Magnetic and crystal structure determination of K[sub 2]UBr[sub 5]

Journal Article · Mon Mar 01 04:00:00 EST 1993 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1006/jssc.1993.1087· OSTI ID:6134884

Kraemer, K ^[1]; Keller, L; Fischer, P ^[2]; Jung, B; Edelstein, N N ^[3]; Guedel, H U ^[4]; Meyer, G ^[5]

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1. Universitaet Hannover (Germany) Universitaet Bern (Switzerland)
2. Eidgenoessische Technische Hochschule Zuerich, Villigen (Switzerland)
3. Lawrence Berkeley Lab., CA (United States)
4. Universitaet Bern (Switzerland)
5. Universitaet Hannover (Germany)

Magnetic susceptibility measurements show an antiferromagnetic ordering phenomenon for K[sub 2]UBr[sub 5]. There is a broad maximum in the [chi] versus T curve at about 10 K. Aiming at the determination of the magnetic structure of K[sub 2]UBr[sub 5], powder neutron diffraction investigations were performed. The nuclear structure of K[sub 2]UBr[sub 5](K[sub 2]PrCl[sub 5] type of structure) was refined at 15 K in the paramagnetic state. The magnetic structure, which was determined from a measurement at 1.5 K in the magnetically ordered state, belongs to the Shubnikov space group Pn[prime]m[prime]a[prime] with k = 0. In the uranium chains along [010] there is an antiferromagnetic ordering of the magnetic moments with components in the (010) plane only. The magnetic moments of neighboring chains are perpendicular to each other within the error limit. Each U[sup 3+] has an ordered magnetic moment of 2.31(4) [mu][sub B]. According to the temperature dependence of the intensity of the 010 and 111 magnetic peaks the Neel temperature is 2.8(3) K. Presumably, there is a short-range magnetic ordering along the [UBr[sub 3]Br[sub 4/2]][sup 2[minus]] chains giving rise to the maximum of [chi] at T = 10 K, followed by long-range (three-dimensional) ordering at 2.8 K. 19 refs., 5 figs., 3 tabs.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6134884
• Journal Information: Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 103:1; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ACTINIDE COMPOUNDS
ALKALI METAL COMPOUNDS
BROMIDES
BROMINE COMPOUNDS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
HALIDES
HALOGEN COMPOUNDS
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MILLER INDICES
NEEL TEMPERATURE
NEUTRON DIFFRACTION
NUCLEAR STRUCTURE
PEAKS
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
SCATTERING
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
URANIUM BROMIDES
URANIUM COMPOUNDS