The purification and crystal growth of rare earth metals using solid state electrotransport

Fort, D.

doi:10.1016/0022-5088(87)90442-5

Cited by 39 publications

(4 citation statements)

References 20 publications

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“…Appropriate starting compositions of high purity elements (Ce 99.9 % further purified by solid state electrotransport [17], Pd 99.995 %, Pt 99.995 %, In 99.999 %) with total weight of 5 g were placed in alumina crucibles. Another crucible, filled with quartz wool was placed on top of it.…”

Section: Methodsmentioning

confidence: 99%

Single crystal study of the layered heavy fermion compounds Ce2PdIn8, Ce3PdIn11, Ce2PtIn8 and Ce3PtIn11

Kratochvílová

Dušek

Uhlířová

et al. 2014

Journal of Crystal Growth

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We report on single crystal growth and crystallographic parameters results of Ce 2 PdIn 8 , Ce 3 PdIn 11, Ce 2 PtIn 8 and Ce 3 PtIn 11 . The Pt-systems Ce 2 PtIn 8 and Ce 3 PtIn 11 are synthesized for the first time. All these compounds are member of the Ce n T m In 3n+2m (n = 1, 2,..; m = 1, 2,.. and T = transition metal) to which the extensively studied heavy fermion superconductor CeCoIn 5 belongs. Single crystals have been grown by In self-flux method. Differential scanning calorimetry studies were used to derive optimal growth conditions. Evidently, the maximum growth conditions for these materials should not exceed 750 °C. Single crystal x-ray data show that Ce 2 TIn 8 compounds crystallize in the tetragonal Ho 2 CoGa 8 phase (space group P4/mmm) with lattice parameters a =4.6898(3) Å and c =12.1490(8) Å for the Pt-based one (Pd: a = 4.6881(4) Å and c = 12.2031(8) Å). The Ce 3 TIn 11 compounds adopt the Ce 3 PdIn 11 structure with a = 4.6874(4) Å and c = 16.8422(12) Å for the Pt-based one (Pd: a = 4.6896 Å and c = 16.891 Å). Specific heat experiments on Ce 3 PtIn 11 and Ce 3 PdIn 11 have revealed that both compounds undergo two successive magnetic transitions at T 1 ~ 2.2 K followed by T N ~ 2.0 K and T 1 ~ 1.7 K and T N ~ 1.5 K, respectively. Additionally, both compounds exhibit enhanced Sommerfeld coefficients yielding γ Pt = 0.300 J/mol K 2 Ce (γ Pd = 0.290 J/mol K 2 Ce), hence qualifying them as heavy fermion materials.

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Section: Methodsmentioning

confidence: 99%

Single crystal study of the layered heavy fermion compounds Ce2PdIn8, Ce3PdIn11, Ce2PtIn8 and Ce3PtIn11

Kratochvílová

Dušek

Uhlířová

et al. 2014

Journal of Crystal Growth

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“…A pyrolitic graphite filter was used to prevent contamination by neutrons with half this wavelength. A single crystal of neodymium, grown by the solid-state strain anneal method at elevated temperatures in UHV [17], was placed inside a high-pressure clamp cell [18] surrounded by a fluorocarbon, Fluorinert (C 8 F 18 ). Liquid at room temperature and ambient pressure, the Fluorinert solidifies at the low temperatures of our experiment; this may introduce a uniaxial component of stress along the cylindrical axis of the clamp cell.…”

Section: Methodsmentioning

confidence: 99%

Magnetism in neodymium at high pressure

Watson

Forgan

Nuttall

et al. 1996

J. Phys.: Condens. Matter

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We have carried out magnetic neutron diffraction studies of a single crystal of neodymium at high pressure, using clamp cells on the diffractometer D10 at the Institut Laue-Langevin, Grenoble. The magnetic ordering was investigated at pressures up to 14 kbar in the temperature range 1.4-25 K. A number of quite different magnetic phases were observed, including the coexistence of ferromagnetic and antiferromagnetic ordering of moments on the inequivalent crystallographic sites. The structures formed and the population of the different symmetrically equivalent domains appear to be affected by complex interactions between the cubic-site ferromagnetism, the antiferromagnetic hexagonal-site ordering and a uniaxial component of stress.

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“…CeRh(Si 1−x Ge x ) 3 single crystals with nominal concentrations of x = 0.05 and x = 0.15 were synthesized by floating zone (FZ) method. In an initial step of preparing the feed rods stoichiometric amounts of constituent elements Ce (3N, further purified by solid state electrotransport [35]), Rh (3N7), Si (6N) and Ge (5N) were arc-melted in a mono-arc under Ar (6N) protective atmosphere. Each alloy button was re-melted three times in order to ensure homogeneity.…”

Section: Methodsmentioning

confidence: 99%

Impact of isoelectronic substitution and hydrostatic pressure on the quantum critical properties of CeRhSi₃

Valenta

Naka

Diviš

et al. 2020

J. Phys.: Condens. Matter

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There is an ongoing dispute in the community about the absence of a magnetic quantum critical point (QCP) in the noncentrosymmetric heavy fermion compound CeRhSi 3 . In order to explore this question we prepared single crystals of CeRh(Si 1−x Ge x ) 3 with x = 0.05 and 0.15 and determined the temperature-pressure (T-p) phase diagram by means of measurements of the electrical resistivity. The substitution of isoelectronic but large Ge enforces a lattice volume increase resulting in a weakening of the Kondo interaction. As a result, the x = 0.05 and x = 0.15 compound exhibit a transition into the antiferromagnetic (AFM) at higher temperatures being T N = 4.7 K and T N1 = 19.7 K, respectively. Application of pressure suppresses T N (T N1 ) monotonically and pressure induced superconductivity is observed in both Ge-substituted compounds above p 2.16 GPa (x = 0.05) and p 2.93 GPa (x = 0.15). Extrapolation of T N (p) → 0 of CeRh(Si 0.95 Ge 0.05 ) 3 yields a critical pressure of p c ≈ 3.4 GPa (in CeRh(Si 0.85 Ge 0.15 ) 3 p c ≈ 3.5 GPa) pointing to the presence of an AFM QCP located deep inside the superconducting state.

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The purification and crystal growth of rare earth metals using solid state electrotransport

Cited by 39 publications

References 20 publications

Single crystal study of the layered heavy fermion compounds Ce2PdIn8, Ce3PdIn11, Ce2PtIn8 and Ce3PtIn11

Single crystal study of the layered heavy fermion compounds Ce2PdIn8, Ce3PdIn11, Ce2PtIn8 and Ce3PtIn11

Magnetism in neodymium at high pressure

Impact of isoelectronic substitution and hydrostatic pressure on the quantum critical properties of CeRhSi₃

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The purification and crystal growth of rare earth metals using solid state electrotransport

Cited by 39 publications

References 20 publications

Single crystal study of the layered heavy fermion compounds Ce2PdIn8, Ce3PdIn11, Ce2PtIn8 and Ce3PtIn11

Single crystal study of the layered heavy fermion compounds Ce2PdIn8, Ce3PdIn11, Ce2PtIn8 and Ce3PtIn11

Magnetism in neodymium at high pressure

Impact of isoelectronic substitution and hydrostatic pressure on the quantum critical properties of CeRhSi3

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Impact of isoelectronic substitution and hydrostatic pressure on the quantum critical properties of CeRhSi₃