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Title: Structural and magnetic properties of Nd{sub 18}Li{sub 8}Co{sub 4-x}Fe{sub x}O{sub 39-y} and Nd{sub 18}Li{sub 8}Co{sub 4-x}Ti{sub x}O{sub 39-y}

Abstract

Nd{sub 18}Li{sub 8}Co{sub 3}FeO{sub 39-y}, Nd{sub 18}Li{sub 8}CoFe{sub 3}O{sub 39-y} and Nd{sub 18}Li{sub 8}Co{sub 3}TiO{sub 39-y} have been synthesised and characterised by neutron powder diffraction, magnetometry and Moessbauer spectroscopy. Their cubic structure (Pm3-bar n, a{approx}11.9 A) is based on intersecting <1 1 1> chains comprised of alternating octahedral and trigonal-prismatic coordination sites. These chains lie within hexagonal-prismatic cavities formed by a Nd-O framework. Each compound has an incomplete oxide sublattice (y{approx}1), with vacancies located around the octahedral sites that lie at the points of chain intersection. These sites are fully occupied by a disordered arrangement of transition-metal cations but only 75% of the remaining octahedral sites are occupied. The trigonal-prismatic sites are fully occupied by lithium except in the case of Nd{sub 18}Li{sub 8}CoFe{sub 3}O{sub 39-y} where some iron is present. Antiferromagnetic interactions are present on the Nd sublattice in each composition, but a spin glass forms below 5 K when a high concentration of spins is also present on the octahedral sites. - Graphical Abstract: Cation and anion vacancies are found to coexist in mixed-metal oxides that adopt the La{sub 18}Li{sub 8}Rh{sub 5}O{sub 39} structure. Highlights: > Coexistence of anion and cation vacancies in compounds adopting the La{sub 18}Li{submore » 8}Rh{sub 5}O{sub 39} structure. > Variation of the degree of magnetic frustration with the chemical composition in the La{sub 18}Li{sub 8}Rh{sub 5}O{sub 39} structure. > Controlling influence of the magnetic properties of the lanthanide cation becomes clear.« less

Authors:
 [1];  [1];  [2];  [3]; ;  [1]
  1. Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QR (United Kingdom)
  2. Faculty of Sciences, University of Liege, B-4000 Sart-Tilman (Belgium)
  3. Department of Chemistry, Missouri University of Science and Technology, University of Missouri, Rolla, Missouri 65409-0010 (United States)
Publication Date:
OSTI Identifier:
21580244
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 184; Journal Issue: 9; Other Information: DOI: 10.1016/j.jssc.2011.07.020; PII: S0022-4596(11)00398-7; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ANTIFERROMAGNETISM; CATIONS; CHAINS; CHEMICAL COMPOSITION; CUBIC LATTICES; MAGNETIC PROPERTIES; MOESSBAUER EFFECT; NEUTRON DIFFRACTION; RARE EARTHS; SPIN GLASS STATE; CHARGED PARTICLES; COHERENT SCATTERING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DIFFRACTION; ELEMENTS; IONS; MAGNETISM; METALS; PHYSICAL PROPERTIES; SCATTERING

Citation Formats

Battle, Peter D., E-mail: peter.battle@chem.ox.ac.uk, Dutton, Sian E., Grandjean, Fernande, Long, Gary J., Thammajak, Nirawat, and Wisetsuwannaphum, Sirikarn. Structural and magnetic properties of Nd{sub 18}Li{sub 8}Co{sub 4-x}Fe{sub x}O{sub 39-y} and Nd{sub 18}Li{sub 8}Co{sub 4-x}Ti{sub x}O{sub 39-y}. United States: N. p., 2011. Web. doi:10.1016/j.jssc.2011.07.020.
Battle, Peter D., E-mail: peter.battle@chem.ox.ac.uk, Dutton, Sian E., Grandjean, Fernande, Long, Gary J., Thammajak, Nirawat, & Wisetsuwannaphum, Sirikarn. Structural and magnetic properties of Nd{sub 18}Li{sub 8}Co{sub 4-x}Fe{sub x}O{sub 39-y} and Nd{sub 18}Li{sub 8}Co{sub 4-x}Ti{sub x}O{sub 39-y}. United States. doi:10.1016/j.jssc.2011.07.020.
Battle, Peter D., E-mail: peter.battle@chem.ox.ac.uk, Dutton, Sian E., Grandjean, Fernande, Long, Gary J., Thammajak, Nirawat, and Wisetsuwannaphum, Sirikarn. Thu . "Structural and magnetic properties of Nd{sub 18}Li{sub 8}Co{sub 4-x}Fe{sub x}O{sub 39-y} and Nd{sub 18}Li{sub 8}Co{sub 4-x}Ti{sub x}O{sub 39-y}". United States. doi:10.1016/j.jssc.2011.07.020.
@article{osti_21580244,
title = {Structural and magnetic properties of Nd{sub 18}Li{sub 8}Co{sub 4-x}Fe{sub x}O{sub 39-y} and Nd{sub 18}Li{sub 8}Co{sub 4-x}Ti{sub x}O{sub 39-y}},
author = {Battle, Peter D., E-mail: peter.battle@chem.ox.ac.uk and Dutton, Sian E. and Grandjean, Fernande and Long, Gary J. and Thammajak, Nirawat and Wisetsuwannaphum, Sirikarn},
abstractNote = {Nd{sub 18}Li{sub 8}Co{sub 3}FeO{sub 39-y}, Nd{sub 18}Li{sub 8}CoFe{sub 3}O{sub 39-y} and Nd{sub 18}Li{sub 8}Co{sub 3}TiO{sub 39-y} have been synthesised and characterised by neutron powder diffraction, magnetometry and Moessbauer spectroscopy. Their cubic structure (Pm3-bar n, a{approx}11.9 A) is based on intersecting <1 1 1> chains comprised of alternating octahedral and trigonal-prismatic coordination sites. These chains lie within hexagonal-prismatic cavities formed by a Nd-O framework. Each compound has an incomplete oxide sublattice (y{approx}1), with vacancies located around the octahedral sites that lie at the points of chain intersection. These sites are fully occupied by a disordered arrangement of transition-metal cations but only 75% of the remaining octahedral sites are occupied. The trigonal-prismatic sites are fully occupied by lithium except in the case of Nd{sub 18}Li{sub 8}CoFe{sub 3}O{sub 39-y} where some iron is present. Antiferromagnetic interactions are present on the Nd sublattice in each composition, but a spin glass forms below 5 K when a high concentration of spins is also present on the octahedral sites. - Graphical Abstract: Cation and anion vacancies are found to coexist in mixed-metal oxides that adopt the La{sub 18}Li{sub 8}Rh{sub 5}O{sub 39} structure. Highlights: > Coexistence of anion and cation vacancies in compounds adopting the La{sub 18}Li{sub 8}Rh{sub 5}O{sub 39} structure. > Variation of the degree of magnetic frustration with the chemical composition in the La{sub 18}Li{sub 8}Rh{sub 5}O{sub 39} structure. > Controlling influence of the magnetic properties of the lanthanide cation becomes clear.},
doi = {10.1016/j.jssc.2011.07.020},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 9,
volume = 184,
place = {United States},
year = {2011},
month = {9}
}