Unique charge ordering of manganese in a new mixed valent phosphate
| Autor: | L. Adam, Anne Guesdon, Bernard Raveau |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Materials science
chemistry.chemical_element Manganese Condensed Matter Physics Phosphate Hydrothermal circulation Electronic Optical and Magnetic Materials Inorganic Chemistry Charge ordering Crystallography chemistry.chemical_compound chemistry Octahedron Materials Chemistry Ceramics and Composites Tetrahedron Hydrothermal synthesis Physical and Theoretical Chemistry Monoclinic crystal system |
| Zdroj: | Journal of Solid State Chemistry. 182:2338-2343 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2009.06.017 |
| Popis: | A new mixed-valent manganese phosphate, K 3 Mn 3 II Mn III ( PO 4 ) ( H 0.5 PO 4 ) 2 ( HPO 4 ) 2 , has been synthesized using hydrothermal method. Its monoclinic C 2/ c structure ( a =12.5506(16) A, b =10.4816(18) A, c =13.6723(10) A, β =103.758(11)°) forms a 3D framework of MnO 6 octahedra, MnO 5 trigonal bipyramids, PO 4 and PO 3 OH tetrahedra. The main structural feature of this phosphate deals with its [Mn 4 O 16 ] ∞ chains running along c ⇒ , which are interconnected through PO 4 and PO 3 OH tetrahedra, forming intersecting tunnels running along [110], [ 1 1 ¯ 0 ] and [001]. The geometry of the [Mn 4 O 16 ] ∞ chains and the charge ordering of manganese in the latter are unique: they consist of trimeric units of divalent manganese “ Mn 3 II O 12 ” alternating with single trivalent Mn III O 6 octahedra along c ⇒ . In each “ Mn 3 II O 12 ” unit one central Mn II O 6 octahedron shares two opposite edges with two Mn II O 5 trigonal bipyramids. Along c ⇒ , one Mn(II) octahedron alternates with one Mn(III) octahedron by sharing one corner. The relationships between the structure of this unique charge ordered phosphate and other manganese phosphates are discussed. |
| Databáze: | OpenAIRE |
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