Abstract
In this paper, we present evidence, from simultaneous electrical resistivity and thermogravimetric measurements, for a phase transition occurring at approximately 378 K in the charge-density-wave system 1T-TaS2 when fully intercalated with hydrazine and then heated in a hydrazine environment. We discuss this change in terms of a transition between a commensurate ( square root 7/8)a*x( square root 7/8)a* superlattice already known to exist at room temperature in the intercalated material, and a weaker incommensurate distortion. We also discuss the effect of hydrazine intercalation on the 282 K transition observed on warming in pure 1T-TaS2, and give further evidence for the partial inter-layer character of this transition.
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