Issue Information :
روزنامه با شماره پیاپی سال 2004
Pages :
4
From page :
525
To page :
528
Abstract :
The temperature dependence of dc resistance (R)[ln(R) vs T−1/4] was observed in the range of 170<T<300 K for layered-rock-salt (hexagonal structure, ordered distribution between Li and Co) and modified-spinel (cubic, random distribution) phases of LiCoO2. The results suggest Mott-type hopping conduction arising from the localized Co-3d electrons in the valence band. The densities of states (DOS) at the Fermi energy (EF) estimated from the slope of the resistance curves were 2.0×1020 and 5.5×1019 cm−3 eV−1 for the ordered and disordered phases, respectively. The relatively low DOS at EF in the disordered phase suggests that EF approaches the edge of the valence band as a result of the narrowing of Co-t2g bands due to the higher lattice symmetry in the disordered phase.
Journal title :
Acta Tropica
Serial Year :
2004
Journal title :
Acta Tropica
Record number :
1748207
Link To Document :
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