Tailoring of highly-stable Mn1-x-y(CexLay)O2-δ pseudocapacitor thin-film and rare earth oxide nanospheres through selective purification of rare earth oxides derived from Ni-MH batteries

2022 ◽  
Author(s):  
Samane Maroufi ◽  
Sajjad S. Mofarah ◽  
Rasoul Khayyam Nekouei ◽  
Veena Sahajwalla
Keyword(s):  
Thin Film ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
State Of The Art ◽  
Rare Earth Oxide ◽  
Rare Earth Oxides

Growing utilisation of rare earth elements (REEs) has caused serious shortages in REEs’ supply and shifting state-of-the-art approaches toward sustainable recycling of existing REEs. The present work details a three-stage...

Orientation Control of Perovskite Epitaxial Thin Film on Silicon Substrate with Yttria-Stabilized Zirconia Buffer Layers

2006 ◽  
Vol 320 ◽  
pp. 69-72 ◽  
Author(s):  
Masao Kondo ◽  
Kazuaki Kurihara
Keyword(s):  
Thin Film ◽  
Rare Earth ◽  
Buffer Layer ◽  
Layer Structure ◽  
Rare Earth Oxide ◽  
Calcium Titanate ◽  
Rare Earth Oxides ◽  
Yttria Stabilized Zirconia ◽  
Buffer Layers ◽  
Stabilized Zirconia

The influence of a rare earth oxide/yttria-stabilized zirconia (YSZ) double buffer layer structure on the orientation of a perovskite thin film was investigated on (100) silicon substrates. A calcium titanate perovskite film with a mixture of (110) and (100) orientation was grown epitaxially on a YSZ buffer layer. Since rare earth oxides have almost the same chemical nature and different lattice parameters, it is anticipated that the lattice parameter of the buffer layer can be controlled by changing the rare earth element. An (100) oriented epitaxial calcium titanate film was obtained by changing the composition of rare earth oxides on the YSZ/Si substrate.

INFLUENCE OF ADDITION OF RARE EARTH ELEMENTS ON THERMAL BARRIER COATINGS MICRO STRUCTURAL EVOLUTION

2006 ◽  
Vol 20 (25n27) ◽  
pp. 4010-4015 ◽  
Author(s):  
XIAOJUAN JI ◽  
QIULI WEI ◽  
CHUNGEN ZHOU ◽  
SHENGKAI GONG ◽  
HUIBIN XU
Keyword(s):  
Rare Earth ◽  
Thermal Diffusivity ◽  
Rare Earth Elements ◽  
Lattice Distortion ◽  
Oscillation Amplitude ◽  
Structural Evolution ◽  
Rare Earth Oxide ◽  
Thermal Barrier ◽  
Barrier Effect ◽  
Lattice Oscillation

Decreasing thermal diffusivity of YSZ can increase the thermal barrier effect. Thermal diffusivity is in direct proportion to lattice oscillation amplitude and frequency. The addition of rare earth oxide into YSZ may induce the lattice distortion, which will result in the change of lattice oscillation frequency. In the present work, combined with the experiment, a theoretical study was proposed to investigate the effect of the rare earth elements on the thermal barrier effect of YSZ using first-principal calculations implemented CASTEP program. It has been found that the addition of the rear earth element can make larger lattice distortion and favorable to reduce the thermal conductivity. The calculation results are in agreement with our experimental results.

REE and TRU Incorporation into Monazite Structure Ceramics

2004 ◽  
Vol 824 ◽  
Author(s):  
S. I. Rovnyi ◽  
G. M. Medvedev ◽  
A. S. Aloy ◽  
T. I. Koltsova ◽  
S. E. Samoylov
Keyword(s):  
Thin Film ◽  
Solid Solution ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Chemical Durability ◽  
Spent Fuel ◽  
Waste Streams ◽  
Oxalate Precipitation ◽  
Spent Fuel Reprocessing ◽  
Fuel Reprocessing

AbstractOne of the high levels of actinide, and in particular Cm, waste streams at the Russian radiochemical Production Association (PA) Mayak was generated during spent fuel reprocessing. Using oxalate precipitation, the rare earth elements (REE) and transuranic elements (TRU) settled out in the form of oxalate residues. Due to in high REE contents in this residue, the mineral-like matrix based on (REE)PO4 solid solution, with monlclinic monazite structure have been proposed to use as a suitable ceramics form for final actinide immobilization. For this purpose the synthetic REE oxalates were first transformed into REE orthophosphates in a thin-film evaporator (TFE). Then the (REE)PO4 powder was compacted both by either hot uniaxial pressing (HUP) or cold uniaxial pressing followed by sintering (CUP). This ceramic with the monazite structure has a high density and exhibits chemical durability by leaching.

