The TDPAC study of the hyperfine interactions at 111Cd nuclei in RAl3 compounds synthesized under high pressure

Tsvyashchenko, A. V.; Фомичева, Л.Н.; Brudanin, V.; Kochetov, O.; Salamatin, A. V.; Velichkov, A.; Wierteł, M.; Budzyński, M.; Сорокин, А.А.; Ryasny, G.K.; Komissarova, B.A.

doi:10.1016/j.ssc.2007.02.027

Cited by 3 publications

(5 citation statements)

References 8 publications

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“…͑1͒ to the experimental data are listed in Table III. The RT parameters of GdAl 3 are in agreement with the previous result of Zacate and Collins, 9 the parameters of RAl 3 , R = Tm, Yb, Lu agree within 2% with the values recently reported by Tsvyashchenko et al 17 for RAl 3 compounds synthesized under high pressure.…”

supporting

confidence: 92%

“…The SnNi 3 structure is found for R = Ce, Pr, Gd and the BaPb 3 structure for R = Tb, Y. ͑Note: Recently, Tsvyashchenko et al 17 have shown that different structures may result when the compounds are synthesized under high pressure͒. X-ray diffraction measurements established that the RAl 3 compounds of main interest in the context of our study ͑R = Tm, Yb, and Lu͒ were almost single phase with contributions of RAl 2 not exceeding 15%.…”

Section: A Sample Preparation and Equipmentmentioning

confidence: 89%

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Electric field gradients in the rare earth–aluminium compoundsRAl2andRAl3studied by
Forker
¹
,
Presa
²

2007
Phys. Rev. B

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Perturbed angular correlation ͑PAC͒ spectroscopy has been used to investigate the electric field gradient ͑EFG͒ at the probe nucleus 111 In/ 111Cd in the paramagnetic phase of the rare earth ͑R͒-aluminium compounds RAl 2 for all R elements and Y and in RAl 3 for R = Gd, Tm, Yb, Lu. The nuclear electric quadrupole interaction ͑QI͒ between the EFG and the 111 Cd quadrupole moment was measured as a function of temperature in the range T C Ͻ T ഛ 1200 K. In the second half of the RAl 2 series and in the RAl 3 compounds, except for YbAl 3 , the quadrupole frequency q shows the monotonous decrease with increasing temperature normally observed with closed-shell probe nuclei in metallic systems. In the early members of the RAl 2 series, however, q ͑T͒ passes through a maximum at T ϳ 300 K. It is proposed that this unusual behavior reflects a contribution of the 4f shell of the R constituents to the EFG at the Al site which is quenched at higher temperatures by thermal averaging of the 4f quadrupole moment. In the intermediate-valence compound YbAl 3 the temperature dependence of the QI exhibits a shallow maximum which can be related to the temperature variation of the 4f hole occupation. Furthermore the PAC spectra provide information on the site preference of the Cd. The temperature dependence of the relaxation rates shows an Arrhenius behavior with jump activation enthalpies E A = 1.6͑1͒ eV for R = Tm, Lu and E A = 1.2͑1͒ eV for R =Yb.

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supporting

confidence: 92%

Section: A Sample Preparation and Equipmentmentioning

confidence: 89%

Electric field gradients in the rare earth–aluminium compoundsRAl2andRAl3studied by
Forker
¹
,
Presa
²

2007
Phys. Rev. B

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“…SDS has become a robust and efficient global search and optimization technique that was theoretically defined extensively, especially when combined with other swarm intelligence (SI) algorithms, such as artificial bee colony (ABC) to robust searching techniques jumping over the local optimal solution to global one [62,63]. There is no one optimization technique that is best suited for a wide range of applications or handling 19) and (20).…”

Section: Stage (2): Predicting the Integration Efficiencymentioning

confidence: 99%

“…For instance, the cost per W is exclusively determined by energy per unit area and running duration when the fuel cost is minimal or virtually free, such as in waste heat recovery (energy recycling). The scientists thus focused on materials with better power output as opposed to conversion efficiency, such as a rare earth compound, YbAl 3 (Density: ρ = 5.68 Mg•m −3 ), and other alloys that have a low value but yield energy of at least two times as much as any other material and can function across the temperature range of trash [20]. Therefore, a famous generator company expressed the desire to test the efficiency of the candidate three alloys, which are (LiFePO 4 -Al) ≈ (Fe − Al), (Cu-LiFePO 4 ) ≈ (Cu − Fe) and (LiAlH 4 -Cu) ≈ (Al − Cu) to form the thermal conductors' strips and texture of ICE gaskets (Hot TEG plates).…”

Section: Introductionmentioning

confidence: 99%

Building a Digital Twin Simulator Checking the Effectiveness of TEG-ICE Integration in Reducing Fuel Consumption Using Spatiotemporal Thermal Filming Handled by Neural Network Technique

