ISSN:
1432-2021
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
,
Geologie und Paläontologie
,
Physik
Notizen:
Abstract Single crystal Raman spectra of pyrite-type RuS2, RuSe2, OsS2, OsSe2, PtP2, and PtAs2 are presented and discussed with reference to the energies of the X-X stretching modes ν x-x (A g, F g) and the X2 librations $$R_{x_2 } $$ (E, 2Fg). The main results obtained are (i) strong Raman resonance effects, (ii) different sequences for ν x-x (A g) and $$R_{x_2 } $$ (E g), i.e., $$\nu _{x - x} 〉 R_{x_2 } $$ for PtP2 and PtAs2 and $$\nu _{x - x} 〉 R_{x_2 } $$ for OsS2, owing to the interplay of intraionic and interionic lattice forces, (iii) greater strengths for the intraionic P-P and As-As bonds compared to the S-S and Se-Se bonds, respectively, and (iv) a strong influegnce of the metal ions on the strength of the X-X bonds.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00202242
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