Structural, thermal, magnetic and electrical studies of the iron oxophosphate Rb{sub 7}Fe{sub 7}(PO{sub 4}){sub 8}O{sub 2}.2H{sub 2}O
Abstract
A new iron oxophosphate of composition Rb{sub 7}Fe{sub 7}(PO{sub 4}){sub 8}O{sub 2}.2H{sub 2}O has been synthesized and studied by X-ray diffraction, TG and DTA analysis, magnetic susceptibility, neutron diffraction, Moessbauer spectroscopy and ionic conductivity. This compound crystallizes in the monoclinic system with the P2{sub 1}/c space group and the unit cell parameters a = 8.224(8) A, b = 22.162(6) A, c = 9.962(6) A and {beta} = 109.41(8){sup o}. Its structure is built up from Fe{sub 7}O{sub 32} clusters of edge- and corner-sharing FeO{sub 5} and FeO{sub 6} polyhedra. Neighboring clusters are connected by the phosphate tetrahedra to form a three-dimensional framework. The Rb{sup +} cations and the water molecules are occupying intersecting tunnels parallel to a and c. The presence of water molecules was confirmed by TG and DTA analysis. The magnetic susceptibility measurements have shown the existence of antiferromagnetic ordering below 22 K with a weak ferromagnetic component. Additionally, these measurements show evidence for a strong magnetic frustration characterized by |{theta}/T{sub N}| {approx} 12. Powder neutron diffraction study confirms the presence of a long range antiferromagnetic order coupled to a weak ferromagnetic component along the b-axis. The strongly reduced magnetic moments extracted from the refinement support the existencemore »
- Authors:
-
- UR Materiaux Inorganiques, Faculte des Sciences, 5019, rue de l'environnement, Monastir (Tunisia)
- CNRS, Universite de Bordeaux, ICMCB, 87 avenue du Dr. A. Schweitzer, Pessac, F-33608 (France)
- ILL, Diffraction Group, BP 156, 6 rue Jules Horowitz, 38042, Grenoble Cedex 9 (France)
- Departamento de Quimica Inorganica I, Facultad de Ciencias Quimicas, Universidad Complutense, 28040 Madrid (Spain)
- Publication Date:
- OSTI Identifier:
- 22207384
- Resource Type:
- Journal Article
- Journal Name:
- Materials Research Bulletin
- Additional Journal Information:
- Journal Volume: 45; Journal Issue: 9; Other Information: Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; ACTIVATION ENERGY; ANTIFERROMAGNETISM; CATIONS; DIFFERENTIAL THERMAL ANALYSIS; IRON IONS; IRON OXIDES; MAGNETIC MOMENTS; MAGNETIC SUSCEPTIBILITY; MOESSBAUER EFFECT; MONOCLINIC LATTICES; NEUTRON DIFFRACTION; POWDERS; RUBIDIUM IONS; RUBIDIUM PHOSPHATES; SPACE GROUPS; SPECTROSCOPY; X-RAY DIFFRACTION
Citation Formats
Hidouri, Mourad, Lajmi, Besma, Gmati, Nadia, Wattiaux, Alain, Nenert, Gwilherm, Ritter, Clemens, Fournes, Leopold, Darriet, Jacques, Lopez, Maria Luisa, Pico, Carlos, and Amara, Mongi B. Structural, thermal, magnetic and electrical studies of the iron oxophosphate Rb{sub 7}Fe{sub 7}(PO{sub 4}){sub 8}O{sub 2}.2H{sub 2}O. United States: N. p., 2010.
Web. doi:10.1016/J.MATERRESBULL.2010.05.008.
Hidouri, Mourad, Lajmi, Besma, Gmati, Nadia, Wattiaux, Alain, Nenert, Gwilherm, Ritter, Clemens, Fournes, Leopold, Darriet, Jacques, Lopez, Maria Luisa, Pico, Carlos, & Amara, Mongi B. Structural, thermal, magnetic and electrical studies of the iron oxophosphate Rb{sub 7}Fe{sub 7}(PO{sub 4}){sub 8}O{sub 2}.2H{sub 2}O. United States. https://doi.org/10.1016/J.MATERRESBULL.2010.05.008
Hidouri, Mourad, Lajmi, Besma, Gmati, Nadia, Wattiaux, Alain, Nenert, Gwilherm, Ritter, Clemens, Fournes, Leopold, Darriet, Jacques, Lopez, Maria Luisa, Pico, Carlos, and Amara, Mongi B. 2010.
"Structural, thermal, magnetic and electrical studies of the iron oxophosphate Rb{sub 7}Fe{sub 7}(PO{sub 4}){sub 8}O{sub 2}.2H{sub 2}O". United States. https://doi.org/10.1016/J.MATERRESBULL.2010.05.008.
@article{osti_22207384,
title = {Structural, thermal, magnetic and electrical studies of the iron oxophosphate Rb{sub 7}Fe{sub 7}(PO{sub 4}){sub 8}O{sub 2}.2H{sub 2}O},
author = {Hidouri, Mourad and Lajmi, Besma and Gmati, Nadia and Wattiaux, Alain and Nenert, Gwilherm and Ritter, Clemens and Fournes, Leopold and Darriet, Jacques and Lopez, Maria Luisa and Pico, Carlos and Amara, Mongi B.},
abstractNote = {A new iron oxophosphate of composition Rb{sub 7}Fe{sub 7}(PO{sub 4}){sub 8}O{sub 2}.2H{sub 2}O has been synthesized and studied by X-ray diffraction, TG and DTA analysis, magnetic susceptibility, neutron diffraction, Moessbauer spectroscopy and ionic conductivity. This compound crystallizes in the monoclinic system with the P2{sub 1}/c space group and the unit cell parameters a = 8.224(8) A, b = 22.162(6) A, c = 9.962(6) A and {beta} = 109.41(8){sup o}. Its structure is built up from Fe{sub 7}O{sub 32} clusters of edge- and corner-sharing FeO{sub 5} and FeO{sub 6} polyhedra. Neighboring clusters are connected by the phosphate tetrahedra to form a three-dimensional framework. The Rb{sup +} cations and the water molecules are occupying intersecting tunnels parallel to a and c. The presence of water molecules was confirmed by TG and DTA analysis. The magnetic susceptibility measurements have shown the existence of antiferromagnetic ordering below 22 K with a weak ferromagnetic component. Additionally, these measurements show evidence for a strong magnetic frustration characterized by |{theta}/T{sub N}| {approx} 12. Powder neutron diffraction study confirms the presence of a long range antiferromagnetic order coupled to a weak ferromagnetic component along the b-axis. The strongly reduced magnetic moments extracted from the refinement support the existence of a magnetically frustrated ground state. The Moessbauer spectroscopy results confirmed the presence of only Fe{sup 3+} ions in both five and six coordination. The ionic conductivity measurements led to activation energy of 0.81 eV, a value that agrees with the obtained for other rubidium phosphates.},
doi = {10.1016/J.MATERRESBULL.2010.05.008},
url = {https://www.osti.gov/biblio/22207384},
journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 9,
volume = 45,
place = {United States},
year = {Wed Sep 15 00:00:00 EDT 2010},
month = {Wed Sep 15 00:00:00 EDT 2010}
}