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Author Ottmann, A. ♦ Jähne, C. ♦ Meyer, H. -P. ♦ Klingeler, R.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ ANTIFERROMAGNETISM ♦ CONCENTRATION RATIO ♦ COVALENCE ♦ ELECTROCHEMISTRY ♦ ELECTRONEGATIVITY ♦ LATTICE PARAMETERS ♦ LITHIUM COMPOUNDS ♦ MAGNETIC PROPERTIES ♦ MAGNETIZATION ♦ MANGANESE IONS ♦ MANGANESE PHOSPHATES ♦ MICROWAVE RADIATION ♦ NANOMATERIALS ♦ NICKEL COMPOUNDS ♦ NICKEL IONS ♦ ORTHORHOMBIC LATTICES ♦ PARAMAGNETISM ♦ SOLID SOLUTIONS ♦ X-RAY DIFFRACTION
Abstract Highlights: • LiMn{sub 1−x}Ni{sub x}PO{sub 4} nanomaterials were synthesised via a hydrothermal route up to x = 0.45. • Structure and elemental analyses show solid solution behaviour obeying Vegard's law. • Magnetic properties reflect the substitution of Mn{sup 2+} by Ni{sup 2+}. • Mn{sup 2+/3+} reduction potential rises with increasing nickel concentration. - Abstract: A solid solutions series of LiMn{sub 1−x}Ni{sub x}PO{sub 4} nanomaterials with 0 ≤ x ≤ 0.45 was produced by a low-temperature microwave-assisted hydrothermal process. The materials have been systematically studied regarding structure, morphology, magnetism, and electrochemical properties. The lattice parameters in the orthorhombic olivine structure obey Vegard's law and linearly depend on x. Similarly, the static magnetisation reflects the decrease of the transition metal paramagnetic moment upon substitution of Mn{sup 2+} by Ni{sup 2+}. At low temperatures, antiferromagnetic long range order appears for all Ni-concentrations. The potential of the Mn{sup 2+/3+} redox couple is found to linearly increase with x. This is explained by a larger electronegativity of Ni{sup 2+} as compared to Mn{sup 2+} and associated changes in the covalency of the Mn-O bond.
ISSN 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-03-15
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 63


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