About the Seminar:
Hexagonal perovskites share the ABX3 stoichiometry and cation coordination environments of the more widely studied “cubic” perovskite family, but unlike their cubic counterparts, hexagonal perovskites feature face-sharing linkages between metal-centered octahedra. When transition-metal ions occupy these sites there can be sufficient overlap of d-orbitals on neighboring metals to form metal-metal bonds. In this talk I will discuss the structure, bonding and magnetism of hexagonal perovskites featuring M2X9n− and M3X12m− clusters of face sharing octahedra. Broadly speaking the compounds discussed can be divided into three categories (1) those where clusters containing magnetic transition metal ions are isolated from each other by octahedra containing diamagnetic cations like Mo(VI), W(VI) and Sb(V), (2) those where the clusters are linked by octahedral containing magnetic cations like Re(VI), and (3) those where the clusters are connected directly. Representative examples will be discussed that are of interest as ferrimagnets, antiferromagnets, quantum spin liquids, and altermagnets.
About the Speaker:
Patrick Woodward received BS degrees in Chemistry and General Engineering from Idaho State University in 1991, an MS in Materials Science and a PhD in Chemistry from Oregon State University in 1996, where he studied under Professor Arthur Sleight. He was a postdoc in the Physics Department at Brookhaven National Laboratory (1996−1998) before joining the faculty at Ohio State University in 1998, where he is currently the Newman Professor of Chemistry and Biochemistry. He has served as an Associate Editor of the Journal of Solid State Chemistry (2006-2011), Vice President of the Neutron Scattering Society of American (2014-2018). He organized the 2009 North American Solid State Chemistry Conference and served as chair of the 2018 Gordon Research Conference on Solid State Chemistry. He has been recognized as an NSF Career Fellow (2001), an Alfred P. Sloan Fellow (2004), a Fellow of the American Chemical Society (2020. He is co-author of two widely used textbooks, Chemistry: The Central Science and Solid State Materials Chemistry.
