Crystal structure of Pb3O2(OH)Br,a Br-analogue of damaraite |
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| Institution: | 1. Department of Crystallography, Faculty of Geology, St. Petersburg State University, University Emb. 7/9, St. Petersburg 199034, Russia;2. Department of Civil Engineering and Geological Sciences, 156 Fitzpatrick Hall, University of Notre Dame, Notre Dame, IN 46556-0767, USA;1. Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, PR China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China;1. College of Electronic Information and Engineering, Hangzhou Dianzi University, Hangzhou 310018, China;2. College of Materials Sciences and Engineering, Hangzhou Dianzi University, Hangzhou 310018, China;3. Instrument Analysis and Testing Center, Fuzhou University, Fuzhou 350002, China;4. Ningbo Institute of Materials Technologies and Engineering, Chinese Academy of Sciences, Ningbo 315201, China |
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| Abstract: | The crystal structure of Pb3O2(OH)Br (orthorhombic, Pmc21, a=5.8447(8), b=7.0715(10), c=15.309(2) Å, V=632.75(15) Å3) has been solved by direct methods and refined to R1=0.046 (wR=0.077). The structure is based on O2Pb3] chains of edge-sharing OPb4 oxocentered tetrahedra that extend parallel to the a axis and occur in two orientations inclined to each other by ∼50°. The O2Pb3] chains are linked through OH(3) groups to form an Pb3O2](OH) sheet that is parallel to (010). Additional OH(4) groups are attached to the O2Pb3] chains. The OH groups form two short (OH)Pb bonds that results in (OH)Pb2 dimers. |
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