Anisotropic and Polycrystalline Materials

Grimvall, Göran

doi:10.1016/b978-044482794-4/50019-x

Cited by 56 publications

(103 citation statements)

References 0 publications

Supporting

Mentioning

100

Contrasting

Order By: Relevance

“…As the temperature rises, the heat capacity (Figure 9a) increases, which obeys Debye's heat capacity law. [ 25 ] Moreover, the heat capacity decreases gradually with the composition from LSFA20 to LSFA80, which is ascribed to higher average atomic mass of LSF than that of Al 2 O 3 compounds. However, the thermal diffusivity is poles apart from that of heat capacity.…”

Section: Resultsmentioning

confidence: 99%

Dual Properties of Microwave Absorption and Thermal Protection in La_0.5Sr_0.5FeO₃–Al₂O₃ Pseudobinary Composites

Gao

et al. 2023

Adv Eng Mater

View full text Add to dashboard Cite

As multifunctional material for microwave absorption and thermal protection, the dielectric and thermophysical properties of equilibrium phases in LSF(La0.5Sr0.5FeO3)–Al2O3 pseudobinary phase diagram are investigated herein. Four pseudobinary composites are obtained by sintering at 1400 °C for 10 h with different raw components (x wt% LSF‐(100−x) wt% Al2O3, x = 20, 40, 60 and 80), labeled as LSFA20, LSFA40, LSFA60, and LSFA80, respectively. After sintering, the main equilibrium phase in LSFA20 and LSFA40 composites is SrAl12O19‐based solid solution. For LSFA60 and LSFA80, however, LSF‐based and SrAl12O19‐based solid solutions are the main equilibrium phases. The increase of conductive LSF content results in the highest dielectric loss tangent and the best microwave absorbing property in LSFA80, in which the bandwidths for reflection loss less than −10 and −5 dB are about 2.37 and 7.7 GHz, respectively, when the thickness is only 1.5 mm. The thermophysical properties reveal that the thermal conductivity in LSF‐Al2O3 pseudobinary composites shows weak temperature dependence because of the opposite contribution between phonons and electrons. It is lower than that of the traditional thermal barrier coating material of 8 wt% Y2O3‐stabilized zirconia (8YSZ).

show abstract

Section: Resultsmentioning

confidence: 99%

Dual Properties of Microwave Absorption and Thermal Protection in La_0.5Sr_0.5FeO₃–Al₂O₃ Pseudobinary Composites

Gao

et al. 2023

Adv Eng Mater

View full text Add to dashboard Cite

show abstract

“…We have measured the temperature dependence of thermal conductivity of bulk CoFeCrGa using the thermal transport option of the PPMS, as shown in the Supporting Information (Figure S4). Using the reported values of the thermal conductivities of the Apiezon N-grease, 52 and the MgO crystal, 53 we have determined the temperature dependence of ΔT eff for different t CoFeCrGa using eq 5, as shown in Figure 8a−c. Here, we have ignored the interfacial thermal resistances between the N-grease and the hot/cold plates as well as between the sample and N-grease layers.…”

Section: Mechanism Of Lsse and Ane At Low Temperaturesmentioning

confidence: 99%

Large Thermo-Spin Effects in Heusler Alloy-Based Spin Gapless Semiconductor Thin Films

Chanda,

Rani,

DeTellem

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Recently, Heusler alloy-based spin gapless semiconductors (SGSs) with high Curie temperature (T C ) and sizable spin polarization have emerged as potential candidates for tunable spintronic applications. We report comprehensive investigation of the temperature-dependent ANE and intrinsic longitudinal spin Seebeck effect (LSSE) in CoFeCrGa thin films grown on MgO substrates. Our findings show that the anomalous Nernst coefficient for the MgO/CoFeCrGa (95 nm) film is ≈1.86 μV K −1 at room temperature, which is nearly 2 orders of magnitude higher than that of the bulk polycrystalline sample of CoFeCrGa (≈0.018 μV K −1 ) and almost 3 orders of magnitude higher than that of the half-metallic ferromagnet La 1−x Na x MnO 3 (≈0.005 μV K −1 ) but comparable to that of the magnetic Weyl semimetal Co 2 MnGa thin film (≈2−3 μV K −1 ). Furthermore, the LSSE coefficient for our MgO/CoFeCrGa (95 nm)/Pt (5 nm) heterostructure is ≈20.5 nV K −1 Ω −1 at room temperature, which is twice larger than that of the half-metallic ferromagnetic La 0.7 Sr 0.3 MnO 3 thin films (≈9 nV K −1 Ω −1 ). We show that both ANE and LSSE coefficients follow identical temperature dependences and exhibit a maximum at ≈225 K, which is understood as the combined effects of inelastic magnon scatterings and reduced magnon population at low temperatures. Our analyses not only indicate that the extrinsic skew scattering is the dominating mechanism for ANE in these films but also provide critical insights into the functional form of the observed temperature-dependent LSSE at low temperatures. Furthermore, by employing radio frequency transverse susceptibility and broad-band ferromagnetic resonance in combination with the LSSE measurements, we establish a correlation among the observed LSSE signal, magnetic anisotropy, and Gilbert damping of the CoFeCrGa thin films, which will be beneficial for fabricating tunable and highly efficient Heusler alloy-based spin caloritronic nanodevices.

