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Comparative Study of the Layered Perovskites Pr 1− x A 1+ x CoO 4 , (A = Sr, Ca)
Author(s) -
Hassen Arafa,
Krimmel Alexander,
Mandal Prabhat
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13172
Subject(s) - paramagnetism , rietveld refinement , crystallography , electrical resistivity and conductivity , perovskite (structure) , crystal structure , variable range hopping , magnetic susceptibility , materials science , space group , x ray crystallography , powder diffraction , diffraction , magnetic structure , chemistry , condensed matter physics , magnetization , physics , magnetic field , quantum mechanics , optics
We present structural, magnetic, and electric properties of Pr 1− x Ca 1+ x CoO 4 layered perovskites and compare them with the results of recently studied Pr 1− x Sr 1+ x CoO 4 . The Rietveld refinements of X‐ray powder diffraction (XRD) patterns indicate that all samples crystallize in the K 2 NiF 4 ‐type structure with space group symmetry I 4/ mmm . The parent compounds Pr(Ca, Sr)CoO 4 are paramagnetic insulators. Upon increasing x , a variety of different magnetic transitions can be identified. The complex magnetic behavior results from the interplay of competing interactions. The temperature‐dependent electrical resistivity of the samples shows 2D variable range hopping (2D‐VRH). The results are discussed with respect to structure−property relationships.