Analysis of Mixtures of Gamma Lithium Aluminate, Lithium Aluminum Carbonate Hydroxide Hydrate, and Lithium Carbonate

1997 ◽  
Vol 496 ◽  
Author(s):  
M. T. Nemeth ◽  
R. B. Ford ◽  
T. A. Taylor
Keyword(s):  
Ceramic Powder ◽  
Lithium Carbonate ◽  
Lithium Aluminum ◽  
Carbonate Content ◽  
Lithium Aluminate ◽  
Molten Carbonate ◽  
X Ray Diffraction ◽  
Carbonate Hydroxide ◽  
Molten Carbonate Fuel Cells ◽  
Hydroxide Hydrate

ABSTRACTLithium aluminate, LiA1O2is a ceramic powder which is used as the porous solid support for the electrolyte in molten carbonate fuel cells (MCFCs). It has previously been reported that gamma LiAlO2will convert to lithium aluminum carbonate hydroxide hydrate, Li2Al4(CO3)(OH)123H2O and Li2CO3when exposed to water vapor and carbon dioxide. We compare three techniques, weight gain, carbonate content and x-ray diffraction to measure the amount of conversion. The reaction may involve amorphous intermediates and no one technique by itself is satisfactory to study the conversion.

Conversion of gamma lithium aluminate to lithium aluminum carbonate hydroxide hydrate

1996 ◽  
Vol 11 (4) ◽  
pp. 312-317 ◽  
Author(s):  
Susan Jacob Beckerman ◽  
Robert B. Ford ◽  
Mark T. Nemeth
Keyword(s):  
Ceramic Powder ◽  
Lithium Aluminum ◽  
Lithium Aluminate ◽  
Molten Carbonate ◽  
X Ray Diffraction ◽  
Decomposition Products ◽  
High Temperature Xrd ◽  
Carbonate Hydroxide ◽  
Molten Carbonate Fuel Cells ◽  
Hydroxide Hydrate

Gamma-phase lithium aluminate (LiAlO2) is a ceramic powder used in molten carbonate fuel cells (MCFCs) and in other nuclear and ceramic applications. Upon exposure to water vapor and carbon dioxide at 25 °C, we have observed that gamma-LiAlO2 converts to lithium aluminum carbonate hydroxide hydrate, Li2Al4(CO3)(OH)12·3H2O(LACHH) and Li2CO3. The conversion was observed by X-ray diffraction (XRD) and carbonate analysis. An equation for the conversion is given, and the morphology is determined by scanning electron microscopy. A high-temperature XRD study and thermogravimetric/differential thermal analysis (TGA/DTA) showed that LACHH decomposes at 250 °C. The decomposition products of LACHH and Li2CO3 react to form first alpha-LiAlO2 and then gamma-LiAlO2 at temperatures of 650 and 1000 °C, respectively.

ChemInform Abstract: Preparation and X-Ray Diffraction Characterization of the Kambaldaite- Like Sodium Cobalt Carbonate Hydroxide Hydrate, Na2Co8(CO3)6(OH)6. times.6 H2O.

ChemInform ◽  
2010 ◽  
Vol 26 (11) ◽  
pp. no-no
Author(s):  
K. PETROV ◽  
E. MIRTCHEVA ◽  
J. L. MARTIN DE VIDALES ◽  
R. ROJAS ◽  
O. GARCIA-MARTINEZ
Keyword(s):  
X Ray Diffraction ◽  
X Ray ◽  
Cobalt Carbonate ◽  
Carbonate Hydroxide ◽  
Hydroxide Hydrate

Lithium-aluminum-carbonate-hydroxide hydrate coatings on aluminum alloys: Composition, structure, and processing bath chemistry

1996 ◽  
Vol 11 (6) ◽  
pp. 1507-1513 ◽  
Author(s):  
C.A. Drewien ◽  
M. O. Eatough ◽  
D. R. Tallant ◽  
C. R. Hills ◽  
R. G. Buchheit
Keyword(s):  
Crystal Structure ◽  
Aluminum Alloys ◽  
Bulk Material ◽  
Lithium Carbonate ◽  
Lithium Aluminum ◽  
Nominal Composition ◽  
Al Alloy ◽  
Carbonate Hydroxide ◽  
Coating Formation ◽  
Composition Structure

