Magnetic Susceptibility of UC1-xNxfrom 4° to 1,100°K

Ohmichi, Toshihiko; Nasu, Shōichi; Kikuchi, Takeo

doi:10.1080/18811248.1972.9734790

Cited by 7 publications

(1 citation statement)

References 14 publications

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“…1). It orders antiferromagnetically below the Néel temperature T N = 52 K 5 and neutron diffraction experiments reveal that UN forms an antiferromagnetic type-I (single- k ) structure with an ordered magnetic moment of 0.75 μ B at the uranium site 6 (see upper inset to Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Tricritical point from high-field magnetoelastic and metamagnetic effects in UN

Shrestha

Antonio

Jaime

et al. 2017

Sci Rep

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Uranium nitride (UN) is one of the most studied actinide materials as it is a promising fuel for the next generation of nuclear reactors. Despite large experimental and theoretical efforts, some of the fundamental questions such as degree of 5 f–electron localization/delocalization and its relationship to magneto-vibrational properties are not resolved yet. Here we show that the magnetostriction of UN measured in pulsed magnetic fields up to 65 T and below the Néel temperature is large and exhibits complex behavior with two transitions. While the high field anomaly is a field-induced metamagnetic-like transition and affects both magnetisation and magnetostriction, the low field anomaly does not contribute to the magnetic susceptibility. Our data suggest a change in the nature of the metamagnetic transition from first to second order-like at a tricritical point at T tri ∼ 24 K and H tri ∼ 52 T. The induced magnetic moment at 60 T might suggest that only one subset of magnetic moments has aligned along the field direction. Using the results obtained here we have constructed a magnetic phase diagram of UN. These studies demonstrate that dilatometry in high fields is an effective method to investigate the magneto-structural coupling in actinide materials.

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Section: Introductionmentioning

confidence: 99%

Tricritical point from high-field magnetoelastic and metamagnetic effects in UN

Shrestha

Antonio

Jaime

et al. 2017

Sci Rep

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Critical Composition of Antiferromagnetic Ordering in UNxC1−x

Tamaki

Matsui

Matsumoto

et al. 1983

Phys. Stat. Sol. (a)

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Introductionamagnetic UC (uranium monocarbide) diminishes the magnetic ordering. Three competing results have been reported for the critical composition of the antiferromagnetism of UNxCl-,. De Novion and Costa /1/ suggested the critical composition at x = 0.90 from measurements of the magnetic susceptibility, the specific heat, and the electrical resistivity, whereas Ohmichi et al. /2 to 4/ proposed it at x = 0.40 from the results of magnetic and electric properties of U(N, C). Another critical composition, x = 0.86, was reported by Lander et al. /5/, using a neutron diffraction technique. However, all samples in the above studies were powdered o r sintered which had high porosity,, impurities, and inhomogeneity, thus being away from a precise determination of TN. In the present investigation, w e prepared fused and comparatively pure uranium carbonitrides. Precise measurement of the low-temperature electrical resistivity was carried out with a particular emphasis of the critical composition of the antiferromagnetic ordering in U(N, C).Dilution of antiferromagnetic UN (uranium mononitride) by par-Experimental Solid solutions of uranium carbonitrides with various compositions of non-metal atoms were prepared by melting of UN and UC in a nitrogen plasma jet furnace under suitable gas pressures between 0.05 and 0.5 MPa. The original UN and UC were obtained also by plasma melting /6/. Sliced specimens, 1xlxl5 mm in dimension, were provided for the resistivity measurement. They were annealed at 1300°Cfor 6 h in vacuo before starting the measurement. Material characterizations were done by chemical analysis for metal and non-metals, including oxygen (sd 800 ppm). In addition, an evaluation of the chemical composition was tried using the relation between lattice parameter and (N+C)/N ratio reported by Cordfunke /?/. 3The electrical resistivity was measured in a LHe cryostat in a temperature range between 4 and 100 K, applying the conventional dc four-probe method.1) Furo-cho, Chikusa-ku, Nagoya 464, Japan. K94 physica status solidi (a) 79 b I t La06 t 1 1 I I I I I I I 1 1 0 za LO 60 80 1l N 0 20 LO 60 80 ICU r (K) -Fig. 1. Electrical resistivity and the derivatives (dQ/dT) of a) UN and b) UNo. 94Co. o6 as a function of temperature The measurement was performed at every 0.1 K interval and the data were analyzed by a computer (FACOM 230-60) at the Nagoya University. A Ge thermometer was used for temperature control. E r r o r s of the measured values were within 0.2 p a c m and 0.1 K for the resistivity and the temperature, respectively.Results and discussion The electrical resistivity of pure UN is illustrated in Fig. la, together with the first derivativesof the resistivity with respect to temperature (dQ/dT). In the d@dT versus T plot, a maximumwasobserved a t 44 K. In a previous paper /8/, we found also a maximum in dQ/dT at 47.5 K in UN single crystals, but those were not real magnetic transition points. According to a procedure proposed by van Doorn and du Plessis /9/, the NBel temperatures were determined t o be ...

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Magnetic properties of single-crystal uranium mononitride

Doorn

Plessis²

1977

J Low Temp Phys

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Magnetic Susceptibility of UC_1-xN_xfrom 4° to 1,100°K

Cited by 7 publications

References 14 publications

Tricritical point from high-field magnetoelastic and metamagnetic effects in UN

Tricritical point from high-field magnetoelastic and metamagnetic effects in UN

Critical Composition of Antiferromagnetic Ordering in UNxC1−x

Magnetic properties of single-crystal uranium mononitride

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