Low-temperature phase transition in nanostructured MnO embedded within the channels of MCM-41-type matrices

High-resolution x-ray-diffraction experiments of antiferromagnetic MnO nanostructured within the channels of mesoporous MCM-41 matrices reveal an unusual transition from a distorted, trigonal phase to a cubic phase at about 40 K, well below the magnetic transition temperature of 120 K. The disappear...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2006-08, Vol.74 (5), Article 054433
Main Authors: Golosovsky, I. V., Mirebeau, I., Fauth, F., Kurdyukov, D. A., Kumzerov, Yu. A.
Format: Article
Language:English
Subjects:
AMPLITUDES
ANTIFERROMAGNETIC MATERIALS
ANTIFERROMAGNETISM
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
MANGANESE OXIDES
NANOSTRUCTURES
PHASE TRANSFORMATIONS
RESOLUTION
SOLIDS
STRESSES
TEMPERATURE DEPENDENCE
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
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Summary:High-resolution x-ray-diffraction experiments of antiferromagnetic MnO nanostructured within the channels of mesoporous MCM-41 matrices reveal an unusual transition from a distorted, trigonal phase to a cubic phase at about 40 K, well below the magnetic transition temperature of 120 K. The disappearance of the structural distortion is accompanied by an increase of the unit-cell parameter, amplitude of atomic motion, and the appearance of inner stresses. Such behavior drastically differs from the behavior known for the bulk compound.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.74.054433