Structural evolution in iron tellurates
- Institut Europeen des Membranes, UMR 5635, cc 047 Universite de Montpellier II, 34095 Montpellier (France)
- Laboratoire de Chimie Moleculaire et Organisation du Solide, UMR 5253, cc 007 Universite de Montpellier II, 34095 Montpellier (France)
Three new members within the iron tellurate family have been synthesized and characterized by single-crystal diffraction. Fe{sub 2}Te{sub 3}O{sub 9} is orthorhombic, a=7.80240(10)A, b=17.7501(3)A, c=5.28050(10)A, Z=4, space group Pnma, final agreement factors R{sub 1}=0.0261(wR{sub 2}=0.0688) for 1271 independent reflections. Fe{sub 3}Te{sub 4}O{sub 12} is monoclinic, a=9.1312(2)A, b=7.3554(2)A, c=15.7379(3)A, {beta}=107.950(10){sup o}, Z=4, space group P2{sub 1}/c, final agreement factors R{sub 1}=0.0380(wR{sub 2}=0.0281) for 3302 independent reflections. FeTe{sub 6}O{sub 13} is trigonal, a=b=10.16630(10)A, c=18.9330(3)A, Z=6, space group R3-barm, final agreement factors R{sub 1}=0.0309(wR{sub 2}=0.0641) for 1264 independent reflections. Together with the four already known members of the family, Fe{sub 2}TeO{sub 5}, Fe{sub 2}TeO{sub 6}, and Fe{sub 2}Te{sub 3}O{sub 9} (a dimorphic variant of the afore-mentioned structure with the same chemical formula), and Fe{sub 2}Te{sub 4}O{sub 11}, the iron tellurates now span from relatively Fe-rich and Te-poor to relatively Fe-poor to Te-rich compounds. The structural diversity within Fe-Te-O system is discussed in terms of the lone-pair stereochemistry of the Te{sup 4+} anion and the cross-over from Fe{sup 3+} to mixed-valence Fe{sup 3+}/Fe{sup 2+} and Fe{sup 2+} coordination polyhedra compounds.
- OSTI ID:
- 21015771
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 4 Vol. 180; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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