Digitale Medien
Springer
Hyperfine interactions
72 (1992), S. 251-257
ISSN:
1572-9540
Schlagwort(e):
64.70 Kb
;
76.80.+7
;
62.50.+p
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract The results of an129I-Mössbauer study of the high-pressure phases of CuI at 4.2 K and for external pressures up to 71 kbar are reported. The isomer shiftS and the electric quadrupole interactionE q are found to undergo larges discontinuities at the crystallographic phase-transition pressures of ≅18 kbar from zinc-blence to rhombohedral structure and at ≅46 kbar from rhombohedral to tetragonal. The pressure coefficients of these hyperfine parameters are significantly different for the three phases (zinc-blende; rhombohedral; tetragonal) dS/dP=−3.3; =+1.5; =2.5×10−3 mm/s/kbar; dE q/dP=0.0; =−0.92;=+0.31 Mc/s/kbar. These results cannot be explained in terms of a simple molecular-orbital picture; instead, they reflect pressure-induced variations of the halogen-p/metal-d hybridization in the valence bands of the various phases of CuI.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF02398869
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