Inter growth

Five zeolite minerals have been considered identical with mordenite with space group Cmcm. The possibility of a family of structures is considered four related ordered structures including Cmcm are proposed. Two of these (Cmcm and Imcm) have a one-dimensional system of large pores. The remaining pair (Cmmm and Immm) have a two-dimensional pore system with a second set of smaller channels. X-ray diffraction results show that synthetic and most mineral specimens have the Cmcm structure but also reveal mixtures of Cmmm, Immm, and Imcm with the Cmcm structure in three mineral specimens. Electron diffraction examination of a ptilolite sample reveals the Cmcm structure with an inter growth of the idealized structure Cmmm. Further tentative evidence for the existence of more than one ((mordenitef) framework structure, based on physical property characteristics, is discussed. 

Table 2 Compositions of the known sialon inter growth structures...

Figure 4 CSEM/SEI of eutectic micro structure for system H20-MgS04. The lighter phase that stands in relief is hydrate the recessed, mottled phase in the inter growth as well as in the large void is water ice. Composition of this sample is 17.3 wt%MgS04 which corresponds to the stable ice-l/undecahydrate eutectic.

Zeohte A commonly formed rhombic dodecahedra (truncated cubes with [110] faces evident. Fig. 5), sometimes in mixtures with cubic crystals in syntheses containing triethanolamine [18]. Depending upon the method of gel formation, zeohte X compositions were found to produce varying proportions of zeolite A, with inter-growths or over-growths of the two phases common. The... 

Figure 7 Oriented Inter growths in Beta Alumina (Electron Microscope Lattice Imaging)...

Wersing W. Microwave ceramics for resonators and filters. Ceramics, composites and inter growths, (1996), 715-731. 

The nueleation rate B) ean therefore subsequently be obtained from the inter-eept ( °) having evaluated G from the slope. Thus, analysis of erystal size distribution yields both growth and nueleation rates simultaneously, a great advantage experimentally. 

V. Yu. Novikov. Abnormal grain growth computer simulation. Inter/ Sci 6 11, 1998. 

Synthetic polymers are classified by their method of synthesis as either chain-growth or step-growth. The categories ate somewhat imprecise but nevertheless provide a useful distinction. Chain-growth polymers are produced by chain-reaction polymerization in which an initiator adds to a carbon-carbon double bond of an unsaturated substrate (a vinyl monomer) to yield a reactive inter-... 

The anode seal which closes the sodium compartment is a nickel—chromium alloy (Inconel 600). The application of Inconel 600 minimizes the growth of thick inter-metallics and it was shown that seals of this material have been operated for over three years. Contrarily to Inconel, the application of mild steel as the anode seal material gave a life of only 6000 h due to gross intermetallic growth which caused sodium attack of this intermetallic layer in the mild steel. 

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