La-Based Perovskites as Oxygen-Exchange Redox Materials for Solar Syngas Production

MRS Advances ◽  
2017 ◽  
Vol 2 (55) ◽  
pp. 3365-3370 ◽  
Author(s):  
Rahul R. Bhosale ◽  
Anand Kumar ◽  
Anchu Ashok ◽  
Parag Sutar ◽  
Gorakshnath Takalkar ◽  
...  
Keyword(s):  
Solution Combustion Synthesis ◽  
Scanning Transmission Electron Microscope ◽  
Bet Surface Area ◽  
Synthesis And Characterization ◽  
Solution Combustion ◽  
Syngas Production ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Synthesis Approach

ABSTRACTThis contribution reports the synthesis and characterization of La-based perovskites which can be used for the production of syngas via solar thermochemical splitting of H2O/CO2. The La-based perovskites were synthesized using a solution combustion synthesis approach. The derived perovskites were analyzed using powder X-ray diffractometer (PXRD), BET surface area analyzer (BET), and scanning/transmission electron microscope (SEM/TEM). The results associated with the synthesis and characterization of La-based perovskites is reported in detail.

Microstructural and Compositional Characterization of SiC-On-Insulator Structures

1999 ◽  
Vol 5 (S2) ◽  
pp. 770-771
Author(s):  
Manabu Ishimaru ◽  
Robert M. Dickerson ◽  
Kurt E. Sickafus
Keyword(s):  
Ion Implantation ◽  
Integrated Circuit ◽  
High Speed ◽  
Scanning Transmission Electron Microscope ◽  
Oxygen Ions ◽  
Oxygen Ion ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Oxygen Ion Implantation

As the size of Si integrated circuit structures is continually reduced, interest in semiconductor-oninsulator (SOI) structures has heightened. SOI structures have already been developed for Si using oxygen ion implantation. However, the application of Si devices is limited due to the physical properties of Si. As an alternative to Si, SiC is a potentially important semiconductor for high-power, high-speed, and high-temperature electronic devices. Therefore, this material is a candidate for expanding the capabilities of Si-based technology. In this study, we performed oxygen ion implantation into bulk SiC to produce SiC-on-insulator structures. We examined the microstructures and compositional distributions in implanted specimens using transmission electron microscopy and a scanning transmission electron microscope equipped with an energy-dispersive X-ray spectrometer (STEM-EDX).Figures 1(a) and 2(a) show bright-field images of 6H-SiC implanted with 180 keV oxygen ions at 650 °C to fluences of 7xl017 and 1.4xl018 cm−2, respectively. Three regions with distinct image contrast are apparent in Figs. 1(a) and 2(a), as indicated by A, B, and C.

Synthesis and Characterization of Novel AlF3 Cubes

NANO ◽  
2015 ◽  
Vol 10 (05) ◽  
pp. 1550071 ◽  
Author(s):  
Maoquan Xue ◽  
Changsheng Li
Keyword(s):  
Electron Microscopy ◽  
Synthesis And Characterization ◽  
Metal Fluoride ◽  
Controlled Synthesis ◽  
X Ray ◽  
Transmission Electron ◽  
Cubic Structure ◽  
Synthesis Approach ◽  
Scanning Electron

In this paper, regularly shaped AlF 3 particles with cubic structure were successfully synthesized via a solvothermal route. The as-prepared products were characterized by X-ray powder diffraction (XRD), energy-dispersive spectroscopy (EDS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The experimental results indicated that reaction temperature and time have significant effects on the morphology of the as-prepared products. A possible formation process has also been investigated on the basis of a series of XRD and SEM studies of the product obtained at different conditions. This well-controlled synthesis approach may be extended to fabricate other metal fluoride materials.

Elaboration and characterization of novel polyamide-12-layered titanoniobates nanocomposites

2009 ◽  
Vol 24 (11) ◽  
pp. 3358-3371 ◽  
Author(s):  
Sophie Chausson ◽  
Richard Retoux ◽  
Jean-Michel Rueff ◽  
Loïc LE Pluart ◽  
Pierre-Jean Madec ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Scanning Transmission Electron Microscope ◽  
Thermomechanical Properties ◽  
Polyamide 12 ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Before And After ◽  
Basic Reaction

