The Metal - Oxide Composite [Fe0.2Co0.8]0.8[Fe2.38Co0.62O4]: Hrtem and EDX Characterization

1994 ◽  
Vol 346 ◽  
Author(s):  
J. C Yamegni Noubeyo ◽  
A. Malats I Riera ◽  
J. Werckmann ◽  
G. Pourroy ◽  
G. Ehret ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Cobalt Chloride ◽  
Vacuum Annealing ◽  
Cobalt Metal ◽  
Oxide Composite ◽  
Before And After ◽  
Cationic Exchange ◽  
Amorphous Nanoparticles

ABSTRACTThe new metal-ferrite composite [Fe0.2Co0.8]0.8[Fe2.38Co0.62O4] is obtained by precipitation of ferrous and cobalt chloride in KOH. Further heating under vacuum above 400°C shows a cationic exchange between metal and spinel leading to a new composite made up of cobalt metal and cobalt doped magnetite.HTERM and EDX observations have been carried out on both composites, i.e., before and after vacuum annealing, We show that cationic exchange occurs mainly in crystals made up of spinel, CoO and amorphous nanoparticles.

scholarly journals Impedance Spectroscopy of Lead-Free Ferroelectric Coatings

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 221
Author(s):  
Mariya Aleksandrova ◽  
Ivailo Pandiev
Keyword(s):  
Composite Coatings ◽  
Electrical Circuit ◽  
Ferroelectric Materials ◽  
Piezoelectric Transducers ◽  
Lead Free ◽  
Electrical Behavior ◽  
Oxide Composite ◽  
Before And After ◽  
Frequency Dependences ◽  
Good Agreement

This paper presents impedance measurements of ferroelectric structures involving lead-free oxide and polymer-oxide composite coatings for sensing and energy harvesting applications. Three different ferroelectric materials grown by conventional microfabrication technologies on solid or flexible substrates are investigated for their basic resonant characteristics. Equivalent electrical circuit models are applied to all cases to explain the electrical behavior of the structures, according to the materials type and thickness. The analytical results show good agreement with the experiments carried out on a basic types of excited thin-film piezoelectric transducers. Additionally, temperature and frequency dependences of the dielectric permittivity and losses are measured for the polymer-oxide composite device in relation with the surface morphology before and after introduction of the polymer to the functional film.

Role of the dopant (silver) inclusion on before and after core metal -oxide reaction: Application on textile dyes removal

2021 ◽  
pp. 109186
Author(s):  
Govindhasamy Murugadoss ◽  
Narthana Kandhasamy ◽  
Manavalan Rajesh Kumar ◽  
Abdullah K. Alanazi ◽  
Firoz Khan ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Textile Dyes ◽  
Before And After ◽  
Dyes Removal

Parameters for Nitrogen Diffusion in Ni, Ti, and Al Obtained from Implanted Bilayers

1992 ◽  
Vol 279 ◽  
Author(s):  
K. K. Bourdelle ◽  
D. O. Boerma
Keyword(s):  
Nuclear Reaction ◽  
Room Temperature ◽  
Vacuum Annealing ◽  
Nitride Layer ◽  
Nuclear Reaction Analysis ◽  
Nitrogen Diffusion ◽  
Depth Profiles ◽  
Solid Interface ◽  
Before And After ◽  
Concentration Depth Profiles

ABSTRACTNi foils and samples consisting of bilayers of Ni or Fe on Al, Ti or Si were implanted at room temperature with 15N+ ions to fluences of around 1×l017 N/cm2. The concentration depth profiles of 15N were determined with nuclear reaction analysis before and after vacuum annealing. It was found that the penetrability for N atoms of the surface and the solid/solid interface plays an important role in the N redistribution during implantation or annealing. The formation of a nitride layer or nitride clusters in Ni and Fe was deduced. Parameters for N migration determined for the metals under investigation are discussed in terms of models.

