Table-like magnetocaloric effect and enhanced refrigerant capacity of HPS La(Fe,Si)13-based composites by Ce–Co grain boundary diffusion

Zhong, Xichun; Dong, X.T.; Peng, Daoling; Huang, Jiajin; Zhang, H.; Jiao, Dongling; Liu, Z. W.; Ramanujan, R.V.

doi:10.1007/s10853-020-04449-1

Cited by 28 publications

(7 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, the mass fraction of 1:7 phase in the LaFe 11.6 Si 1.4 /10 wt.%Ce 2 Co 7 composites decreased with an increase in sintering time. As reported earlier [41], the 1:7 phase occurred at grain boundaries after annealing for a short time. Clearly, the 1:7 phase content after short time annealing increased for larger binder content.…”

Section: Phase Analysissupporting

confidence: 82%

“…Annealed LaFe 11.6 Si 1.4 flakes were prepared following the procedure described in our previous work [41]. The Ce 2 Co 7 compounds were prepared by an arc melting process with pure Ce (≥99.5 wt.%) and Co (≥99.9 wt.%).…”

Section: Methodsmentioning

confidence: 99%

“…For example, addition of more than 5 wt.% of La-Al alloy was detrimental to 1:13 phase formation in La-Fe-Si/La-Al composites [40]. Our previous work [41] showed that excess addition of Ce-Co alloy binder would result in the formation of a new phase, which disappeared with increasing heat treatment time. However, the sintering temperature is below the melting point of Ce 40 Co 60 (1323 K), resulting in a porous structure and insufficient mechanical properties.…”

Section: Introductionmentioning

confidence: 93%

See 2 more Smart Citations

One-Step Sintering Process for the Production of Magnetocaloric La(Fe,Si)13-Based Composites

Zhong

Dong

Huang

et al. 2022

Metals

Self Cite

View full text Add to dashboard Cite

A one-step sintering process was developed to produce magnetocaloric La(Fe,Si)13/Ce-Co composites. The effects of Ce2Co7 content and sintering time on the relevant phase transformations were determined. Following sintering at 1373 K/30 MPa for 1–6 h, the NaZn13-type (La,Ce)(Fe,Co,Si)13 phase formed, the mass fraction of α-Fe phase reduced and the CeFe7-type (La,Ce)(Fe,Co,Si)7 phase appeared. The mass fraction of the (La,Ce)(Fe,Co,Si)7 phase increased, and the α-Fe phase content decreased with increasing Ce2Co7 content. However, the mass fraction of the (La,Ce)(Fe,Co,Si)7 phase reduced with increasing sintering time. The EDS results showed a difference in concentration between Co and Ce at the interphase boundary between the 1:13 phase and the 1:7 phase, indicating that the diffusion mode of Ce is reaction diffusion, while that of Co is the usual vacancy mechanism. Interestingly, almost 100 % single phase (La,Ce)(Fe,Co,Si)13 was obtained by appropriate Ce2Co7 addition. After 6 h sintering at 1373 K, the Ce and Co content in the (La,Ce)(Fe,Co,Si)13 phase increased for larger Ce2Co7 content. Therefore, the Curie temperature increased from 212 K (binder-free sample) to 331 K (15 wt.% Ce2Co7 sample). The maximum magnetic entropy change (−∆SM)max decreased from 8.8 (binder-free sample) to 6.0 J/kg∙K (15 wt.% Ce2Co7 sample) under 5 T field. High values of compressive strength (σbc)max of up to 450 MPa and high thermal conductivity (λ) of up to 7.5 W/m∙K were obtained. A feasible route to produce high quality La(Fe,Si)13 based magnetocaloric composites with large MCE, good mechanical properties, attractive thermal conductivity and tunable TC by a one-step sintering process has been demonstrated.

show abstract

Section: Phase Analysissupporting

confidence: 82%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

See 1 more Smart Citation

One-Step Sintering Process for the Production of Magnetocaloric La(Fe,Si)13-Based Composites

Zhong

Dong

Huang

et al. 2022

Metals

Self Cite

View full text Add to dashboard Cite

show abstract

“…This potential of nanoscale phase separation in enlarging the RC has been suggested by a study of ball-milled La(Fe,Co,Si) 13 material, where ferromagnetic phases with different Si concentrations are mechanically mixed. A second example is provided by a study of a hot-pressed LaFe 11.6 Si 1.4 /Ce 40 Co 60 bulk composite . In that composite, both the FM and IEM transitions are extended over a wide range of temperatures.…”

Section: Discussionmentioning

confidence: 99%

“…A second example is provided by a study of a hot-pressed LaFe 11.6 Si 1.4 /Ce 40 Co 60 bulk composite. 52 In that composite, both the FM and IEM transitions are extended over a wide range of temperatures. According to the present study, the bulk composite is very likely to be comprised by a mixture of NaZn 13 -type phases with varied x.…”

Section: Phase Coexistence and Magnetovolume Effectsmentioning

confidence: 99%

Nanoscale Phase Separation and Large Refrigerant Capacity in Magnetocaloric Material LaFe_11.5Si_1.5

Huang

Brown

et al. 2021

Chem. Mater.

