25-K phase transition in NpO/sub 2/ from /sup 237/Np Moessbauer spectroscopy
Journal Article
·
· Phys. Rev. B: Condens. Matter; (United States)
/sup 237/Np Moessbauer spectroscopy in magnetic external fields up to 8 T and in the temperature range 1.5--160 K, demonstrates that NpO/sub 2/ remains paramagnetic well below T/sub c/ = 25 K. The specific-heat anomaly, the cusp in magnetic susceptibility, and the changes in the shape of the Moessbauer spectra observed at 25 K are attributed to a structural transition. Both the bulk susceptibility and the Moessbauer data can be satisfactorily reproduced under the assumption of an inhomogeneous compressional-expansional internal distortion of the oxygen sublattice. It is suggested that a magnetic ordering of NpO/sub 2/ is prevented (or at least depressed) by this competitive structural transition.
- Research Organization:
- Centre de Recherches Nucleaires, 67037 Strasbourg Cedex, France
- OSTI ID:
- 5625644
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 32:1; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
Similar Records
High-field susceptibility in ferromagnetic NpOs$sub 2$
Moessbauer spectra of Np(V)--Cr(III) and Np(V)--Rh(III) complexes
Crystal chemistry and /sup 237/Np Mossbauer investigations on neptunium oxide chalcogenides NpOS and NpOSe
Conference
·
Tue Dec 31 23:00:00 EST 1974
· AIP (Am. Inst. Phys.) Conf. Proc., no. 24, pp. 351-352
·
OSTI ID:4162440
Moessbauer spectra of Np(V)--Cr(III) and Np(V)--Rh(III) complexes
Conference
·
Fri Dec 31 23:00:00 EST 1976
·
OSTI ID:7087535
Crystal chemistry and /sup 237/Np Mossbauer investigations on neptunium oxide chalcogenides NpOS and NpOSe
Journal Article
·
Sat Jun 01 00:00:00 EDT 1985
·
OSTI ID:6464399
Related Subjects
36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ACTINIDE COMPOUNDS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
CHALCOGENIDES
HEAVY NUCLEI
ISOTOPES
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETISM
MOESSBAUER EFFECT
NEPTUNIUM 237
NEPTUNIUM COMPOUNDS
NEPTUNIUM ISOTOPES
NEPTUNIUM OXIDES
NUCLEI
ODD-EVEN NUCLEI
ORDER-DISORDER TRANSFORMATIONS
OXIDES
OXYGEN COMPOUNDS
PARAMAGNETISM
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RADIOISOTOPES
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
TRANSURANIUM COMPOUNDS
YEARS LIVING RADIOISOTOPES
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ACTINIDE COMPOUNDS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
CHALCOGENIDES
HEAVY NUCLEI
ISOTOPES
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETISM
MOESSBAUER EFFECT
NEPTUNIUM 237
NEPTUNIUM COMPOUNDS
NEPTUNIUM ISOTOPES
NEPTUNIUM OXIDES
NUCLEI
ODD-EVEN NUCLEI
ORDER-DISORDER TRANSFORMATIONS
OXIDES
OXYGEN COMPOUNDS
PARAMAGNETISM
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RADIOISOTOPES
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
TRANSURANIUM COMPOUNDS
YEARS LIVING RADIOISOTOPES