|
Title
|
|
|
|
Interplay of structural chemistry and magnetism in perovskites : a study of : Ln=La, Pr, Nd
| |
|
Author
|
|
|
|
| |
|
Abstract
|
|
|
|
| Polycrystalline samples of CaLn(2)Ni(2)WO(9) (Ln=La, Pr, Nd) have been synthesized and characterised by a combination of X-ray and neutron diffraction, electron microscopy and magnetometry. Each composition adopts a perovskite-like structure with a similar to 5.50, b similar to 5.56, c similar to 7.78 angstrom beta similar to 90.1 degrees in space group P2(1)/n. Of the two crystallographically distinct six-coordinate sites, one is occupied entirely (Ln=Pr) or predominantly (Ln=La, Nd) by Ni2+ and the other by Ni2+ and W6+ in a ratio of approximately 1:2. None of the compounds shows long-range magnetic order at 5 K. The magnetometry data show that the magnetic moments of the Ni2+ cations form a spin glass below 30 K in each case. The Pr3+ moments in CaPr2Ni2WO9 also freeze but the Nd3+ moments in CaNd2Ni2WO9 do not. This behaviour is contrasted with that observed in other (A,A')B2B'O-9 perovskites. |
| |
|
Language
|
|
|
|
English
| |
|
Source (journal)
|
|
|
|
Journal of solid state chemistry. - London
| |
|
Publication
|
|
|
|
London
:
2017
| |
|
ISSN
|
|
|
|
0022-4596
| |
|
DOI
|
|
|
|
10.1016/J.JSSC.2017.04.023
| |
|
Volume/pages
|
|
|
|
251
(2017)
, p. 224-232
| |
|
ISI
|
|
|
|
000402581200030
| |
|
Full text (Publisher's DOI)
|
|
|
|
| |
|
Full text (open access)
|
|
|
|
| |
|