Coupled Commensurate Cation and Charge Modulation in the Tunneled Structure, Na0.40(2)MnO2

Autor:	Chris Stock, Paweł Zajdel, Izabela I. Kruk, Mark Green, Alexandros Lappas, Ioanna Bakaimi, Wouter van Beek
Rok vydání:	2011
Předmět:	Crystallography Colloid and Surface Chemistry Valence (chemistry) Octahedron Chemistry PNNM Synchrotron radiation Neutron General Chemistry Biochemistry Catalysis Square pyramidal molecular geometry
Zdroj:	Journal of the American Chemical Society. 133:13950-13956
ISSN:	1520-5126 0002-7863
DOI:	10.1021/ja109707q
Popis:	Na(0.40(2))MnO(2) belongs to a family of mixed Mn(3+) and Mn(4+) porous oxides that contains both octahedral and square pyramidal Mn-O units. Neutron and synchrotron radiation studies identify the presence of both sodium ordering (T(Na) ≈ 310 K) and Mn charge and orbital ordering. Below T(Na), the centrosymmetric Pbam structure adopts an (ab 4c) supercell of Pnnm symmetry that accommodates a coupled commensurate modulation down the c-axis channels of both Na position and occupancy with Mn valence.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6d699354204e581371f6eb06e137c084 https://doi.org/10.1021/ja109707q Zobrazit plný text záznamu