Heat capacity of nanocrystalline Yb2O3

Rojas, D.P.; Espeso, J.I.; Fernández, Lidia Rodríguez; Barquı́n, L. Fernández

doi:10.1016/j.ceramint.2021.09.170

Cited by 5 publications

(3 citation statements)

References 31 publications

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“…The situation is complicated by the fact that Yb2O3 (which might be present in the sample-although not detected by XRD) shows a peak of magnetic origin [47] in the vi cinity of the upturn present. Low-temperature specific heat (Figure 8) exhibits an upturn in C/T(T).…”

Section: Specific Heatmentioning

confidence: 98%

Heavy-Fermion Properties of Yb2Pd2SnH≈2

Maskova-Cerna,

Bauer,

Giovannini

et al. 2023

Inorganics

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A hydride of Yb2Pd2Sn could be synthesized with approximately 2 H atoms per f.u. The hydrogenation leads to a volume expansion while preserving the tetragonal symmetry (P4/mbm). The lattice reaction is strongly anisotropic, and the 5% expansion in c is partly compensated by the 0.5% compression in a. The hydride is paramagnetic at least down to 0.5 K. Yb remains at or very close to the 3+ (4f13) state, as in Yb2Pd2Sn. Specific heat C/T vs. T shows an upturn existing already in Yb2Pd2Sn, but it is much more pronounced in the hydride (1.8 J/mol f.u. K2 for T → 0, i.e., more than twice higher than in its precursor). This is interpreted as lowering the Kondo temperature due to H bonding.

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Section: Specific Heatmentioning

confidence: 98%

Heavy-Fermion Properties of Yb2Pd2SnH≈2

Maskova-Cerna,

Bauer,

Giovannini

et al. 2023

Inorganics

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“…The lattice parameters and atomic positions of YbPdAs obtained from Rietveld refinements on the powder neutron diffraction data at 4 and 300K, together with the profile factor Rp and the weighted profile factor Rwp. phase [33]. The refined crystal structure parameters are listed in Table . II.…”

Section: Compounds Lin ( å) Lout( å) ∆L( å) ∆L/lin(%) Propertiesmentioning

confidence: 99%

Semimetallic Kondo lattice behavior in YbPdAs with a distorted kagome structure

Xie

Zheng

et al. 2022

Phys. Rev. B

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We have synthesized YbPdAs with the hexagonal ZrNiAl-type structure, in which the Yb-atoms form a distorted kagome sublattice in the hexagonal basal plane. Magnetic, transport, and thermodynamic measurements indicate that YbPdAs is a low-carrier Kondo lattice compound with an antiferromagnetic transition at TN = 6.6 K, which is slightly suppressed in applied magnetic fields up to 9 T. The magnetic entropy at TN recovers only 33% of R ln 2, the full entropy of the ground state doublet of the Yb-ions. The resistivity displays a − ln T dependence between 30 and 15 K, followed by a broad maximum at T coh = 12 K upon cooling. Below T coh , the magnetoresistance changes from negative to positive, suggesting a crossover from single-ion Kondo scattering processes at intermediate temperatures to coherent Kondo lattice behaviors at low temperatures. Both the Hall resistivity measurements and band structure calculations indicate a relatively low carrier concentration in YbPdAs. Our results suggest that YbPdAs could provide an opportunity for examining the interplay of Kondo physics and magnetic frustration in low carrier systems.

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“…This change in the deformation mechanism provides superior mechanical properties to NC materials [19]. Due to these nano-scale features, the NC materials have enhanced strength [20][21][22], improved fatigue life [23][24][25], superior wear resistance [26,27], improved hardness [20,28,29], higher specific heat [30,31], and improved coefficient of thermal expansion [32][33][34]. However, researchers also revealed that NC materials have lower ductility [35].…”

Section: Processing Of Nc Materialsmentioning

confidence: 99%

Nanocrystalline Materials: Synthesis, Characterization, Properties, and Applications

et al. 2021

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Nanostructuring is a commonly employed method of obtaining superior mechanical properties in metals and alloys. Compared to conventional polycrystalline counterparts, nanostructuring can provide remarkable improvements in yield strength, toughness, fatigue life, corrosion resistance, and hardness, which is attributed to the nano grain size. In this review paper, the current state-of-the-art of synthesis methods of nanocrystalline (NC) materials such as rapid solidification, chemical precipitation, chemical vapor deposition, and mechanical alloying, including high-energy ball milling (HEBM) and cryomilling was elucidated. More specifically, the effect of various process parameters on mechanical properties and microstructural features were explained for a broad range of engineering materials. This study also explains the mechanism of grain strengthening using the Hall-Petch relation and illustrates the effects of post-processing on the grain size and subsequently their properties. This review also reports the applications, challenges, and future scope for the NC materials.

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Heat capacity of nanocrystalline Yb2O3

Cited by 5 publications

References 31 publications

Heavy-Fermion Properties of Yb2Pd2SnH≈2

Heavy-Fermion Properties of Yb2Pd2SnH≈2

Semimetallic Kondo lattice behavior in YbPdAs with a distorted kagome structure

Nanocrystalline Materials: Synthesis, Characterization, Properties, and Applications

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