Magnetic properties of La{sub 2}NiO{sub 4.16} and La{sub 2{minus}x}Pr{sub x}NiO{sub 4+{delta}}

Journal Article · Wed Jul 01 04:00:00 EDT 1998 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1998.7781· OSTI ID:651120

Poirot, N J; Allancon, Ch; Odier, P; Simon, P; Bassat, J M; Loup, J P ^[1]

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1. CNRS, Orleans (France). Centre de Recherches sur la Physique des Hautes Temperatures

Magnetic properties of La{sub 2}NiO{sub 4.16} and La{sub 2{minus}x}Pr{sub x}NiO{sub 4+{delta}} are studied by dc susceptibility in a wide temperature range, i.e., 4--1,200 K. The principal aim is to investigate the modifications of magnetic interactions in the NiO{sub 2} plane by inserting a magnetic ion in the LaO layer. Magnetic properties are considerably different with and without praseodymium. When 0 < x {le} 2 the solid solution follows the Curie-Weiss law and the Curie constant varies linearly with x. For x = 0, the susceptibility is smaller and another contribution appears above 200 K that is treated as the result of clusters of AF-coupled spins of two-dimensional character. The model fits very well the data from 4 to 1,000 K. Comparing the Curie-Weiss temperature with and without Pr suggests that small Pr quantities modify the in-plane Ni-O-Ni magnetic interactions and, thus, decrease the Curie-Weiss temperature. The authors think this is not a structural effect; it might correlate with an increased resistivity when Pr is substituted. For larger substitution, i.e., x > 0.5, a single Pr{sup 3+} effect might dominate.

• OSTI ID: 651120
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 138; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CURIE-WEISS LAW
EXPERIMENTAL DATA
LANTHANUM OXIDES
MAGNETIC PROPERTIES
NICKEL OXIDES
PRASEODYMIUM OXIDES
SOLID SOLUTIONS
TEMPERATURE DEPENDENCE