Two Isotypic Transition Metal Germanophosphates MII4(H2O)4[Ge(OH)2(HPO4)2(PO4)2] (MII = Fe, Co): Synthesis, Structure, Mössbauer Spectroscopy, and Magnetic Properties

Autor:	Jing-Tai Zhao, Mei-Bo Tang, Walter Schnelle, Jun Lin, Xuan Huang, Ya-Xi Huang, Xin Zhang, Jin-Xiao Mi
Rok vydání:	2012
Předmět:	Chemistry Inorganic chemistry chemistry.chemical_element Crystal structure Inorganic Chemistry Paramagnetism Crystallography Transition metal Octahedron Mössbauer spectroscopy Antiferromagnetism Physical and Theoretical Chemistry Single crystal Cobalt
Zdroj:	Inorganic Chemistry. 51:3316-3323
ISSN:	1520-510X 0020-1669
Popis:	Synthetic, structural, thermogravimetric, Mossbauer spectroscopic, and magnetic studies were performed on two new isotypic germanophosphates, MII4(H2O)4[Ge(OH)2(HPO4)2(PO4)2] (MII = Fe, Co), which have been prepared under hydro-/solvo-thermal conditions. Their crystal structures, determined from single crystal data, are built from zigzag chains of MIIO6-octahedra sharing either trans or skew edges interconnected by [GeP4O14(OH)4]8– germanophosphate pentamers to form three-dimensional neutral framework structure. The edge-sharing MIIO6-octahedral chains lead to interesting magnetic properties. These two germanophosphates exhibit a paramagnetic to antiferromagnetic transition at low temperatures. Additionally, two antiferromagnetic ordering transitions at around 8 and 6 K were observed for cobalt compound while only one at 19 K for the iron compound. Low-dimensional magnetic correlations within the octahedral chains are also observed. The divalent state of Fe in the iron compound determined from the Mossbau...
Databáze:	OpenAIRE
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