Compounds of thorium with transition metals. II. Systems with iron, cobalt and nickel

Florio, John V.; Baenziger, N. C.; Rundle, R. E.

doi:10.1107/s0365110x5600108x

Cited by 194 publications

(73 citation statements)

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“…The X-ray powder diffraction analysis confirmed the hexagonal crystal structure of the Th 2 Ni 17 -type [11] for all Lu 2 Co 17−x Si x compounds within the homogeneity range (x = 0-3.4). Alloys with x ≥ 3.4 were found to be multiphase.…”

Section: Resultsmentioning

confidence: 68%

Magnetic Anisotropy of Lu₂Co_17-xSi_xSingle Crystals

et al. 2008

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Magnetic anisotropy of Lu 2 Co 17−x Si x single crystals grown by the Czochralski method was investigated. The homogeneity range of Si substitution for Co extends up to x = 3.4 in Lu2Co17−xSix solid solutions. The unit cell volume, Curie temperature, and spontaneous magnetic moment decrease monotonously with increasing Si content. Lu2Co17 has the easyplane type of magnetic anisotropy in the ground state, which changes into the easy-axis type by two spin-reorientation transitions of the second-order, the easy-plane-easy-cone at T SR1 ∼ 680 K and the easy-cone -easy-axis at TSR2 ∼ 730 K. Upon Si substitution, the observed spin-reorientations shift towards the lower temperatures for Lu 2 Co 17−x Si x (T SR1 ∼ 75 K and TSR2 ∼ 130 K in Lu2Co16Si) and vanish for compounds with 1 < x ≤ 3.4, which have the uniaxial type of magnetic anisotropy in the whole temperature range of magnetic order. ) and Gd 3+ (Gd does not contribute to anisotropy) give information on the Co sublattice anisotropy and its changes upon partial substitution by a third M element. Previous investigations with Si were carried out on polycrystalline samples; however, single crystals are strongly desirable for the magnetic anisotropy investigations. The presence of the spontaneous spin-reorientation transitions (SRT) from the easy-plane to the easy-axis was reported in [4,6,7] along with the change of the MA type upon Si substitution for compounds with Y and Gd, whereas Ce 2 Co 17−x Si x compounds were found to be uniaxial for all Si content. There are some works dedicated to the study of magnetic anisotropy of Lu 2 Co 17 single

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Section: Resultsmentioning

confidence: 68%

Magnetic Anisotropy of Lu₂Co_17-xSi_xSingle Crystals

et al. 2008

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“…The phase ThNi is known to exist with its own structure type (Florio, Baenziger & Rundle, 1956). This compound has the same space group and number of atoms per cell as SrAg and very similar c/b and a/c lattice-constant ratios, but different atomic positions and coordination.…”

Section: Sragmentioning

confidence: 99%

The structures of α-CaCu, β-CaCu, SrAg and BaAg: four different stacking variants based on noble-metal-centred trigonal prisms

Merlo¹,

Fornasini²

1981

Acta Crystallogr Sect B

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“…and FeliTh2, which are based on the well-known D2d (CaZns) structure (7). There is also a striking resemblance between the pseudo-orthorhombic cell, which it is possible t o choose for PdbAs, namely a = 7.72 A. b = 16.64 A, c = 5.51 ,k, and / 3 = 90°25', and the orthorhombic cell of PBr5 with a = 8.…”

Section: The Pdaas Phasementioning

confidence: 99%

Arsenides of the Transition Metals: Vii. The Palladium–arsenic System

Saini¹,

Calvert²,

Heyding³

et al. 1964

Can. J. Chem.

