Structural Stability of the 1T Structure on Transition-Metal Dichalcogenides

• Published in: Journal of solid state chemistry Vol. 129; no. 2; pp. 242 - 249
• Main Authors: Shimakawa, M., Kawachi, K., Nishikawa, S., Hayashi, K.
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.03.1997
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1006/jssc.1996.7223

A new family of the 1T compounds is prepared in the NbS2–IrS2system and the NbSe2–IrSe2system. The end members of the above systems do not crystallize into the 1T structure. In the NbS2–IrS2system, the structure variation from the 2Hastructure to the pyrite structure through 1T structure has been observed as the average number of the valence electrons per atom increases. Also, in the NbSe2–IrSe2system, the structure variation from the 4Hastructure to the pyrite structure through 1T structure has been observed as the average number of the valence electrons per atom increases. The relative structural stability of the 1T structure in comparison with the 2Haand the pyrite structures is discussed. The electrical resistivity has been measured from room temperature to 30 K, and the magnetic susceptibility has been measured from room temperature to 5 K. The 1T compounds of those systems show semiconductive and weak-paramagnetic behavior.