Preparation, Properties and Crystal Structure of I_<0.5>TaSe_4(EXPERIMENTS ON (MX_4)_nY COMPOUNDS, International Symposium on NONLINEAR TRANSPORT AND RELATED PHENOMENA IN INORGANIC QUASI ONE DIMENSIONAL CONDUCTORS)

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この論文は国立情報学研究所の電子図書館事業により電子化されました。I_<0.5>TaSe_4 was obtained by heating the starting mixture having compositional ratio of Se/Ta=4 and I/Ta=1 in 460℃/420℃ temperature gradient for 1 week. The compound was tetragonal having lattice parameters a=9.555Å and c=12.75Å. The observed density was 5.99 g/cm^3. X-ray structural analysis showed that tantalum is coordinated with 4 Se-Se dimers forming [TaSe_4] infinit chain along c-axis. Iodine is located between the chain. There are two kinds of tantalum in the chain. The short distance of 3.24Å between Se and I suggests that iodine is partially transfered electrons from every two Ta through Se. The electrical resistivity along c-axis was 1.9 x 10^3 Ωcm at room temperature and the activation energy was 0.06 eV. Magnetic susceptibility showed very weak temperature dependence; -1.7 x 10^<-7> emu/g at room temperature and -1.7 x 10^<-8> emu/g at 77K. The presences of Ta^<4+>, Ta^<5+> and (Se-Se)^<2-> were observed on X-ray photoelectron spectrum comparing with those of TaSe_2, TaSe_3 and Ta_2O_5.
物性研究刊行会の論文
1984-01-20