About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Alloys and Compounds for Thermoelectric and Solar Cell Applications XII
|
Presentation Title |
Crystal Chemistry of Metal Pnictides: Tunable Systems for Energy Applications |
Author(s) |
Kirill Kovnir |
On-Site Speaker (Planned) |
Kirill Kovnir |
Abstract Scope |
Pnictogens, P and As, can form extended polyatomic fragments thus mimicking the chemical diversity of carbon. The structure and properties of metal pnictides are controlled by the electron count and size of metal atoms. When electron count is matching 4 electron per framework atoms, pnictides form tetrahedral frameworks, such as clathrates. Increasing of the valence electron concentration above 4 e/atom resulted in low-dimensional anisotropic structures. Peculiarities of metal-pnictogen bonding allow to tune the electronic structure and bandgap of the pnictide materials in 0-2 eV range. Several examples of emergent pnictide photovoltaic, thermoelectric, and non-linear optical materials will be discussed. Synthesis of complex pnictides is hampered by drastic differences in reactivities of constituent elements and a high vapor pressure of pnictogens. Several strategies to improve synthesis and produce challenging phases will be discussed, such as averaging precursor reactivity by atomic mixing and prebuilding chemical bonds in the precursor. |
Proceedings Inclusion? |
Planned: |
Keywords |
Energy Conversion and Storage, Electronic Materials, Characterization |