Postspike facilitation of forelimb muscle activity by primate corticomotoneuronal cells

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摘要：

Within the system Cu-Fe-Zn-Sn-S, stannite Cu-2(Fe,Zn)SnS4, kesterite Cu-2(Zn,Fe)SnS4, mawsonite Cu6Fe2SnS8, stannoidite Cu-8(Fe,Zn)(3)Sn2S12, and a number of stannite variants have been studied by Gandolfi X-ray camera and electron microprobe. In all the examined samples, the compounds are stoichiometric with no significant positional disorder, a result confirmed by structure refinements. Despite appreciable (Fe,Zn) and (Zn, Fe) substitutions in stannite and kesterite respectively, observed variations of lattice parameters with composition confirm the miscibility gap. "Zincian stannite" (Berry & Thompson 1962) is a mixture of kesterite with exsolved stannite. The "unknown phase" of Petruk (1973) is a mixture of kesterite and stannoidite. X-ray powder patterns, reflectivity and microhardness data are provided for specimens utilized in the structure refinements of mawsonite (Szymanski 1976) and stannite and kesterite (Hall et al. 1978).

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关键词：

petrofabric analysis sulfides scanning electron microscopy electron channeling

DOI：

10.1152/jn.1980.44.4.751

被引量：

1146

年份：

1980