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In the Pd-As system the existence of seven intermediate phases, PdAsz, a-Pd2.4s, 0-Pc12.1s, PdjAs2, Pd~.ejAs, PdaAs, and P d d s has been established by X-ray diffraction and thermal analysis. Single crystals of P-PdzAs and PdAsz have been grown by slow cooling from a temperature above the liquidus and of PdaAs and PdjAs by halide vapor transport. Pd-Ass is cubic, C2 (pyrite) structure, space group Pa3(Tg), a = 5.983f 0.001 A. a-PdzAs (stable below 455" C) is monoclinic, a = 9.24h0.01 A, b = 8.47h0.01 A, c = 10.45~k0.01 a, /3 = 94". p-PdzAs (stable above 455" C) has the revised C22 (Fe2P) structure, space group ~6 2~ (Djh), a = 6.6501 0.003 A, c = 3.58310.003 A, c/a = 0.5388. PdbAsz displays a form of polytypism and shows trigonal as well as hexagonal symmetry with different c parameters.decomposes peritectically a_nd its structure is unknown. PdaAs has tetragonal DO, (Fe3P) structure, space group 14(S2); redetermined lattice constants are a = 9.974Zt0.002 A, c = 4.822Zt 0.002 A, / a = 0.4834. PdjAs is C-face centered monoclinic, a = 5..jl4f 0.01 A, b = 7.725f 0.01 A, c = 8.4274~ 0.01 A, and P = 99"h.j'.The literature on the Pd-As system is very scanty. To our knowledge there are no reports on the formation and structure of palladium arsenides except an early study of PdAsz by Thomassen (I), short reports on PdsAs by Schubert (2), Heyding and Calvert (3), and a recent note on PdzA%s (high temperature phase) by Schubert (4). In order to establish the existence and composition of the intermediate phases and to characterize them, an investigation of this system by X-ray diffraction and thermal analysis has been undertaken in this laboratory. EXPERIMENTALThe palladium sponge was supplied by Engelhard Industries and had a purity of 99.9970 as determined spectrographically. I t was used without further purification. Arsenic (99.999% purity) was obtained from Cominco. I t was fractionally sublimed in vacuo a t 450' C to remove oxide contami~lant not recorded in the spectrographic analysis. Calculated quantities (5 to 10 g total) of palladium and arsenic were sealed in quartz ampoules a t 1 0 -h m Hg and heated a t 700' C for 24 hours. The reaction between palladium and arsenic being highly exothermic, all specimens were found to have melted after the initial reaction. The products were removed, crushed, and resealed in quartz ampoules for a series of annealing periods ranging from 2 months a t 300' C to 7 days a t 850' C. After each annealing period the specimens were quenched in water and Debye-Scherrer patterns obtained in 11.46 cm Norelco cameras using Ni-filtered Cu radiation. Powder photographs were also obtained on a Guinier-deWolff focussing camera with As203 as an internal standard. The intensities of the powder diffraction lines were obtained by comparison with a logarithmic interval density scale. Single crystal photographs were taken on a precession camera using zirconirlmfiltered rnolybdenum radiation. Densities were determined pycnometrically using water except in the cases of 0-PdzAs and PdbAs whe...

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Compounds of thorium with transition metals. II. Systems with iron, cobalt and nickel

Cited by 194 publications

References 0 publications

Magnetic Anisotropy of Lu₂Co_17-xSi_xSingle Crystals

Magnetic Anisotropy of Lu₂Co_17-xSi_xSingle Crystals

The structures of α-CaCu, β-CaCu, SrAg and BaAg: four different stacking variants based on noble-metal-centred trigonal prisms

Arsenides of the Transition Metals: Vii. The Palladium–arsenic System

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Compounds of thorium with transition metals. II. Systems with iron, cobalt and nickel

Cited by 194 publications

References 0 publications

Magnetic Anisotropy of Lu2Co17-xSixSingle Crystals

Magnetic Anisotropy of Lu2Co17-xSixSingle Crystals

The structures of α-CaCu, β-CaCu, SrAg and BaAg: four different stacking variants based on noble-metal-centred trigonal prisms

Arsenides of the Transition Metals: Vii. The Palladium–arsenic System

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Magnetic Anisotropy of Lu₂Co_17-xSi_xSingle Crystals

Magnetic Anisotropy of Lu₂Co_17-xSi_xSingle Crystals