2022

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Scholars seek to recycle wasted energy to produce electricity by integrating thermoelectric generators (TEGs) with internal combustion engines (ICE), which rely on the electrical conductivity, β, of the thermal conductor strips. The TEG legs are alloyed from iron, aluminum and copper in a strip shape with specific characteristics that guarantee maximum thermo-electric transformation, which has fluctuated between a uniform, Gaussian, and exponential distribution according to the structure of the alloy. The ICE exhaust and intake gates were chosen as the TEG sides. The digital simulator twin model checks the integration efficiency through two sequential stages, beginning with recording the causes of thermal conductivity failure via filming and extracting their data by neural network procedures in the feed of the second stage, which reveal that the cracks are a major obstacle in reducing the TEG-generated power. Therefore, the interest of the second stage is predicting the cracks’ positions, Pi,j, and their intensity, QP, based on the ant colony algorithm which recruits imaging data (STTF-NN-ACO) to install the thermal conductors far away from the cracks’ positions. The proposed metaheuristic (STTF-NN-ACO) verification shows superiority in the prediction over [Mat-ACO] by 8.2% and boosts the TEGs’ efficiency by 32.21%. Moreover, increasing the total generated power by 12.15% and working hours of TEG by 20.39%, reflects reduced fuel consumption by up to 19.63%.

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“…Like Sc, Tm and Lu are cheaper than Sc and can also form thermodynamically stable L1 2 -structured trialuminide compound. [9,10] The microstructure and mechanical properties of Tm and Lu containing Al alloys have been investigated, and it has been found that Tm and Lu can improve the creep-resistance properties of Al alloys by forming L1 2 structure Al 3 Tm and Al 3 Lu precipitates or solid solved in the matrix. [11] The recent studies of L1 2 structures Al 3 Tm and Al 3 Lu mainly focused on the electronic structure and elastic constant under ground states.…”

Section: Introductionmentioning

confidence: 99%

Lattice stabilities, mechanical and thermodynamic properties of Al ₃ Tm and Al ₃ Lu intermetallics under high pressure from first-principles calculations

Zhang

Jiang

2016

Chinese Phys. B

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The effects of high pressure on lattice stability, mechanical and thermodynamic properties of L1 2 structure Al 3 Tm and Al 3 Lu are studied by first-principles calculations within the VASP code. The phonon dispersion curves and density of phonon states are calculated by using the PHONONPY code. Our results agree well with the available experimental and theoretical values. The vibrational properties indicate that Al 3 Tm and Al 3 Lu keep their dynamical stabilities in L1 2 structure up to 100 GPa. The elastic properties and Debye temperatures for Al 3 Tm and Al 3 Lu increase with the increase of pressure. The mechanical anisotropic properties are discussed by using anisotropic indices A G , A U , A Z , and the threedimensional (3D) curved surface of Young's modulus. The calculated results show that Al 3 Tm and Al 3 Lu are both isotropic at 0 GPa and anisotropic under high pressure. In the present work, the sound velocities in different directions for Al 3 Tm and Al 3 Lu are also predicted under high pressure. We also calculate the thermodynamic properties and provide the relationships between thermal parameters and temperature/pressure. These results can provide theoretical support for further experimental work and industrial applications.

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The TDPAC study of the hyperfine interactions at 111Cd nuclei in RAl3 compounds synthesized under high pressure

Cited by 3 publications

References 8 publications

Electric field gradients in the rare earth–aluminium compoundsRAl2andRAl3studied by
Forker
¹
,
Presa
²

2007
Phys. Rev. B

Electric field gradients in the rare earth–aluminium compoundsRAl2andRAl3studied by
Forker
¹
,
Presa
²

2007
Phys. Rev. B

Building a Digital Twin Simulator Checking the Effectiveness of TEG-ICE Integration in Reducing Fuel Consumption Using Spatiotemporal Thermal Filming Handled by Neural Network Technique

Lattice stabilities, mechanical and thermodynamic properties of Al ₃ Tm and Al ₃ Lu intermetallics under high pressure from first-principles calculations

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The TDPAC study of the hyperfine interactions at 111Cd nuclei in RAl3 compounds synthesized under high pressure

Cited by 3 publications

References 8 publications

Electric field gradients in the rare earth–aluminium compoundsRAl2andRAl3studied byForker1, Presa2 2007Phys. Rev. B

Electric field gradients in the rare earth–aluminium compoundsRAl2andRAl3studied byForker1, Presa2 2007Phys. Rev. B

Building a Digital Twin Simulator Checking the Effectiveness of TEG-ICE Integration in Reducing Fuel Consumption Using Spatiotemporal Thermal Filming Handled by Neural Network Technique

Lattice stabilities, mechanical and thermodynamic properties of Al 3 Tm and Al 3 Lu intermetallics under high pressure from first-principles calculations

Contact Info

Product

Resources

About

Electric field gradients in the rare earth–aluminium compoundsRAl2andRAl3studied by
Forker
¹
,
Presa
²

2007
Phys. Rev. B

Electric field gradients in the rare earth–aluminium compoundsRAl2andRAl3studied by
Forker
¹
,
Presa
²

2007
Phys. Rev. B

Lattice stabilities, mechanical and thermodynamic properties of Al ₃ Tm and Al ₃ Lu intermetallics under high pressure from first-principles calculations