A new nine-coordination system: Pentagonal interpenetrating tetrahedral polyhedron |
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| Institution: | 1. State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China;2. Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai 200092, China;3. Shanghai Environmental Protection Key Laboratory on Environmental Standard and Risk Management of Chemical Pollutants, East China University of Science and Technology, Shanghai 200237, China |
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| Abstract: | A new nine-coordination geometry has been discovered. Monazite-type compounds, such as LnPO4 (Ln = La, Ce, Pr, Nd, Sm, Eu, and Gd), LnAsO4 (Ln = La, Ce, Pr, and Nd), α-PbSeO4 (Rooseveltite), BiPO4, PbCrO4 (Crocoite), α-PbSeO4, PuPO4, LaVO4, SrCrO4, SrSeO4, and ThSiO4, exhibit this new nine-coordination geometry. The new geometric form is best described as a pentagonal interpenetrating tetrahedral polyhedron (PITP). |
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