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The synthesis, structural characterization and magnetic properties of compounds in the Ln2O3–SrO–NiO–CuO system for Ln=La, Nd, Gd, Dy, Ho and Er
- Source :
-
Journal of Alloys & Compounds . Apr2007, Vol. 431 Issue 1/2, p16-22. 7p. - Publication Year :
- 2007
-
Abstract
- Abstract: An investigation of the quaternary Ln2O3–SrO–NiO–CuO system has shown that compounds of the formula Ln2−x Sr x Ni0.8Cu0.2O4−δ (0< x <2) with Ln=La, Nd and Gd adopt the K2NiF4-type structure, but a new phase of stoichiometric composition is formed only at x =1.67 (LnSr5Ni2.4Cu0.6O11) with the smaller lanthanides cations Dy, Ho and Er. All the samples have been prepared at 1150°C in 1atm of O2 gas flow using conventional solid state methods. Rietveld refinement of their crystal structures from powder X-ray diffraction data confirms that they adopt the tetragonal structure (space group I4/mmm, Z =2). Magnetic susceptibility data for Ln2−x Sr x Ni0.8Cu0.2O4−δ (0< x <2) with Ln=La, Nd, Gd, Dy, Ho and Er between 2 and 350K show Curie–Weiss behavior at higher temperatures characteristic of Ln3+ cation. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 431
- Issue :
- 1/2
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 24247038
- Full Text :
- https://doi.org/10.1016/j.jallcom.2006.05.051