|
Title
|
|
|
|
Structures and magnetism of () phases
|
|
|
Author
|
|
|
|
|
|
|
Abstract
|
|
|
|
| Topotactic reduction of La1-xSrxMnO3 (0.67 <= x <= 1) phases with sodium hydride yields a series of isoelectronic materials of composition La1-xSrxMnO3-(0.5+x)/2. Lanthanum rich members of the series (0.67 <= x <= 0.83) adopt anion deficient perovskite structures with a 6-layer -OTOOT'O- stacking sequence of sheets of octahedra/square-based pyramids (O) and sheets of tetrahedra (T). The strontium rich members of the series (0.83 <= x <= 1) incorporate "step defects" into this 6-layer structure in which the OTOOT'O stacking sequence is converted into either OOTOOT' or TOOT'OO at a defect plane which runs perpendicular to the [201] lattice plane. The step defects appear to provide a mechanism to relieve lattice strain and accommodate additional anion deficiency in phases with x > 0.83. Magnetization and neutron diffraction data indicate La1-xSrxMnO3-(0.5+x)/2 phases adopt antiferromagnetically ordered states at low-temperature in which the ordered arrangement of magnetic spins is incommensurate with the crystallographic lattice. |
|
|
|
Language
|
|
|
|
English
|
|
|
Source (journal)
|
|
|
|
Chemistry of materials / American Chemical Society. - Washington, D.C., 1989, currens
|
|
|
Publication
|
|
|
|
Washington, D.C.
:
2012
|
|
|
ISSN
|
|
|
|
0897-4756
[print]
1520-5002
[online]
|
|
|
DOI
|
|
|
|
10.1021/CM300199B
|
|
|
Volume/pages
|
|
|
|
24
:8
(2012)
, p. 1486-1495
|
|
|
ISI
|
|
|
|
000303092300011
|
|
|
Full text (Publisher's DOI)
|
|
|
|
|
|