Lanthanide rare earth oxide thin film as an alternative gate oxide

2017 ◽  
Vol 68 ◽  
pp. 302-315 ◽  
Author(s):  
Kian Heng Goh ◽  
A.S.M.A. Haseeb ◽  
Yew Hoong Wong
Keyword(s):  
Thin Film ◽  
Rare Earth ◽  
Rare Earth Oxide ◽  
Gate Oxide ◽  
Oxide Thin Film

Nano Crystallite ZrO2, La2O3 and CeO2: Synthesis, Characterization and their Properties

2013 ◽  
Vol 209 ◽  
pp. 212-215
Author(s):  
A.K. Patel ◽  
A.R. Umatt ◽  
B.S. Chakrabarty
Keyword(s):  
Rare Earth ◽  
Surface Area ◽  
Gas Adsorption ◽  
Chemical Properties ◽  
Rare Earth Oxide ◽  
Combustion Method ◽  
Rare Earth Oxides ◽  
Precipitation Method ◽  
Reaction Conditions ◽  
The Rare Earth

It is well known that a minor addition of rare earth oxides can provide a beneficial effect towards various catalytic reactions. Use of rare earth oxide in different applications could improve commercial productivity in an affordable way. Among the rare earth oxides, ZrO2, La2O3 and CeO2 are very interesting due to their various characteristics showing a large range of applications in organic reactions. The changes in the molecular properties of materials at the nano scale level greatly enhance their physical properties as well as chemical properties and activity. Due to the extremely small size of the particles, an increased surface area is provided to the reactant enabling more molecules to react at the same time, thereby speeding up the process. In this work, the enhancement in the catalytic activity of these nano structured rare earth oxides has been studied under different reaction conditions. Nano crystalline ZrO2, La2O3 and CeO2 samples were synthesized using precipitation method and optimum reaction conditions have been established; whereas the corresponding bulk samples were synthesized by combustion method. The identification of phase and crystalline size of synthesized oxides have been done by X-ray diffraction, the band gape of these three oxides in both the forms has been analyzed by UV absorbance and surface area has been determined by gas adsorption analysis (BET). Moreover their different properties and the activity of nano crystallite oxides have also been compared with their bulk counterparts. Even the activity of ZrO2 is also compared with the rare earth oxides La2O3 and CeO2.

scholarly journals An Experimental Investigation of the Dielectric Properties of Thermally Evaporated Rare Earth Oxides for Use in Thin Film Capacitors

1976 ◽  
Vol 3 (1) ◽  
pp. 51-62 ◽  
Author(s):  
A. T. Fromhold, Jr. ◽  
W. D. Foster
Keyword(s):  
Thin Film ◽  
Experimental Investigation ◽  
Rare Earth ◽  
Dielectric Properties ◽  
Dielectric Breakdown ◽  
Rare Earth Oxides ◽  
Dielectric Constants ◽  
Thin Film Capacitors ◽  
Aluminum Electrodes ◽  
Experimental Survey

An experimental survey of rare earth oxides for use in thin film capacitors has been completed. Dielectric properties measured at 300°K are reported for thermally evaporated oxides 300 to 6000 Å in thickness of the metals, La, Ce, Pr, Nd, Sm, Gd, Dy, Ho, Er, Yb, Y, Sc, and also, V. Thin evaporated aluminum electrodes were utilized to impress voltages in the range zero to 75 V across the oxide layers. Dielectric breakdown strengths in excess of 5 × 106V/cm were observed. Relative dielectric constants measured for the oxides range from two to twenty, and measured capacitances were as high as 156 × 10−9F/cm2. The oxides of Ce, La, Nd, Gd, Pr, and Er show the most promise as potential materials for use in thin film capacitors.

Effect of Re Addition on the Ignition Resistance of Pure Magnesium

2014 ◽  
Vol 788 ◽  
pp. 88-92 ◽  
Author(s):  
Jian Ding ◽  
Zheng Fang ◽  
Lin Qin ◽  
Wei Min Zhao
Keyword(s):  
Rare Earth ◽  
Magnesium Alloy ◽  
Oxide Film ◽  
Rare Earth Elements ◽  
Oxidation Resistance ◽  
Rare Earth Oxide ◽  
Pure Magnesium ◽  
Ignition Point ◽  
The Rare Earth

This paper focus on the effect of rare earth elements addition on the oxidation resistance of pure magnesium. The results show that the ignition points of the Mg-RE alloys vary like “V” along with the increase of the rare earth elements. When the content of Y reaches 10wt%, the ignition point of magnesium alloy is 890K, about 40K higher than the ignition point of pure magnesium. After the addition of rare earth elements, dense oxide film forms on the surface of Mg-RE alloys. The outer oxidation film mainly consists of rare earth oxide.

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