show abstract

“…Then, the homogeneous finite strain method is used to calculate the complete set of second-order elastic constants (SOECs). 39 The elastic constant characterizes the material elasticity, which is the Gibbs free energy as an extension of the Taylor series with respect to the Lagrange strain. By fitting the energy−strain curve, the second-order Taylor expansion coefficient of SOECs is obtained, which is used to calculate the elastic properties of cage hydrates.…”

Section: Full Elasticity Tensor Determinationmentioning

confidence: 99%

“…First, the bulk modulus (B) and shear modulus (G) of the crystal are calculated by the Voigt−Reuss−Hill average scheme. 39 Then, Young's modulus (E) and Poisson's ratio (v) can be derived from B and G. The SOECs are calculated from the energy variation by utilizing strains to the cubic lattice configuration. The Taylor series of elastic strain is used to represent the total energy change of the system under a zero pressure system, 40−42 In calculation, the elastic energy under strain is given by…”

Section: Full Elasticity Tensor Determinationmentioning

confidence: 99%

Ab Initio Studies of Structural and Mechanical Properties of NH₃, NO, and N₂O Hydrates

Sun

Qiu

et al. 2023

ACS Omega

View full text Add to dashboard Cite

The investigation on the mechanical properties of clathrate hydrate is closely related to the exploitation of hydrates and gas transportation. In this article, the structural and mechanical properties of some nitride gas hydrates were studied using DFT calculations. First, the equilibrium lattice structure is obtained by geometric structure optimization; then, the complete second-order elastic constant is determined by energy-strain analysis, and the polycrystalline elasticity is predicted. It is found that the NH 3 , N 2 O, and NO hydrates all have high elastic isotropy but are different in shear characteristics. This work may lay a theoretical foundation for studying the structural evolution of clathrate hydrates under the mechanical field.

show abstract

Anisotropic and Polycrystalline Materials

Cited by 56 publications

References 0 publications

Dual Properties of Microwave Absorption and Thermal Protection in La_0.5Sr_0.5FeO₃–Al₂O₃ Pseudobinary Composites

Dual Properties of Microwave Absorption and Thermal Protection in La_0.5Sr_0.5FeO₃–Al₂O₃ Pseudobinary Composites

Large Thermo-Spin Effects in Heusler Alloy-Based Spin Gapless Semiconductor Thin Films

Ab Initio Studies of Structural and Mechanical Properties of NH₃, NO, and N₂O Hydrates

Contact Info

Product

Resources

About

Anisotropic and Polycrystalline Materials

Cited by 56 publications

References 0 publications

Dual Properties of Microwave Absorption and Thermal Protection in La0.5Sr0.5FeO3–Al2O3 Pseudobinary Composites

Dual Properties of Microwave Absorption and Thermal Protection in La0.5Sr0.5FeO3–Al2O3 Pseudobinary Composites

Large Thermo-Spin Effects in Heusler Alloy-Based Spin Gapless Semiconductor Thin Films

Ab Initio Studies of Structural and Mechanical Properties of NH3, NO, and N2O Hydrates

Contact Info

Product

Resources

About

Dual Properties of Microwave Absorption and Thermal Protection in La_0.5Sr_0.5FeO₃–Al₂O₃ Pseudobinary Composites

Dual Properties of Microwave Absorption and Thermal Protection in La_0.5Sr_0.5FeO₃–Al₂O₃ Pseudobinary Composites

Ab Initio Studies of Structural and Mechanical Properties of NH₃, NO, and N₂O Hydrates