Nanoporous metal/metal-oxide composite prepared by one-step de-alloying AlNiCoYCu metallic glasses

2017 ◽  
Vol 703 ◽  
pp. 461-465 ◽  
Author(s):  
Hao Yang ◽  
Huajun Qiu ◽  
Jun-Qiang Wang ◽  
Juntao Huo ◽  
Xinmin Wang ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Metallic Glasses ◽  
Oxide Composite ◽  
Nanoporous Metal ◽  
Metal Metal ◽  
One Step

scholarly journals Synthesis of ZnO/CuO Composite by The Electrochemical Method in The Acetat Acid Solution

2018 ◽  
Vol 2 (2) ◽  
Author(s):  
Adrian Nur ◽  
Jundi Rofi’uddien ◽  
Muhammad Abdul Basir ◽  
Nazriati Nazriati ◽  
Fauziatul Fajaroh
Keyword(s):  
Solar Cell ◽  
Fuel Cell ◽  
Metal Oxide ◽  
Acid Solution ◽  
Functional Groups ◽  
Phase Structure ◽  
Electrochemical Method ◽  
Oxide Composite ◽  
Bacterial Agent ◽  
Oxide Composites

<p>The metal oxide composite is used to the microelectronic circuit, piezoelectric, fuel cell, sensor, catalyst, coating for preventing corrosion, and solar cell. The ZnO/CuO is one of the metal oxide composites. The combination of ZnO and CuO is the potential composite used to the catalyst and the anti-bacterial agent. The method used in this research was the electrochemical method in the acetate acid solution. The acetate acid solution used in this research is cheaper than the succinite acid used in the previous research. The electrochemical method has advantages due the easy to control and cheap. The composite resulted was analyzed by the XRD and the FTIR. The aims of this analysis are to know the crystallite phase, structure, and the functional groups of the particle resulted. The analysis showed that the ZnO-CuO composite can be resulted by the electrochemical method.</p>

Polymer–metal oxide composite nanofibers

2022 ◽  
pp. 89-109
Author(s):  
Zainab Ibrahim Elkahlout ◽  
Abdulrahman Mohmmed AlAhzm ◽  
Maan Omar Alejli ◽  
Fatima Zayed AlMaadeed ◽  
Deepalekshmi Ponnamma ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Composite Nanofibers ◽  
Oxide Composite ◽  
Polymer Metal

scholarly journals Performance of Flexible Chemoresistive Gas Sensors after Having Undergone Automated Bending Tests

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5190 ◽  
Author(s):  
Miriam Alvarado ◽  
Silvia De La Flor ◽  
Eduard Llobet ◽  
Alfonso Romero ◽  
José Luis Ramírez
Keyword(s):  
Metal Oxide ◽  
Gas Sensing ◽  
Flexible Substrate ◽  
Test Procedure ◽  
Chemical Vapor ◽  
Bending Test ◽  
Bending Tests ◽  
Ag Electrodes ◽  
Different Types ◽  
Before And After

Many sensors are developed over flexible substrates to be used as wearables, which does not guarantee that they will actually withstand being bent. This work evaluates the gas sensing performance of metal oxide devices of three different types, before and after having undergone automated, repetitive bending tests. These tests were aimed at demonstrating that the fabricated sensors were actually flexible, which cannot be taken for granted beforehand. The active layer in these sensors consisted of WO3 nanowires (NWs) grown directly over a Kapton foil by means of the aerosol-assisted chemical vapor deposition. Their response to different H2 concentrations was measured at first. Then, they were cyclically bent, and finally, their response to H2 was measured again. Sensors based on pristine WO3-NWs over Ag electrodes and on Pd-decorated NWs over Au electrodes maintained their performance after having been bent. Ag electrodes covered with Pd-decorated NWs became fragile and lost their usefulness. To summarize, two different types of truly flexible metal oxide gas sensor were fabricated, whereas a third one was not flexible, despite being grown over a flexible substrate following the same method. Finally, we recommend that one standard bending test procedure should be established to clearly determine the flexibility of a sensor considering its intended application.

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