Les entreprises européennes, par David Granick, Éditions d’Organisation, 9, rue de Thann, Paris, 17e, France, 1963, 369 pages.

St-Laurent, Jacques

doi:10.7202/027534ar

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The restricted amount of Ca 11 N 6 (CN 2 ) 2 present in 2 may be due to the slight increase in reaction temperature over that used in the original report (1300 K) or a function of the cooling rate although single phase bulk samples of neither carbodiimide were obtained previously [17]. In fact the original mis-identification of a high temperature phase of Ca 3 N 2 at 1350 K [31] could be attributed to the formation of powders containing Ca 4 N 2 (CN 2 ) and Ca 11 N 6 (CN 2 ) 2 as the majority and minority phases, respectively.…”

Section: Resultsmentioning

confidence: 98%

3D Nitride Frameworks with Variable Channel Sizes; Synthesis and Powder Neutron Diffraction Study of the Nitride Carbodiimdes, Ca4N2(CN2) and Ca11N6(CN2)2

2009

View full text Add to dashboard Cite

The synthesis of powders of the calcium nitride carbodiimides, Ca 4 N 2 (CN 2 ) (1) and Ca 11 N 6 (CN 2 ) 2 (2) has been studied and the products characterised initially by powder X-ray diffraction. The latter phase (2) is unobtainable in pure bulk form and is always accompanied by the former compound. Nevertheless, definitive structures of the compounds were obtained from Rietveld refinements against time-of-flight powder neutron diffraction data. Each of the nitride carbodiimides are composed of Ca-N three dimensional networks built from edge-and vertexsharing NCa 6 octahedra arranged to create one-dimensional channels. The size of the channels is dependent on the Ca:C (host:guest) ratio and the larger channels in (1) are occupied by twice as many guest species as those in (2). Importantly, neutron diffraction data confirm that the identity of these guest species is carbodiimide (as opposed to isoelectronic azide), that neither the framework nor the channels therefore contain excess electrons and that the compounds are hence not ''nitride electrides'' as per the parent subnitride, Ca 2 N.

show abstract

Section: Resultsmentioning

confidence: 98%