As John Corbett wrote “It is always difficult to predict the unimaginable”, hence the endless need for exploratory research. Closely associated to this research, the serendipitous discovery of interesting and first-class physical properties, including thermoelectric properties, is also at stake.
In this presentation, two layered structured will exemplify the rich chemistry of complex chalocogenides. Both Ba4Cu8Se13 and InGeTe3 have layered structure that will be described thoroughly in terms of bonding and electron count rationale. These sandwich like structure have the propensity to exhibit staking default that are either inherent to the structure or cause by the disorder present around certain atomic position. In turn, these defects are responsible, in part, for the extremely low thermal conductivity of these phases. As this is a prerequisite for obtaining good thermoelectric properties, one could take advantage of this feature for future explorations…