This article describes the synthesis and the characterization of a polyamide-12 filled with a nanostructured organic/inorganic titanoniobate hybrid material. The pristine oxide KTiNbO5 has been successfully organomodified by N-alkyl amines via an acido-basic reaction after a cationic exchange step as shown by x-ray diffraction. Transmission electron microscope study and scanning transmission electron microscope observations have been used to describe the change of morphology of the nanofillers before and after processing; the micronic aggregates were changed into single sheets and dispersed in the polymer. Thermomechanical properties of the composites have been determined, and their analyses with structure-properties models are consistent with the exfoliation of the organomodified titanoniobates.

scholarly journals Characterization of Sc2O3&CeO2-Stabilized ZrO2 Powders Via Co-Precipitation or Hydrothermal Synthesis

2013 ◽  
Vol 19 (S5) ◽  
pp. 29-32 ◽  
Author(s):  
Justyna Grzonka ◽  
Victor Vereshchak ◽  
Oleksiy Shevchenko ◽  
Oleksandr Vasylyev ◽  
Krzysztof J. Kurzydłowski
Keyword(s):  
High Temperature ◽  
Hydrothermal Synthesis ◽  
Hydrothermal Reaction ◽  
Scanning Transmission Electron Microscope ◽  
Cubic Phase ◽  
Precipitation Technique ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Co Precipitation

AbstractAs the presence of Sc2O3 and CeO2 is known to largely enhance the ionic conductivity in the temperature range of 600–800°C, compared with the conventional yttria-stabilized ZrO2, Sc2O3&CeO2-stabilized ZrO2 provide its applicability as electrolytes in solid oxide fuel cells. The current study introduces the methodology to synthesize Sc2O3&CeO2-stabilized ZrO2 powders by using co-precipitation technique or high-temperature hydrothermal reaction, and further describes the structural characterization of the zirconia powders synthesized by the above-mentioned two methods. The co-precipitation technique was found to allow obtaining powders of cubic phase, whereas high-temperature hydrothermal synthesis results in the presence of a monoclinic phase as well. The scanning transmission electron microscope observations also confirm that the size of the synthesized ZrO2 powders in this study is found to be much smaller than that of commercially available powders.

The Characterization of Coal Structures for Coal Gasification Reactions Using Tem/Stem Techniques

1980 ◽  
Vol 38 ◽  
pp. 220-221
Author(s):  
J. A. Little ◽  
J. W. Evans ◽  
K. H. Westmacott
Keyword(s):  
Coal Gasification ◽  
Scanning Transmission Electron Microscope ◽  
Physical Parameters ◽  
Transmission Electron ◽  
Combined Use ◽  
Scanning Transmission ◽  
Gasification Reaction ◽  
Convergent Beam ◽  
Different Gases

The liquefaction and gasification of various coals are increasingly important technological utilizations of coal which are dependent upon its physical characteristics as well as its chemistry. In this respect, both the size and distribution of pores and the size, distribution and chemical identity of the submicron size minerals are physical parameters of great interest because of their probable influence in the coal conversion processes. In Berkeley, this study is proceeding by examination of such processes using an environmental cell in a high voltage microscope, by which the influence of different gases, temperatures and pressure upon the gasification reaction can be studied. An important first step in such a study is the primary characterization of the coals to be studied and the combined use of both transmission (TEM) and scanning transmission electron microscope (STEM) analyses utilizing both convergent beam methods and an energy dispersive X-ray analytical detector is thus a powerful tool in such a characterization.

Characterization of Precipitates in 3xxx Series Alloys with Zirconium

2015 ◽  
Vol 231 ◽  
pp. 81-85
Author(s):  
Mariusz Bigaj ◽  
Sonia Boczkal ◽  
Monika Mitka ◽  
Zbigniew Zamkotowicz ◽  
Janusz Żelechowski ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Electron Backscatter Diffraction ◽  
Scanning Transmission Electron Microscope ◽  
Phase Identification ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Backscatter Diffraction ◽  
Ebsd Method ◽  
Eds Microanalysis

The study presents the results of microstructure examinations and phase identification of precipitates in AlMn alloys containing zirconium after heat treatment and rolling. Chemical composition in microareas was determined by Energy Dispersive Spectrometry (EDS) microanalysis performed in Scanning Electron Microscope (SEM-EDS) and Scanning Transmission Electron Microscope (STEM-EDS) modes. Phase identification was carried out using Electron Backscatter Diffraction (EBSD) method. Studies have shown that Al6Mn and α- Al17(Fe3.2Mn0.8)Si2 phases were formed in the melt. Microstructure examined by TEM showed the presence of finely dispersed spherical precipitates of zirconium. In the alloy with an addition of silicon and magnesium, numerous precipitates of an Mg2Si phase were also found.

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