THE CONDUCTION BAND OF CERIUM SULFIDE Ce$sub 3$-XS$sub 4$
A study of cerium sulfide, Ce/sub 3-x/S/sub 4/, over most of the range of composition, 0 < x < 1/3, has led to information about the conduction band. The compositions, determined by accurate density measurements, permitted evaluation of the electron concentration, n. The room temperature values of the electrical conductivity re p-terphenyl , the thermoelectric power alpha , and the Hall coefficient R/sub H/, were determined as a function of n over the range from 6 x 10/sup 20/ to 6 x 10/sup 21/ cm/sup -3/. The mobility is relatively low (2 to 3 cm/sub 2//v-sec), but the thermoelectric power varies as n/sup -2/3/ as required by conventional theory for degenerate systems, and this permitted estimates of the effective mass and width of the conduction band. On the other hand, the Hall coefficient decreases below the value 1/ne as n is increased, indicating warping of the Fermi surface as the conduction band is filled. These results, and the analogy to transition metal oxides, suggest the possibility that the conduction band arises primarily from overlapping 5d orbitals of the cerium ions. (auth)
- Research Organization:
- General Atomic Div., General Dynamics Corp., San Diego, Calif.
- NSA Number:
- NSA-17-020709
- OSTI ID:
- 4719997
- Journal Information:
- Phys. Chem. Solids, Journal Name: Phys. Chem. Solids Vol. Vol: 24
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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