scholarly journals Ion-Exchange Reaction Of A-Site In A2Ta2O6 Pyrochlore Crystal Structure

2015 ◽  
Vol 60 (2) ◽  
pp. 941-944 ◽  
Author(s):  
M. Matsunami ◽  
T. Hashizume ◽  
A. Saiki
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Ion Exchange ◽  
Room Temperature ◽  
Electrode Materials ◽  
Pyrochlore Structure ◽  
Rechargeable Battery ◽  
Ion Exchange Reaction ◽  
Li Ion ◽  
A Site

Abstract Na+ or K+ ion rechargeable battery is started to garner attention recently in Place of Li+ ion cell. It is important that A+ site ion can move in and out the positive-electrode materials. When K2Ta2O6 powder had a pyrochlore structure was only dipped into NaOH aqueous solution at room temperature, Na2Ta2O6 was obtained. K2Ta2O6 was fabricated from a tantalum sheet by a hydrothermal synthesize with KOH aqueous solution. When Na2Ta2O6 was dipped into KOH aqueous solution, K2Ta2O6 was obtained again. If KTaO3 had a perovskite structure was dipped, Ion-exchange was not observed by XRD. Because a lattice constant of pyrochlore structure of K-Ta-O system is bigger than perovskite, K+ or Na+ ion could shinny through and exchange between Ta5+ and O2− ion site in a pyrochlore structure. K+ or Na+ ion exchange of A2Ta2O6 pyrochlore had reversibility. Therefore, A2Ta2O6 had a pyrochlore structure can be expected such as Na+ ion rechargeable battery element.

A facile room temperature chemical transformation approach for binder-free thin film formation of Ag2Te and lithiation/delithiation chemistry of the film

2016 ◽  
Vol 45 (43) ◽  
pp. 17312-17318 ◽  
Author(s):  
Eun-Kyung Kim ◽  
Dasom Park ◽  
Nabeen K. Shrestha ◽  
Jinho Chang ◽  
Cheol-Woo Yi ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Aqueous Solution ◽  
Ion Exchange ◽  
Chemical Transformation ◽  
Room Temperature ◽  
Film Formation ◽  
Synthetic Method ◽  
Binder Free ◽  
Thin Film Formation

An aqueous solution based synthetic method for binder-free Ag2Te thin films using ion exchange induced chemical transformation of Ag/AgxO thin films.

scholarly journals Crystal structure of a new lithium iron vanadate

2014 ◽  
Vol 70 (a1) ◽  
pp. C1101-C1101
Author(s):  
Laurent Castro ◽  
Nicolas Penin ◽  
Dany Carlier ◽  
Alain Wattiaux ◽  
Stanislav Pechev ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Room Temperature ◽  
Magnetic Measurements ◽  
Charge Compensation ◽  
Li Ion Batteries ◽  
New Materials ◽  
Single Crystal Diffraction ◽  
Structural Relationships ◽  
Network Flexibility ◽  
Li Ion

Iron vanadates and phosphates have been widely explored [1-2] as possible electrode material for Li-ion batteries. In the goal of finding new materials, our approach was to consider existing materials and to investigate the flexibility of their network for possible substitutions. Among the different materials containing iron and vanadium, Cu3Fe4(XO4)6 (X = P, V) are isostructural to Fe7(PO4)6. Lafontaine et al. [3] discussed the structural relationships between β-Cu3Fe4(VO4)6 and several other vanadates, phosphates and molybdates of general formula AxBy(VO4)6. The interesting network flexibility was then demonstrated with the existence of four different crystallographic sites, which can be partially occupied depending on the x+y value : x+y = 7 for β-Cu3Fe4(VO4)6) and x+y = 8 for NaCuFe2(VO4)3. The LixFey(VO4)6 phase was then prepared considering the substitution of Li+ and Fe3+ for Cu2+ ions in β-Cu3Fe4(VO4)6 and the existence of an extra site to accommodate the charge compensation (7 ≤ x+y ≤ 8). As expected, a new lithium iron vanadate, isotructural to mineral Howardevansite was then obtained. Single crystal diffraction data were collected at room temperature on Enraf-Nonius CAD-4 diffractometer. Structure was refined with JANA-2006 program package. Mössbauer and magnetic measurements were also used to check the oxidation state of iron ions, to support the obtained crystal structure and to consider any possible structural/magnetic transitions. All the results will be presented and discussed in this presentation.

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.

