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http://hdl.handle.net/10773/19979
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DC Field | Value | Language |
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dc.contributor.author | Brandao, Paula | pt |
dc.contributor.author | Reis, Mario S. | pt |
dc.contributor.author | Gai, Zheng | pt |
dc.contributor.author | dos Santos, Antonio M. | pt |
dc.date.accessioned | 2017-12-07T19:31:22Z | - |
dc.date.issued | 2013 | pt |
dc.identifier.issn | 0022-4596 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/19979 | - |
dc.description.abstract | Two new alkaline earth copper(II) germanates were hydrothermally synthesized: CaCuGeO4 center dot H2O (1) and BaCu2Ge3O9 center dot H2O (2), and their structures determined by single crystal X-ray diffraction. Compound (1) crystallizes in space group P2(1)/c with a=5.1320(2) angstrom, b=16.1637(5) angstrom, c=5.4818(2) angstrom, beta=102.609(2)degrees, V=443.76(3) angstrom(3) and Z=4. This copper germanate contains layers of composition [CuGeO4](infinity)(2-) comprising CuO4 square planes and GeO4 tetrahedra with calcium and water molecules in the inter-layer space. Compound (2) crystallizes in the Cmcm space group with a=5.5593(3) angstrom, b=10.8606(9) angstrom, c=13.5409(8) angstrom, V=817.56(9) angstrom(3) and Z=4. This structure contains GeO6 and CuO6 octahedra as well as GeO4 tetrahedra, forming a three-dimensional network of interconnecting six-membered ring channels. The magnetic susceptibility for both samples can be interpreted as S=1/2 chains, in agreement with the copper topology observed in the crystal structure. The susceptibility of (1) exhibits a Bonner-Fisher type behavior, resulting from antiferromagnetic intra-chain interactions without three-dimensional ordering down to 5 K-the lowest measured temperature. This observation, together with the absence of super-exchange paths between the copper chains, make this system particularly promising for the study of low dimensional magnetism. The magnetic properties of (2) show a very weak ferromagnetic near-neighbor interaction along the chain. In this compound a peak the chi T plot seems to indicate the onset of interchain antiferromagentic correlations. However, no ordering temperature is detected in the susceptibility data. Published by Elsevier Inc. | pt |
dc.language.iso | eng | pt |
dc.publisher | ACADEMIC PRESS INC ELSEVIER SCIENCE | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876-PPCDTI/72584/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/COMPETE/132936/PT | pt |
dc.rights | restrictedAccess | por |
dc.subject | FRAMEWORK | pt |
dc.subject | BEHAVIOR | pt |
dc.title | Novel alkaline earth copper germanates with ferro and antiferromagnetic S=1/2 chains | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 39 | pt |
degois.publication.lastPage | 44 | pt |
degois.publication.title | JOURNAL OF SOLID STATE CHEMISTRY | pt |
degois.publication.volume | 198 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.relation.publisherversion | 10.1016/j.jssc.2012.09.006 | pt |
dc.identifier.doi | 10.1016/j.jssc.2012.09.006 | pt |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Novel alkaline earth copper germanates with ferro and antiferromagnetic S=12 chains_10.1016j.jssc.2012.09.006.pdf | 757.52 kB | Adobe PDF |
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