A new corrosion resistant coating, being designed for possible replacement of chromate conversion coatings on aluminum alloys, was investigated for composition, structure, and solubility using a variety of techniques. The stoichiometry of the material, prepared by immersion of 1100 Al alloy into a lithium carbonate-lithium hydroxide solution, was approximately Li2Al4CO3(OH)12 · 3H2O. Processing time was shown to be dependent upon the bath pH, and consistent coating formation required supersaturation of the coating bath with aluminum. The exact crystal structure of this hydrotalcite material, hexagonal or monoclinic, was not determined. It was shown that both the bulk material and coatings with the same nominal composition and crystal structure could be formed by precipitation from an aluminum supersatured solution of lithium carbonate.

Copper enrichment on Al 2024 surface after de-oxidizing treatment

1993 ◽  
Vol 51 ◽  
pp. 860-861
Author(s):  
C. A. Drewien ◽  
R. G. Buchheit ◽  
K. R. Zavadil ◽  
T. E. Neil
Keyword(s):  
Aluminum Alloys ◽  
Salt Spray ◽  
Lithium Carbonate ◽  
Salt Spray Test ◽  
Lithium Aluminum ◽  
General Corrosion ◽  
Corrosion Properties ◽  
Carbonate Hydroxide ◽  
Processing Step ◽  
Aluminum Part

Coatings of lithium-aluminum-carbonate-hydroxide are being developed for corrosion protection of aluminum alloys against atmospheric and saline environments. Coating is performed by immersion of the aluminum part into a lithium carbonate-lithium hydroxide solution of pH=11.5. Before coating, the aluminum alloy is degreased in trichloroethylene, cleaned in a sodium carbonate-sodium silicate bath, and de-oxidized in nitric acid containing ammonium biflouride. Coating of most aluminum alloys is easily accomplished, and the coatings pass the ASTM B117 salt spray test. However, aluminum alloys that contain copper, specifically 2024-T3 and 7075-T6, yield coatings that fail the salt spray test, i.e. pitting and general corrosion is observed. Photographs of coatings after 168 hr salt spray exposure are shown in Figure 1 for Al 1100 and 2024-T3 alloys. A study has been undertaken to determine the influence of copper upon the corrosion properties of the coating.The surface of 2024-T3 was analyzed after each processing step in order to determine if copper enrichment at the specimen surface was occurring.

Preparation and x-ray diffraction characterization of the kambaldaite-like sodium cobalt carbonate hydroxide hydrate, Na2Co8(CO3)6(OH)6·6H2O

Polyhedron ◽  
1994 ◽  
Vol 13 (24) ◽  
pp. 3269-3275 ◽  
Author(s):  
K. Petrov ◽  
E. Mirtcheva ◽  
J.L.Martin de Vidales ◽  
R. Rojas ◽  
O. Garcia-Martinez
Keyword(s):  
X Ray Diffraction ◽  
X Ray ◽  
Cobalt Carbonate ◽  
Carbonate Hydroxide ◽  
Hydroxide Hydrate

Preparation of Lithium Aluminum Layered Double Hydroxide from Ammonium Dawsonite and Lithium Carbonate

2012 ◽  
Vol 1481 ◽  
pp. 29-36
Author(s):  
C. A. Contreras Soto ◽  
E. Ramos-Ramírez ◽  
V. Reyes Zamudio ◽  
J. I. Macías
Keyword(s):  
Layered Double Hydroxide ◽  
Lithium Carbonate ◽  
Lithium Hydroxide ◽  
Lithium Aluminum ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Aluminum Lithium ◽  
Different Temperatures ◽  
Double Hydroxide

ABSTRACTAluminum lithium hydroxide carbonate hydrate, also known as Al/Li layered double hydroxide or Al-Li hydrotalcite-like compound [Al2Li(OH)6]2CO3•nH2O, was prepared by reaction of lithium carbonate with ammonium dawsonite [NH4Al(OH)2CO3]. The reaction of ammonium dawsonite with a lithium carbonate satured solution at different temperatures and lithium carbonate concentrations was studied. The obtained solids were characterized by differential thermal analysis (DTA), thermogravimetry (TGA), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and transmission electron microscopy (TEM). By this method, crystalline Li/Al LDH [Al2Li(OH)6]2CO3·3H2O can be obtained at 60 °C and 4 h reaction time.

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