Preparation of a positively charged nanofiltration membrane based on hydrophilic–hydrophobic transformation of a poly(ionic liquid)

2015 ◽  
Vol 3 (23) ◽  
pp. 12367-12376 ◽  
Author(s):  
Ying Tang ◽  
Beibei Tang ◽  
Peiyi Wu
Keyword(s):  
Aqueous Solution ◽  
Ionic Liquid ◽  
Ion Exchange ◽  
Exchange Reaction ◽  
Composite Membrane ◽  
Nanofiltration Membrane ◽  
High Permeability ◽  
Ion Exchange Reaction ◽  
Poly Ionic Liquid ◽  
Positively Charged

A positively charged NF composite membrane with high permeability was obtained via a simple counter-ion exchange reaction in an aqueous solution, due to the hydrophilic–hydrophobic transformation of the PIL.

scholarly journals Crystal structure of 6-deoxy-α-L-psicofuranose

2015 ◽  
Vol 71 (12) ◽  
pp. o993-o994
Author(s):  
Akihide Yoshihara ◽  
Tomohiko Ishii ◽  
Tatsuya Kamakura ◽  
Hiroaki Taguchi ◽  
Kazuhiro Fukada
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Cell Volume ◽  
Title Compound ◽  
Room Temperature ◽  
Ring Structure ◽  
Compound C

The title compound, C6H12O5, was crystallized from an aqueous solution of 6-deoxy-L-psicose (6-deoxy-L-allulose, (3S,4S,5S)-1,3,4,5-tetrahydroxyhexan-2-one), and the molecule was confirmed as α-furanose with a3T4(orE4) conformation, which is a predominant tautomer in solution. This five-membered furanose ring structure is the second example in the field of the 6-deoxy-ketohexose family. The cell volume of the title compound [742.67 (7) Å3,Z= 4 at room temperature] is only 1.4% smaller than that of β-D-psicopyranose, C6H12O6(753.056 Å3,Z= 4 at room temperature).

scholarly journals OLIGOMERIC CHROMIUM(III) POLICATION SPECIES-PILLARED LAYERED TETRATITANATES ANION

2010 ◽  
Vol 7 (1) ◽  
pp. 10-16 ◽  
Author(s):  
Hari Sutrisno ◽  
Endang Dwi Siswani
Keyword(s):  
Aqueous Solution ◽  
Ion Exchange ◽  
Room Temperature ◽  
Lattice Parameter ◽  
Bravais Lattice ◽  
Monoclinic Crystal System ◽  
Monoclinic Crystal ◽  
Crystal System ◽  
High Crystallinity

Intercalation of oligomeric chromium(III) polycation species in layered tetratitanates was prepared by three steps: 1) ion-exchange of H+ for K+ in potasium tetratitanates, 2) intercalation of n-alchylamine (n-propylamine, n-butylamine, n-amylamine, and n-hexylamine) compounds in layered hydrogen tetratitanates by adding an aqueous solution of  5M n-alchylamine to  hydogen titanates with stiring at room temperature,  and 3) intercalation of oligomeric chromium(III) polycation species by mixing butylamine-intercalated tetratitanates with an aqueous solution of CrCl3.6H2O at pH various. The procedure was carried out by Chimie Douce method. The results showed that all of n-alchylamine-intercalated tetratitanates crystallize on monoclinic crystal system with the Bravais lattice C. The hight intensity of the first peaks (200)  indicated that butylamine and amylamine-intercalated tetratitanates have a remarkably high crystallinity without impurities phase. The interlayered distance (d) and  the lattice parameter projected along a increase with increasing the amount of C-atoms in n-alchylamine. At pH=1.3, [CrCl(H2O)5]2+ or [CrCl2(H2O)4]+ species was pillared more efective in layered tetratitanates than [Cr(H2O)6]3+ spesies and just one spesies, Cr(H2O)6]3+ at  pH=1.7. On the contrary, [Cr(OH)(H2O)5]2+ or [Cr(OH)2(H2O)4]+ was  intercalated more effevtive than [Cr(H2O)6]3+ species  at pH=5.3.   Keywords: tetratitanates, intercalation, oligomeric chromium(III) species, Chimie Douce.

A more efficient copper-ion-exchanged ZSM-5 zeolite for N2 adsorption at room temperature: Ion-exchange in an aqueous solution of Cu(CH3COO)2

2001 ◽  
Vol 3 (7) ◽  
pp. 1383-1390 ◽  
Author(s):  
Yasushige Kuroda ◽  
Ryotaro Kumashiro ◽  
Atsushi Itadani ◽  
Mahiko Nagao ◽  
Hisayoshi Kobayashi
Keyword(s):  
Aqueous Solution ◽  
Ion Exchange ◽  
Room Temperature ◽  
Copper Ion ◽  
N2 Adsorption

scholarly journals On verdigris, part II: synthesis of the 2-1-5 phase, Cu3(CH3COO)4(OH)2·5H2O, by long-term crystallisation from aqueous solution at room temperature

2018 ◽  
Vol 47 (25) ◽  
pp. 8209-8220 ◽  
Author(s):  
Sebastian Bette ◽  
Reinhard K. Kremer ◽  
Gerhard Eggert ◽  
Robert E. Dinnebier
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Room Temperature ◽  
Spectroscopic Properties

Long-term crystallisation led to the formation of the 2-1-5 verdigris phase (Cu3(CH3COO)4(OH)2·5H2O). The crystal structure, as well as magnetic, thermal and spectroscopic properties, was investigated.

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