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A Lamellar Hydrated Barium Cobalt Phosphate with a Two-Dimensional Array of Co–O–Co Network: Ba(CoPO4)2·H2O

✍ Scribed by Xianhui Bu; Pingyun Feng; Galen D. Stucky

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
345 KB
Volume
131
Category
Article
ISSN
0022-4596

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✦ Synopsis

The hydrothermal synthesis and X-ray crystal structure of a hydrated barium cobalt phosphate are presented. The structure is built from cobalt octahedra edge-shared with phosphorus tetrahedra. Cobalt polyhedra form corner-sharing chains along the crystallographic b axis. These chains are interconnected by water molecules and phosphate groups to form an infinite twodimensional sheet. Sheets are stacked along the crystallographic c axis with charge balancing cations, Ba 2؉ , located in the interlayer region. The structure also consists of two-dimensional arrays of Co-O-Co networks with cobalt centers forming hexagonal patterns. There are a limited number of cobalt(II) phosphates in which the Co/P ratio is 1. A summary of these cobalt(II) phosphates is given. A classification scheme based on the extent of the Co-O-Co linkage is provided for cobalt phosphates. Crystal data for Ba(CoPO 4 ) 2 • H 2 O, M ‫؍‬ 463.16, space group C2 (No. 5), a ‫؍‬ 9.2494(4) A > , b ‫؍‬ 4.9140(2) A > , c ‫؍‬ 8.2650(4) A > , ‫؍‬ 91.744(2)°, V ‫؍‬ 375.48(3) A > 3 , Z ‫؍‬ 2, D c ‫؍‬ 4.097 g cm ؊3 , thin plate, MoK , ‫؍‬ 0.71073 A > , ‫؍‬ 10.005 mm ؊1 , 2 max ‫؍‬ 56.44°, R(F ) ‫؍‬ 2.43% for 70 parameters and 908 reflections with I'2 (I).

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