Thermal Stability of Platinum–Cobalt Bimetallic Nanoparticles: Chemically Disordered Alloys, Ordered Intermetallics, and Core–Shell Structures

2017 ◽  
Vol 9 (14) ◽  
pp. 12486-12493 ◽  
Author(s):  
Rao Huang ◽  
Gui-Fang Shao ◽  
Yang Zhang ◽  
Yu-Hua Wen
Keyword(s):  
Thermal Stability ◽  
Bimetallic Nanoparticles ◽  
Shell Structures ◽  
Core Shell ◽  
Disordered Alloys ◽  
Thermal Stability Of

scholarly journals Optimized Microstructure and Improved Magnetic Properties of Pr-Dy-Al-Ga Diffused Sintered Nd-Fe-B Magnets

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2583
Author(s):  
Pengpeng Qu ◽  
Feifei Li ◽  
Sajjad Ur Rehman ◽  
Lei He ◽  
Xiaoqiang Yu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Magnetic Properties ◽  
Rare Earth ◽  
Grain Boundary ◽  
Diffusion Process ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion ◽  
Shell Structures ◽  
Core Shell ◽  
Thermal Stability Of

The grain boundary diffusion process (GBDP) has become an important technique in improving the coercivity and thermal stability of Dy-free sintered Nd-Fe-B magnets. The influence of Dy70Al10Ga20 and (Pr75Dy25)70Al10Ga20 alloys by the GBDP on sintered Nd-Fe-B magnets are investigated in this paper. After diffusing Dy70Al10Ga20 and (Pr75Dy25)70Al10Ga20 alloys, the coercivity (Hcj) of the magnets increased from 13.58 kOe to 20.10 kOe and 18.11 kOe, respectively. Meanwhile, the remanence of the magnets decreased slightly. The thermal stability of the diffused magnets was improved by the GBDP. The microstructure shows continuous Rare-earth-rich (RE-rich) grain boundary phases and (Dy, Pr/Nd)2Fe14B core-shell structures which contribute to improving the coercivity. Moreover, the Dy concentration on the surface of the (Pr75Dy25)70Al10Ga20 diffused magnets decreased with the Pr substitution for the Dy element. The openness of the recoil loops for the (Pr75Dy25)70Al10Ga20 diffused magnets is smaller than that of the original magnets and Dy70Al10Ga20 diffused magnets. The results show that the (Pr75Dy25)70Al10Ga20 alloys can effectively optimize the microstructure and improve the magnetic properties and thermal stability of the sintered Nd-Fe-B magnets.

High thermal stability of core–shell structures dominated by negative interface energy

2017 ◽  
Vol 19 (13) ◽  
pp. 9253-9260 ◽  
Author(s):  
Yong-Fu Zhu ◽  
Ning Zhao ◽  
Bo Jin ◽  
Ming Zhao ◽  
Qing Jiang
Keyword(s):  
Thermal Stability ◽  
Heat Capacity ◽  
Thermal Expansion ◽  
Interface Energy ◽  
High Thermal Stability ◽  
Shell Structures ◽  
Atomic Diffusion ◽  
Core Shell ◽  
Thermal Stability Of

Superheating of the low-Tm(∞)-core is induced by the negative interface energy, improving thermal expansion, atomic diffusion and heat capacity accordingly.

Atomic Structure of Bimetallic Nanoparticles in PtAg/C Catalysts: Determination of Components Distribution in the Range from Disordered Alloys to “Core–Shell” Structures

2015 ◽  
Vol 119 (6) ◽  
pp. 3217-3227 ◽  
Author(s):  
Vasiliy V. Pryadchenko ◽  
Vasiliy V. Srabionyan ◽  
Elena B. Mikheykina ◽  
Leon A. Avakyan ◽  
Vadim Y. Murzin ◽  
...  
Keyword(s):  
Atomic Structure ◽  
Bimetallic Nanoparticles ◽  
Shell Structures ◽  
Core Shell ◽  
Disordered Alloys

Atomic structure and thermal stability of Pt–Fe bimetallic nanoparticles: from alloy to core/shell architectures

2016 ◽  
Vol 18 (25) ◽  
pp. 17010-17017 ◽  
Author(s):  
Rao Huang ◽  
Yu-Hua Wen ◽  
Gui-Fang Shao ◽  
Shi-Gang Sun
Keyword(s):  
Molecular Dynamics ◽  
Thermal Stability ◽  
Molecular Dynamics Simulations ◽  
Atomic Structure ◽  
Bimetallic Nanoparticles ◽  
Structure Evolution ◽  
Core Shell ◽  
Dynamics Simulations ◽  
Thermal Stability Of

Molecular dynamics simulations are used to investigate structure evolution and thermal stability of Pt–Fe bimetallic nanoparticles with different architectures.

PdPt bimetallic nanoparticles enabled by shape control with halide ions and their enhanced catalytic activities

Nanoscale ◽  
2016 ◽  
Vol 8 (7) ◽  
pp. 3962-3972 ◽  
Author(s):  
Jinfeng Zhang ◽  
Lei Wan ◽  
Lei Liu ◽  
Yida Deng ◽  
Cheng Zhong ◽  
...  
Keyword(s):  
Shape Control ◽  
Bimetallic Nanoparticles ◽  
Shell Structures ◽  
Core Shell ◽  
Halide Ions ◽  
Catalytic Activities

The morphologies of PdPt nanoparticles with various core–shell structures could be controlled by altering the participation of different halide ions.

Phase Transfer Identification of Core–Shell Structures in Ag–Au Bimetallic Nanoparticles

2005 ◽  
Vol 5 (7) ◽  
pp. 1095-1100 ◽  
Author(s):  
J. Yang ◽  
Jim Yang Lee ◽  
L. X. Chen ◽  
Heng-Phon Too
Keyword(s):  
Bimetallic Nanoparticles ◽  
Phase Transfer ◽  
Shell Structures ◽  
Core Shell

Phase-Transfer Identification of Core-Shell Structures in Bimetallic Nanoparticles

Plasmonics ◽  
2006 ◽  
Vol 1 (1) ◽  
pp. 67-78 ◽  
Author(s):  
Jun Yang ◽  
Jim Yang Lee ◽  
Heng-Phon Too
Keyword(s):  
Bimetallic Nanoparticles ◽  
Phase Transfer ◽  
Shell Structures ◽  
Core Shell
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