Aluminum sesquioxide

P-ALUMINA y-ALUMINA ALUMINUM OXIDE o-ALUMINUM OXIDE P-ALUMNUM OXIDE y-ALUAHNUM OXIDE ALUMINUM SESQUIOXIDE ALUMTE ALUNDUM BROCKMANN, ALUMINUM OXIDE CAB-O-GRIP COMPALOX DIALUMINUM TRIOXIDE DISPAL DOTMENT 324 FASERTON G 2 (OXIDE) KHP 2 LUCALOX MICROGRIT WCA... 

But the admirable researches of Gay-Lussac and of Mitscherlich have established the fact, that in many instances, different compounds assume the same form. Thus, the following substances, and many others, take the form of the cube, tetrahedron, or regular octohedron, which are geometrically connected. Chloride of sodium (sea-salt), chloride of potassium, sal ammoniac bromide of potassium iodide of potassium sulphuret of lead fluoride of calcium bisnlphuret of iron arseniuret of cobalt sulphate of alumina and potash (alum) ammonia alum chrome alum, iron alum sesqnioxide of iron, sesquioxide of aluminum, sesquioxide of chromium. In like manner, other crystalline forms are found to be common to many different compounds, although none occurs so frequently as the cube and its congeners. 

Synonyms cas 1344-28-1 alumina alumite alundum activated aluminum oxide aluminum sesquioxide... 

Bauxite is the major source of aluminum sesquioxide alumina, Al Oj) worldwide. Bauxite is a soft and red clay, rich in alumina, and its name originates from Les Baux de Provence, a small vihage located in the region of Arles in southeastern France, where it was first discovered in 1821 by P. Berthier. From a geological point of view bauxite is defined as a residual sedimentary rock in the laterite family that results from in situ superficial weathering in... 

Aluminum sesquioxide, or a-alumina (a-Al Oj), also called calcined alumina (CA) or burned alumina in the ceramic and refractory industries, is the final product resulting from the thermal decomposition of all aluminum hydroxides. Actually, in the temperature range 1000-1250°C, the exothermic transformation of transition aluminas into a-Al Oj occurs... 

These two distinct processes lead to the formation of secondary minerals mainly phyl-losilicates such as clays, of soluble products (e.g., carbonates or silica) lixiviated by percolating waters and of colloids usually iron and aluminum sesquioxides complexed by humic acids. While physical degradation involves mechanical (e.g., abrasion, impact) or thermal (e.g., thermal shock) processes, alteration involves only chemical reactions such as hydrolysis influenced by pH conditions and/or the oxidation of primary materials depending on the Eh (redox potential) conditions. Whatever the type of underlying rock, the end product is always a clay except when silica is totally absent from the bedrock, the composition of the clay depending on the type of climate and the time over which the evolution process takes place. These conditions are summarized in Table 14.1. 

Cheluviation. Cheluviation involves the transport of organo-metallic complexes (i.e., chelates) of iron and aluminum. Once transported to the lower horizon B, the iron and aluminum precipitate as iron and aluminum sesquioxides forming colored spodic horizons denoted B,. 

II. Humic poorly differentiated Description soils slighly developed with an AC or even A(B)C profile. Soils formed onto noncalcareous bedrocks and preferably onto plutonic or volcanic igneous rocks. Occurs under humid climate along coastline or in montain regions. The humification and alteration processes are important. The depletion of calcium and the complexation of iron and aluminum sesquioxides is typical. ... 

Description total alteration of primary minerals except quartz. High level of iron and aluminum sesquioxides. 

Ash content (AC) consists of inorganic residue mostly composed of sodium and potassium carbonate, silica, iron and aluminum sesquioxides remaining after ignition and calcination of a sample of coal or coke according to standard ASTM D3174. 

Titanium Sesc uioxide. Ti202 has the comndum stmcture. At room temperature it behaves as a semiconductor having a small (0.2 eV) band gap. At higher temperatures, however, it becomes metallic. This is associated with marked change in the mean Ti—Ti distance. As with TiO, titanium sesquioxide, Ti202, may be made by heating a stoichiometric mixture of titanium metal and titanium dioxide powders at 1600°C under vacuum in an aluminum or molybdenum capsule. 

Accumulation of clay, iron, aluminum, humus, or in combination residual concentration of sesquioxides or clay or mixed sesqui-oxide coatings giving darker, stronger, redder colors or has granular, blocky, or prismatic structure. 

Mineral horizons in which the main feature is loss of silicate clay, iron, aluminum, or some combination of these, leaving a concentration of sand and silt particles Horizons formed below A, E, or O horizons. Show one or more of the following (i) illuvial concentration of silicate clay (Bt), iron (Bs), humus (Bh), carbonates (Bk), gypsum (By), or silica (Bq) alone or in combination (ii) removal of carbonates (Bw) (iii) residual concentration of oxides (Bo) (iv) coatings of sesquioxides that make horizon higher in chroma or redder in hue (Bw) (v) brittleness (Bx) or (vi) gleying (Bg). 

Mechanism (1) is particularly important in peat and other organic-rich sediments, where clay and metal complexes are present in very low amounts in relation to the humus component. A typical example of humic substances bound by polyvalent complexes (item 2) is the Spodosol. These soils have developed under climatic and biologic conditions that have resulted in the mobilization and transport of considerable amounts of iron, aluminum, and organic matter into the B horizon. This illuvial horizon is a rich source of fulvic acids, which are readily separated from the sesquioxides by mild extractants. 

The metal oxides thus far considered belong, in general, to the class of those which are reducible at moderately high temperatures in the presence of water or of alcohol. To the class of the so-called irreducible oxides of the metals and non-metals belong those of zinc, aluminum, molybdenum, silicon, and vanadium and chromium sesquioxide. The last has been described by Sabatier and Mailhe 06 as affording an excellent... 

ARSENIC SESQUIOXIDE (1327-53-3) Reacts, possibly violently, with acids, aluminum, aluminum chloride, chlorine trifluoride, chromic oxide, fluorine, fluorides, halogens, hydrogen fluoride, mercury, oxygen fluoride, phosphorus pentoxide, rubidium acetylide, sodium chlorate, sodium hydroxide, sulfuric acid, tannic acid, zinc, iron in solution. Contact with acids or acid mists releases deadly arsine gas. 

And this abbreviated expression contains, in a line, in addition to the general information concerning alum printed abov more information as to details than could be given in a page of print. It informs us, for example, that alum contains 4 eq. sulfuric acid, of which 1 is combined with 1 eq. of potash, and 3 with 1 eq. of alumina that alumina is a sesquioxide of aluminum that 1 eq. alum contains 1 eq. potassium, 2 eq. aluminum, 4 eq. sulphur, 24 eq. hydrogen, and 40 eq. oxygen, c. c. c. 

This metal is best obtained, like the last, by the action of potassium on the chloride. Chloride of aluminum is mixed with small bagments of potassium in a platinum crucible, the lid of which is wired down. Heat is then applied by means of a spirit-lamp, when a violent action ensues, and a dark grey mass is left, from which water dissolves chloride of potassium, leaving alumina as a grey powder, which has considerable lustre. It is not easily melted and when heated in the air, or in oxygen gas, it hums with a vivid light, forming alumina, which is a sesquioxide of the metal. 

Zirconia is found in the zircon or hyacinth. It resembles alumina in appearance. It differs from ml the preceding earths in being precipitated as an insoluble snbsulphate, when solntions of its smts are boiled with sulphate of pota. The metal, zirconium, resembles aluminum. The oxide is believed to be a sesquioxide Zr, 0,. 

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