Induction melting synthesis

One more ternary compound which was not observed in the course of phase-equilibrium studies, was characterized by Rossi and Ferro (1996). CeZni.5Geo.5 was foimd to be isotypic with an AIB2 type, a = 0.4447, c = 0.3924 from X-ray powder diffraction of an induction melted alloy which was afterwards aimealed at 1070K for one week. An electronic micrographic examination as well as microprobe microanalysis were carried out. The metals employed in the synthesis of samples had a nominal purity of 99.9 mass% for cerium, and 99.999 mass% for other metals. 

Synthesis in hot crucibles is also widely practiced. Induction melting in sealed crucibles, typically Ta or W, offers the only means of dealing with extremely high... 

There are a limited number of techniques used for the synthesis of ternary and quaternary nitrides. In fact, the vast majority of these nitrides have been synthesized using only two methods (1) the reaction of a metal nitride with a metal or another metal nitride and (2) the reaction of two metal powders with nitrogen gas or ammonia. The first method has been the most common approach (Table 8.1, Reaction 1). Since these reactions usually require high temperatures (1073-2073 K), the inductive effect is Used to effect product formation. Li3N is a favored starting material due to its stability and relatively low melting temperature (mp = 1086 K), which... 

The cholesteric mesophase formed by cholesteryl p-nitrobenzoate at 200 °C has been used as the solvent to effect an asymmetric synthesis lrans-but-2-enyl p-tolyl ether gave the product of an ortho-Claisen rearrangement, 2-(but-1 -en-3 -yl)-4-methylphenol. This material exhibited circular dichroism, although neither the optical yield nor the configuration of the product is yet known.262 Decarboxylation of ethylphenylmalonic acid in cholesteryl benzoate at 160 °C (cholesteric liquid-crystalline phase) also proceeded with asymmetric induction to give (R)-(—)-2-phenylbutyric acid, with 18% optical yield.263 Electric dipole moments are reported for some esters of 5a-cholest-8(14)-en-3j8-ol there is some slight correlation with melting points.264... 

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