Incoherent inelastic and quasielastic neutron scattering with simultaneous neutron diffraction control of phase transitions in [Mg(NH3 )6 ](NO3 )2
Authors:
- A. Belushkin,
- J.A. Janik,
- J.M. Janik,
- B. Janik,
- A. Migdał-Mikuli,
- E. Mikuli,
- I. Natkaniec,
- Jan Wąsicki
Abstract
Neutron diffraction measurements carried out with [Mg(NH3)6](NO3)2 powder showed the existence of three solid phases. Phase I is fcc (Fm3m), phase II is primitive cubic (Pa3) and phase III is perhaps orthorhombic. The phase II → phase III transition occurs at about 110 K on cooling. When heating phase III above this temperature, one obtains a metastable phase III which slowly transforms into phase II. INS measurements showed a group of NH3-torsion peaks both in phase II and phase III instead of a single peak. This indicates a lack of NH3 equivalency. QNS measurements showed that NH3 groups are quickly reorienting in phase I and II. In phases I and II. In phase III four out of the six NH3 groups reorient at a slower rate (outside of the neutron "detection window") but two groups perform still a fast reorientation. © 1985.
- Record ID
- UAM822a9f7ecac14fb99638d5508a94563f
- Author
- Journal series
- Physica B: Physics of Condensed Matter & C: Atomic, Molecular and Plasma Physics, Optics, ISSN 0378-4363
- Issue year
- 1985
- Vol
- 128
- Pages
- 292-296
- ASJC Classification
- DOI
- DOI:10.1016/0378-4363(85)90005-1 Opening in a new tab
- Language
- (en) English
- Score (nominal)
- 0
- Score source
- journalList
- Publication indicators
- = 5; = 6
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- Uniform Resource Identifier
- https://researchportal.amu.edu.pl/info/article/UAM822a9f7ecac14fb99638d5508a94563f/
- URN
urn:amu-prod:UAM822a9f7ecac14fb99638d5508a94563f
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