In-situ reaction synthesis of pure bulk gadolinium dihydride materials

Zeng, Hong; Zhang, Jiuxing; Kuang, Chunjiang

doi:10.1016/j.intermet.2009.08.007

Cited by 7 publications

(3 citation statements)

References 24 publications

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“…The XRD data of Gd consist of Bragg reflection peaks, which correspond to the hexagonal closed pack ( hcp ) structure, classified by the space group P 63/ mmc , No. 194, and match well with the earlier report …”

Section: Resultssupporting

confidence: 92%

“…The observation of a step-down change in the DSC heating curve due to the magnetic phase transitions is similar to the structural phase transition driven by thermodynamic phase changes. − Likewise, a step-up change can be observed in the DSC cooling curve (Figure ). In the cooling cycle, the phase transition temperatures of Gd, Gd 5 Si 4 , and Gd 5 Si 2.4 Ge 1.6 are shifted to ∼283, ∼ 322, and ∼298 K, respectively.…”

Section: Resultsmentioning

confidence: 60%

“…194, and match well with the earlier report. 46 Figure 1b shows the heat flow measurement as a function of temperature obtained from DSC measurement for Gd, Gd 5 Si 4 , Gd 5 Si 2.4 Ge 1.6 , and (Gd 5 Si 2.4 Ge 1.6 ) 0.9 (SeS 2 ) 0.1 compounds. Si addition shifts T C of Gd-based TMMs toward higher temperatures, and Ge is found to move the transition toward lower temperatures.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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High-Performance Thermomagnetic Gd–Si–Ge Alloys

Singh

Liu

Zhang

et al. 2023

ACS Appl. Mater. Interfaces

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Exploring low-grade waste heat energy harvesting is crucial to address increasing environmental concerns. Thermomagnetic materials are magnetic phase change materials that enable energy harvesting from low-temperature gradients. To achieve a high thermomagnetic conversion efficiency, there are three main material requirements: (i) magnetic phase transition near room temperature, (ii) substantial change in magnetization with temperature, and (iii) high thermal conductivity. Here, we demonstrate a high-performance Gd 5 Si 2.4 Ge 1.6 thermomagnetic alloy that meets these three requirements. The magnetic phase transition temperature was successfully shifted to 306 K by introducing Ge doping in Gd 5 Si 4 , and a sharper and more symmetric magnetization behavior with saturation magnetization of M max = 70 emu/g at a 2 T magnetic field was achieved in the ferromagnetic state. The addition of SeS 2 , as a low-temperature sintering aid, to the Gd−Si−Ge alloy improved the material's density and thermal conductivity by ∼45 and ∼275%, respectively. Our results confirm that the (Gd 5 Si 2.4 Ge 1.6 ) 0.9 (SeS 2 ) 0.1 alloy is a suitable composite material for low-grade waste heat recovery in thermomagnetic applications.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 60%

Section: ■ Results and Discussionmentioning

confidence: 99%

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High-Performance Thermomagnetic Gd–Si–Ge Alloys

Singh

Liu

Zhang

et al. 2023

ACS Appl. Mater. Interfaces

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BiCuSeO/GdH2 thermoelectric composite: a p-type to n-type promoter with superior charge transport

Bhoomika

Gurukrishna²,

Madhukar³

et al. 2023

J Mater Sci: Mater Electron

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We herein report on compositing highly conductive GdH2 with BiCuSeO, with an aim to modulate the electronic transport and the nature of conductivity in the high-temperature regime. The incorporation of GdH2 as a minor matrix in BiCuSeO, as confirmed by structural studies, has considerably enhanced electrical conductivity in the system, thereby demonstrating the existence of thermal activation of the charge carriers. The effect of minor matrix is directly on the conversion of p-type to n-type conductivity in BiCuSeO system at near room temperature. Electronic quality factor (BE) has identified the ambiguities in the transport behaviour at near room temperature due to the addition of minor matrix. Enhancement in the power factor is seen due to GdH2, with a highest attained value of 221 μW m K−2 at 700 K for the sample with x = 11 wt%, which is nearly twice the value of pristine BiCuSeO. Highest ZT of 0.011 is obtained for the pristine BiCuSeO sample at 380 K.

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