14 research outputs found
Origin of the metamagnetic transitions in Y1-xErxFe2(H,D)4.2 compounds
The structural and magnetic properties of Y1-xErxFe2 intermetallic compounds
and their hydrides and deuterides Y1-xErxFe2H(D)4.2 have been investigated
using X-ray diffraction and magnetic measurements under static and pulsed
magnetic field up to 60 T. The intermetallics crystallize in the C15 cubic
structure , whereas corresponding hydrides and deuterides crystallize in a
monoclinic structure. All compounds display a linear decrease of the unit cell
volume versus Er concentration; the hydrides have a 0.8% larger cell volume
compared to the deuterides with same Er content. They are ferrimagnetic at low
field and temperature with a compensation point at x = 0.33 for the
intermetallics and x = 0.57 for the hydrides and deuterides. A sharp first
order ferromagnetic-antiferromagnetic (FM-AFM) transition is observed upon
heating at TFM-AFM for both hydrides and deuterides. These compounds show two
different types of field induced transitions, which have different physical
origin. At low temperature (T < 50 K), a forced ferri-ferromagnetic
metamagnetic transition with Btrans1 = 8 T, related to the change of the Er
moments orientation from antiparallel to parallel Fe moment, is observed.
Btrans1 is not sensitive to Er concentration, temperature and isotope effect. A
second metamagnetic transition resulting from antiferromagnetic to
ferrimagnetic state is also observed. The transition field Btrans2 increases
linearly versus temperature and relates to the itinerant electron metamagnetic
behavior of the Fe sublattice. An onset temperature TM0 is obtained by
extrapolating TFM-AFM (B) at zero field. TM0 decreases linearly versus the Er
content and is 45(5) K higher for the hydrides compared to the corresponding
deuteride. The evolution of TM0 versus cell volume shows that it cannot be
attributed exclusively to a pure volume effect and that electronic effects
should also be considered.Comment: 22 pages, 10 figure
Magnetic transitions with magnetocaloric effects near room temperature related to structural transitions in Y0.9Pr0.1Fe2D3.5 deuteride
International audienceThe structural and magnetic properties of Y0.9Pr0.1Fe2D3.5 deuteride have been investigated by synchrotron and neutron diffraction, magnetic measurements, and differential scanning calorimetry. Deuterium insertion induces a 23.5 % cell volume increase and a lowering of crystal symmetry compared to the cubic C15 Y0.9Pr0.1Fe2 parent compound (Fd-3m SG). The deuteride is monoclinic (P21/c SG) below 330 K and undergoes a first order transition between 330 and 350 K towards a pseudo-cubic structure (R-3m SG) with TO-D = 342(2) K. I In both structures the D atoms are located in 96 % R2Fe2 and 4 % RFe3 tetrahedral interstitial sites (R=Y0.9Pr0.1). The compound is ferromagnetic, accompanied by a magnetostrictive effect below TC = 274 K. The analysis of the critical exponents indicates a second order type transition with a deviation from the isotropic 3D Heisenberg model towards the 3D XY model. This implies an easy plane of magnetization in agreement with cell parameter variation showing a planar magnetic orientation. A weak magnetic peak is even observed at the order-disorder transition with a maximum at 343 K. Magnetic entropy variations are characteristic of direct and inverse magnetocaloric effects at TC and TO-D respectively
Four ternary silicides in the La-Ni-Si system: from polyanionic layers to frameworks
The central part of the La-Ni-Si system has been investigated at 800 °C by means of single crystal X-ray diffraction, microscopy and analytical microprobe techniques. The result led to the identification of four new metal-rich silicides: LaNi2Si (R3Ìm, a = 4.0263(3) Ă
, c = 15.066(2) Ă
, Z = 3), La2Ni3Si2 (P21/c, a = 6.8789(7) Ă
, b = 6.2167(3) Ă
, c = 12.214(1) Ă
, ÎČ = 90.92(1), Z = 4), La3Ni3Si2 (Pnma, a = 7.501(2) Ă
, b = 14.316(4) Ă
, c = 6.149(2) Ă
, Z = 4), La6Ni7Si4 (Pbcm, a = 6.066(1) Ă
, b = 7.488(1) Ă
, c = 29.682(5) Ă
, Z = 4). LaNi2Si belongs to the SrCu2Ga structure type, which is not represented among silicides, while La2Ni3Si2 crystallizes in its own structure type. Both compounds feature layered polyanionic motifs consisting of Ni and Si, which are separated by La. Instead, La6Ni7Si4 and La3Ni3Si2 are characterized by polyanionic networks. The former compound belongs to the Pr6Ni7Si4 structure type, with only two other representatives (Ce and Nd); the latter has been observed only with Rh and Ir. The two structures reveal close structural relationships having multiple identical slabs. Tight-binding electronic structure calculations by linear muffin-tin-orbital methods were performed for LaNi2Si, La2Ni3Si2 and La3Ni3Si2 to gain insights into their structure-bonding relationships. Their band structures suggest a metallic character for all compounds. The overall crystal orbital Hamilton populations are dominated by polar Ni-Si bonds, though homoatomic Ni-Ni and La-Ni(Si) bond contributions are not negligible. The variety of bonding patterns may serve as a logical explanation for the number of discovered compounds in this system as well as for the diversity of the observed structures