Structural, magnetic, and electrochemical properties of LiMn{sub 1−x}Ni{sub x}PO{sub 4}

Journal Article · Sun Mar 15 00:00:00 EDT 2015 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2014.11.008· OSTI ID:22420821

Jähne, C. ^[1]; Meyer, H. -P. ^[2]; Klingeler, R. ^[1]

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1. Kirchhoff Institute for Physics, Heidelberg University, 69120 Heidelberg (Germany)
2. Institute of Earth Sciences, Heidelberg University, 69120 Heidelberg (Germany)

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.

• OSTI ID: 22420821
• Journal Information: Materials Research Bulletin, Vol. 63; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 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