View full text Add to dashboard Cite

Ferromagnetic transitions, the magnetocaloric effect, and the atomic-scale microstructure in an annealed bulk material of LaFe 11.5 Si 1.5 were investigated using magnetic measurements, Mossbauer spectroscopy, high-resolution X-ray diffraction analysis, and high-resolution transmission electron microscopy. The results provide evidence of the coexistence of two ferromagnetic phases with different Curie temperatures. The phase with a Curie temperature of 216 K corresponds to a Sirich phase of a NaZn 13 -type structure with a small lattice volume, whereas the phase with a Curie temperature of 185 K corresponds to a Si-poor phase of a NaZn 13 -type structure with a large lattice volume. This phase coexistence is observed on a nanometer scale and it can account for inverse thermal hysteresis of the ferromagnetic transition in the Si-rich phase during warming. Furthermore, the phase coexistence helps the bulk material achieve a refrigeration capacity of 170 J kg −1 due to a combination of the magnetocaloric effect in each phase. It is determined that the magnetocaloric effect in the Si-rich and the Si-poor phase brings about a maximum of the total entropy change of −3.55 and −6.80 and J kg −1 K −1 at respective Curie temperatures, respectively. Fundamentally, the phase coexistence indicates coloring of Si atoms in the lattice of a NaZn 13 -type structure and can be attributed to nanoscale phase separation of a disordered precursor during annealing of the bulk material. The nanoscale phase separation may occur in other magnetocaloric materials, thus allowing for improvement of their refrigeration capacity.

show abstract

High‐Throughput Screening of High‐Performance Magnetocaloric Materials by Gradient Additive Manufacturing

Xie,

Liang,

Qin

et al. 2024

Adv Funct Materials

View full text Add to dashboard Cite

Magnetic refrigeration based on magnetocaloric effect (MCE) has become a promising cooling technology to replace the traditional vapor compression refrigeration. However, traditional methods for searching MCE materials require producing many different compositions, causing unbearable workload and long experimental periods. Here, 3D printed La0.7Ce0.3Fe11.65Si1.35–Fe compositionally gradient alloys (CGAs) are successfully prepared using laser powder bed fusion equipped with a powder hopper with dual‐bin structure. This CGAs accelerate the high‐throughput screening for the best composition of La(Fe, Si)13/Fe with both high MCE and mechanical properties. The good interfacial compatibility between brittle 1:13 phase and reinforcing α‐Fe improves the mechanical properties significantly. Even after hydrogenation, the compressive strength and ultimate strain of the La(Fe, Si)13/Fe hydrides are ≈220% and ≈150% higher than those of stoichiometric La(Fe, Si)13. Meanwhile, the hydrogenated composite exhibits a large MCE under low magnetic field, e.g., the magnetic entropy change |ΔSM|max of 7.6 J kg−1 K−1 under 2 T is 52% higher than that of the benchmark Gd (5.0 J kg−1 K−1). Furthermore, this La(Fe, Si)13/Fe is 3D printed into various complex shapes suitable for heat exchangers. This study provides an innovative strategy for high‐throughput screening of new materials.

show abstract

Table-like magnetocaloric effect and enhanced refrigerant capacity of HPS La(Fe,Si)13-based composites by Ce–Co grain boundary diffusion

Cited by 28 publications

References 41 publications

One-Step Sintering Process for the Production of Magnetocaloric La(Fe,Si)13-Based Composites

One-Step Sintering Process for the Production of Magnetocaloric La(Fe,Si)13-Based Composites

Nanoscale Phase Separation and Large Refrigerant Capacity in Magnetocaloric Material LaFe_11.5Si_1.5

High‐Throughput Screening of High‐Performance Magnetocaloric Materials by Gradient Additive Manufacturing

Contact Info

Product

Resources

About

Table-like magnetocaloric effect and enhanced refrigerant capacity of HPS La(Fe,Si)13-based composites by Ce–Co grain boundary diffusion

Cited by 28 publications

References 41 publications

One-Step Sintering Process for the Production of Magnetocaloric La(Fe,Si)13-Based Composites

One-Step Sintering Process for the Production of Magnetocaloric La(Fe,Si)13-Based Composites

Nanoscale Phase Separation and Large Refrigerant Capacity in Magnetocaloric Material LaFe11.5Si1.5

High‐Throughput Screening of High‐Performance Magnetocaloric Materials by Gradient Additive Manufacturing

Contact Info

Product

Resources

About

Nanoscale Phase Separation and Large Refrigerant Capacity in Magnetocaloric Material LaFe_11.5Si_1.5