Chromium local bond distances

A discussion on the main spectroscopic techniques used in mineralogy and materials science is beyond the scope of this chapter. Several treatises and scientific papers dealing with this topic are already available. On the other hand, a thorough understanding of the local phenomena occurring when chromium is incorporated into the octahedral site of a perovskite structure, and, consequently, the know-how of deriving chromium-oxygen local distances is an essential requirement For this reason, in this section, it will be briefly explained how to obtain local bond distances by means of the electronic absorption spectroscopy (EAS), which is one of the most common and well-documented spectroscopic techniques in mineral sciences. 

The local chromium-oxygen bond distance for each composition of the perov-... 

Due to the subtle difference between Ga " and Cr " ionic radii at octahedral site, both mean metal-oxygen (Tables 12.2 and 12.3) and local chromium-oxygen (listed, along with other optical parameters, in Table 12.4) bond distances are constant within the standard deviation. On the basis of this... 

Cr(CO)3(CieHi4)] represents a pentahapto-complex (8). The localized double-bond system. The chromium atom makes close contact with only five carbon atoms of the ligand, and these are in the end ring which contains only two double-bonds the five bonded Cr-C distances... 

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