Project description
Shedding new light on materials’ stability and thermal conductivity
Thermoelectric materials that can transfer heat and electrical energy to each other will boost numerous electric devices' and production sites' energy efficiency, thus reducing the world’s energy demand. Their low thermal conductivity can recover waste heat. Greater awareness of structure–property relationships could be key to attaining materials with properties appropriate for thermoelectric applications. The EU-funded JG-GH-UCLouvain project will assess coordination polyhedra – the spatial arrangement of ligand atoms directly attached to the central atom – and their connections, searching for oxides and other chemistries. Ultimately, the project will provide greater insight into coordination polyhedra, their connections and connection to crystals’ stability and other properties.
Objective
Inorganic crystalline materials promise solutions to some of our major global problems. Thermoelectric materials, for example, are expected to increase the energy efficiency of many electric devices or production sites to lower the global need for energy. To arrive at materials with properties relevant for thermoelectric applications, a better understanding of structure-property relationships could play a key role. Linus Pauling’s famous five rules on the stability of crystal structures will serve as a starting point for such an improved understanding because they describe the relation between structure and stability based on coordination polyhedra and their connections. They will be assessed for oxides and other chemistries. This will be based on the Materials Project database and a recent study of the statistics of coordination environments in oxides from the host institute. Next, a graph representation of crystal structures based on coordination polyhedra and their connections will be established to go beyond Pauling’s rules. The graphs will then be analysed and classified. Beyond stability, there is a recent design principle relating coordination polyhedra to lattice thermal conductivity–an essential property for thermoelectrics. It will be applied to search for oxides as potential candidates for thermoelectric applications. The design principle is based on the instability of small cations in octahedral coordination environments that is connected to low thermal conductivity. The recent development of one of the first databases of phonon computations at the host institute offers a great opportunity to link phonon and especially soft modes to coordination environments. The best candidates from the search will be synthesized and analysed by a cooperation partner of the host institute. In sum, the project is expected to lead to a better understanding of coordination polyhedra, their connections, and their relation to the stability and other properties of crystals.
Fields of science
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Programme(s)
Funding Scheme
MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)Coordinator
1348 Louvain La Neuve
Belgium