Aluminate systems

The same is true for the micas. However aluminous and ferric clay minerals do exist. It is apparent then that some point of divergency will be reached where aluminous systems will contain one set of phases and ferric systems, under the same physical conditions, will form another. Here... 

The general character of low charge and high Si-content of illites can be attributed to solid solution with a chemical component such as pyrophyllite in the aluminous system or chlorite in an Fe-Mg system. 

Ceramics in aluminate systems are usually formed from cubic crystal systems and this includes spinel and garnet. Rare earth aluminate garnets include the phase YAG (yttrium aluminium garnet), which is an important laser host when doped with Nd(III) and more recently Yb(III). Associated applications include applications as scintillators and phosphors. 

There are a variety of important crystal structures in aluminate systems. Among the most important are the spinel [16] and garnet structures [17,18]. These various structures reflect differences in the coordination polyhedron of both AI(III) and added components such as Mg(II), Ca(II), and the rare earth ions. In addition, studies of glass structure suggest a wealth of different coordination environments for both Al(III) and added components and structures that are not simply disordered forms of crystalline phases. 

From the liquid phases present in the amorphous Si02-sodium aluminate system, it is possible to obtain crystalline zeolites without the... 

The phase Katoite, Ca3[Al(OH)4]2(OH)4 and Gibbsite, Al(OH)3, are formed in the Ca-aluminate system. For Katoite with even the highest solubility of these low-solubiUty phases, a rough calculation shows the easiness of forming nanosize crystals. 

Aside from focusing specifically on glass formation, contactless processing is also ideally suited to studying high melting point liquids, which are otherwise prone to container contamination. Two diverse i lications of the importance of this capability are demonstrated in this thesis first it is applied to the smdy of a reported first order iso-composition liquid-liquid phase transition in the yttiia aluminate system [18]. 

Crystalline Systems discusses the structure of aluminate systems to illustrate structural changes dominated by the effects of phase transformations. 

It has also been observed that a sugar, in certain concentrations, may also act as an accelerator for the hydration of the tricalcium aluminate systems. Thermograms indicate that at 0.025-0.05% sucrose dosage, peaks due to cubic phases are intensified or those due to the hexagonal phases are decreased. This would show that sucrose is an accelerator. At concentrations of 2-5%, however, the number of hexagonal phases formed is diminished indicating that the hydration of C3A is retarded. ]... 

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