Citation
K. Ramesha et al., ALaMnBO(6) (A = Ca, Sr, Ba; B = Fe, Ru) double perovskites, MATER RES B, 35(4), 2000, pp. 559-565
Citations number
17
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
MATERIALS RESEARCH BULLETIN
ISSN journal
00255408
→ ACNP
Volume
35
Issue
4
Year of publication
2000
Pages
559 - 565
Database
ISI
SICI code
0025-5408(20000301)35:4<559:A(=CSB>2.0.ZU;2-4
Abstract
We report the synthesis and investigation of electrical and magnetic proper
ties of double perovskites of the formula ALaMnBO(6) for A = Ca, Sr, Ba and
B = Fe, Ru. Powder X-ray diffraction (XRD) shows formation of cubic/pseudo
cubic perovskite structure for all the phases, with no obvious long-range o
rdering of B-site cations. Electron diffraction, however, reveals an orderi
ng of Mn and Ru in ALaMnRuO(6), showing a doubling of the primitive cubic p
erovskite cell. While the B = Fe phases are paramagnetic insulators, the B
= Ru phases are ferrimagnetic semiconductors. It is likely that in the B =
Ru phases, a valence equilibrium exists between Mn-III/Ru-IV and Mn-II/Ru-V
states that is biased toward the latter. (C) 2000 Elsevier Science Ltd. Al
l rights reserved.