Polarization enhanced multi-grain-boundary dendritic micro–nano structure α-Fe for electromagnetic absorption applications: synthesis and characterization

RSC Advances ◽  
2015 ◽  
Vol 5 (32) ◽  
pp. 25266-25272 ◽  
Author(s):  
Zhenxing Yu ◽  
Zhongping Yao ◽  
Na Zhang ◽  
Zhaohua Jiang
Keyword(s):  
Rare Earth ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Rare Earth Ions ◽  
Synthesis And Characterization ◽  
Nano Structure ◽  
Suppression Effect ◽  
Electromagnetic Absorption ◽  
Absorption Performance

Multi-grain-boundary hierarchical dendritic micro–nano structure α-Fe was synthesized under the suppression effect of rare earth ions. These abundant grain boundaries contribute to the dramatic enhancement of electromagnetic absorption performance.

A self-assembly method for the fabrication of a three-dimensional (3D) polypyrrole (PPy)/poly(3,4-ethylenedioxythiophene) (PEDOT) hybrid composite with excellent absorption performance against electromagnetic pollution

2016 ◽  
Vol 4 (1) ◽  
pp. 82-88 ◽  
Author(s):  
Fan Wu ◽  
Mengxiao Sun ◽  
Wanchun Jiang ◽  
Kun Zhang ◽  
Aming Xie ◽  
...  
Keyword(s):  
Self Assembly ◽  
Hybrid Composite ◽  
Three Dimensional ◽  
Synthesis And Characterization ◽  
Assembly Method ◽  
Electromagnetic Absorption ◽  
Absorption Performance ◽  
Electromagnetic Pollution

Here we report the synthesis and characterization of a 3D-PPy/PEDOT composite, and examine its electromagnetic absorption (AE) performance.

Synthesis of hierarchical dendritic micro-nano structure CoxFe1−x alloy with tunable electromagnetic absorption performance

2013 ◽  
Vol 1 (40) ◽  
pp. 12462 ◽  
Author(s):  
Zhenxing Yu ◽  
Na Zhang ◽  
Zhongping Yao ◽  
Xiaojun Han ◽  
Zhaohua Jiang
Keyword(s):  
Nano Structure ◽  
Electromagnetic Absorption ◽  
Absorption Performance

Mechanism Research of Pr6O11 Addition on Wear Resistance of Alumina Ceramics

2015 ◽  
Vol 1104 ◽  
pp. 27-30
Author(s):  
Yang Wu ◽  
Bo Lin Wu ◽  
Si Long Bi
Keyword(s):  
Wear Resistance ◽  
Rare Earth ◽  
Grain Boundaries ◽  
Grain Growth ◽  
Interface Reaction ◽  
Rare Earth Ions ◽  
Alumina Ceramics ◽  
Composite Oxide ◽  
Influence Mechanism ◽  
Mechanism Research

Many literatures reported rare earth ions would segregate at grain boundaries toinhibit grain growth and improve the ceramic performance. However, the mutualinfluence between segregation and alumina grains was rarely seen in thereports. In this article, interface reaction between single crystal alumina (inorder to eliminate the influence of grain boundaries) and praseodymium oxidewas designed to further understand the influence mechanism. The resultssuggested that a composite oxide was formed at the junctions. Besides, largestresses produced between the composite oxide and alumina because of the thermalexpansion coefficient difference. This stresses would weaken grain boundariesbonding strength and reduce wear resistance.

scholarly journals The electronic origins of the “rare earth” texture effect in magnesium alloys

2021 ◽  
Author(s):  
Reza Mahjoub ◽  
Nikki Stanford
Keyword(s):  
Electronic Structure ◽  
Rare Earth ◽  
Grain Boundary ◽  
Ab Initio ◽  
Grain Boundaries ◽  
Magnesium Alloys ◽  
Ab Initio Simulations ◽  
Texture Effect ◽  
Complex Boundaries ◽  
Re Elements

