Bi2Cl10]·2H2O, was obtained by slow evaporation at room temperature of a hydrochloric aqueous solution (pH = 1) containing bismuth(III) nitrate and 1,4-diazabicyclo[2.2.2]octane (DABCO) in a 1:2 molar ratio. The structure displays a two-dimensional arrangement parallel to (100) of isolated [Bi2Cl10]4−bioctahedra (site symmetry -1) separated by layers of organic 1,4-diazoniabicyclo[2.2.2]octane dications [(DABCOH2)2+] and water molecules. O—H...Cl, N—H...O and N—H...Cl hydrogen bonds lead to additional cohesion of the structure.

scholarly journals Synthesis and investigation of neptunium zirconium phosphate, a member of the NZP family: crystal structure, thermal behaviour and Mössbauer spectroscopy studies

2017 ◽  
Vol 46 (35) ◽  
pp. 11626-11635 ◽  
Author(s):  
D. M. Bykov ◽  
R. J. M. Konings ◽  
C. Apostolidis ◽  
A. Hen ◽  
E. Colineau ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Mössbauer Spectroscopy ◽  
Infrared Spectroscopy ◽  
Thermal Behaviour ◽  
Zirconium Phosphate ◽  
Mossbauer Spectroscopy ◽  
Rietveld Analysis ◽  
Mößbauer Spectroscopy ◽  
Spectroscopy Studies

We synthesized a new NZP-type neptunium zirconium phosphate Np0.29Zr2(PO4)3 and investigated it by Rietveld analysis, infrared spectroscopy and Mössbauer spectroscopy.

scholarly journals Crystal structure of β-D,L-fructose

2015 ◽  
Vol 71 (10) ◽  
pp. o719-o720 ◽  
Author(s):  
Tomohiko Ishii ◽  
Tatsuya Senoo ◽  
Akihide Yoshihara ◽  
Kazuhiro Fukada ◽  
Genta Sakane
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Three Dimensional ◽  
Equimolar Mixture ◽  
Compound C ◽  
Dimensional Network ◽  
Hydroxy Groups

The title compound, C6H12O6, was crystallized from an aqueous solution of equimolar mixture of D- and L-fructose (1,3,4,5,6-pentahydroxyhexan-2-one,arabino-hexulose or levulose), and it was confirmed that D-fructose (or L-fructose) formed β-pyranose with a2C5(or5C2) conformation. In the crystal, two O—H...O hydrogen bonds between the hydroxy groups at the C-1 and C-3 positions, and at the C-4 and C-5 positions connect homochiral molecules into a column along theaaxis. The columns are linked by other O—H...O hydrogen bonds between D- and L-fructose molecules, forming a three-dimensional network.

scholarly journals Crystal structure of sodium dihydrogen arsenate

2017 ◽  
Vol 73 (10) ◽  
pp. 1520-1522 ◽  
Author(s):  
Joseph Ring ◽  
Lorenz Lindenthal ◽  
Matthias Weil ◽  
Berthold Stöger
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Asymmetric Unit ◽  
Arsenic Acid ◽  
Distorted Octahedral Coordination ◽  
Sodium Cations ◽  
Distorted Octahedral ◽  
Coordination Spheres ◽  
Partial Neutralization ◽  
Sodium Dihydrogen

Single crystals of the title compound, Na(H2AsO4), were obtained by partial neutralization of arsenic acid with sodium hydroxide in aqueous solution. The crystal structure of Na(H2AsO4) is isotypic with the phosphate analogue and the asymmetric unit consists of two sodium cations and two tetrahedral H2AsO4−anions. Each of the sodium cations is surrounded by six O atoms of five H2AsO4−groups, defining distorted octahedral coordination spheres. In the extended structure, the sodium cations and dihydrogen arsenate anions are arranged in the form of layers lying parallel to (010). Strong hydrogen bonds [range of O...O distances 2.500 (3)–2.643 (3) Å] between adjacent H2AsO4−anions are observed within and perpendicular to the layers. The isotypic structure of Na(H2PO4) is comparatively discussed.

Sign in / Sign up

Export Citation Format

Share Document