ISSN:
1434-6036
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The far-infrared absorption spectrum (20–250cm−1) of the superionic conductor Li3N —with6Li- and7Li-isotopes in the starting material—has been measured for different polarizations and temperatures (4–150 K). TheE ⊥c spectrum yields two lines near 80 and 140 cm−1, which are not observed forE ⊥c. From the isotopic frequency ratio (ω 6/ω 7≃1.07) and from the comparison to lattice dynamics it is concluded that these lines are due to resonant modes, weakly coupled to the lattice. Measurements of the isotope effects on the dielectric properties (10 Hz to 1 MHz) establish that the local diffusive type motion in shallow potentials and the low lying resonant modes originate from the same defect system (including Li-ions in non-regular positions).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02109466
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