Abstract Although magnesium alloys are lightweight, recyclable and relatively cheap, they suffer from poor ductility. This can be improved by the addition of rare earth (RE) elements, and this is now a well-established criterion for wrought alloy design. It is notable that this behavior is largely restricted to the lanthanides, but no hypothesis is yet available to explain why other elements do not have the same effect. To answer this question, ab initio simulations of crystallographically complex boundaries have been undertaken to examine the electronic origin of the RE effect. While the electronic structure provided strong bonding between the RE elements and their Mg surroundings, local disruption in atomic arrangement at the grain boundaries was found to diminish this effect. This work shows quantifiable changes in electronic structure of solutes resulting from grain boundary crystallography, and is suggested to be a contributing factor to the RE texture effect.

Alloying Behavior of Rare-Earth Er in Al-Cu-Mg-Ag Alloy

2007 ◽  
Vol 546-549 ◽  
pp. 941-946 ◽  
Author(s):  
Yun Tao Li ◽  
Zhi Yi Liu ◽  
Yan Bin Liu ◽  
Peng Dang ◽  
Qing Kun Xia ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Rare Earth ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Strength Test ◽  
Small Addition ◽  
Tensile Strength Test ◽  
Ω Phase ◽  
Peak Aging ◽  
Al Matrix

The alloying behavior of RE element of Er in Al-Cu-Mg-Ag alloys with addition of Er were investigated in this paper. During solidification ,most of element Er segregated at grain boundaries in the form of primary Al8Cu4Er phase and part of Er dissolved in the α-Al matrix. After rolling, Al8Cu4Er phase could be fragmentated into dispersed particle which leaded to an increase of the grain boundary strengthening . TEM observation and tensile strength test showed that small addition of Er retarded the precipitation of Ω phase and prolonged the time corresponding to the peak aging,with a remarkable increase of ductility.

Synthesis and characterization of novel thermoresponsive fluorescence complexes based on copolymers with rare earth ions

2013 ◽  
Vol 35 (12) ◽  
pp. 2250-2256 ◽  
Author(s):  
Guihua Cui ◽  
Shuiying Chen ◽  
Bao Jiang ◽  
Yan Zhang ◽  
Nannan Qiu ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Ions ◽  
Synthesis And Characterization

scholarly journals Effect of Reduced Atmosphere Sintering on Blocking Grain Boundaries in Rare-Earth Doped Ceria

Inorganics ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 63
Author(s):  
Soumitra Sulekar ◽  
Mehrad Mehr ◽  
Ji Hyun Kim ◽  
Juan Claudio Nino
Keyword(s):  
Activation Energy ◽  
Rare Earth ◽  
Ionic Conductivity ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Complex Impedance ◽  
Doped Ceria ◽  
Composite Electrodes ◽  
Boundary Conductivity ◽  
Rare Earth Doped

Rare-earth doped ceria materials are amongst the top choices for use in electrolytes and composite electrodes in intermediate temperature solid oxide fuel cells. Trivalent acceptor dopants such as gadolinium, which mediate the ionic conductivity in ceria by creating oxygen vacancies, have a tendency to segregate at grain boundaries and triple points. This leads to formation of ionically resistive blocking grain boundaries and necessitates high operating temperatures to overcome this barrier. In an effort to improve the grain boundary conductivity, we studied the effect of a modified sintering cycle, where 10 mol% gadolinia doped ceria was sintered under a reducing atmosphere and subsequently reoxidized. A detailed analysis of the complex impedance, conductivity, and activation energy values was performed. The analysis shows that for samples processed thus, the ionic conductivity improves when compared with conventionally processed samples sintered in air. Equivalent circuit fitting shows that this improvement in conductivity is mainly due to a drop in the grain boundary resistance. Based on comparison of activation energy values for the conventionally processed vs. reduced-reoxidized samples, this drop can be attributed to a diminished blocking effect of defect-associates at the grain boundaries

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