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Charge Density Wave instabilities represent a particular type of phase transitions which can be well illustrated by the properties of niobium and tantalum trichalcogenides. Some basic features of CDW's instabilities are reminded. Then, NbSe3 and some related compounds such as monoclinic TaS3 and the (Fe ‐ Nb)Nb2Se10 series, are the basis of an experimental illustration of the concepts. NbSe3 exhibits two CDW's phase transitions at T1 (145 K) and T2 (59 K). The feature which makes NbSe3 unique is the non ohmicity observed at very low electric field (few tenths of mV‐cm−1) just below T1 and T2. It is now well established that this non linear effect results from the depinning of CDW, which carries a current. Conclusion is indicative of the role of the anion pairing in the triangular base of the trigonal prism, of the cation pairing along the chain and of the interchain coupling.
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Rouxel et al. (1983) studied this question.
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