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Takahashi, Hidekazu; Munakata, Fumio; Yamanaka, Mitsugu

doi:10.1103/physrevb.57.15211

Cited by 103 publications

(47 citation statements)

References 43 publications

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“…On the other hand, the reverse bias current is characterized by a reverse threshold voltage of ~4.2V at 40ºC and decrease to ~3V at 80ºC. It has been reported that the chemically stoichiometric La 0.5 Sr 0.5 CoO 3 behaviour like a metal without energy gap [22]. The reverse threshold voltage is ascribed to the difference of the Fermi energies between LSCO and VO 2 .…”

Section: Resultsmentioning

confidence: 99%

Electrical Conducting Behavior of W- Doped VO2 Thin Films / La0.5Sr0.5CoO3Heterostructure

Lin¹,

Hu²,

Liu³

2013

IJCEA

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Abstract-W-doped vanadium oxide thin films were obtained by sol-gel spin coating process on the pre-heat treated silicon wafer. The precursor for thin film coating is prepared with vanadium methanol solution. These films were post annealed at 580ºC for 30 min under controlled air pressure. The average thickness of the films was about 60 nm. The predominant phase of the films is monoclinic VO 2 from Raman spectra analysis. These thin films exhibit a metal-semiconducting transition. The transition temperature was lowered from 68ºC to 34ºC by doping with tungsten cation with 15%W.

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Section: Resultsmentioning

confidence: 99%

Electrical Conducting Behavior of W- Doped VO2 Thin Films / La0.5Sr0.5CoO3Heterostructure

Lin¹,

Hu²,

Liu³

2013

IJCEA

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“…For example, cobaltites exhibit a significant weight loss when the annealing temperature is higher 1000°C (in some cases 800°C) and a higher resistivity and oxygen diffisivity were observed in femtes. 43,44 Further study was then performed on the electrical conductivity of La0.60Sro.de03 at the low pO2, in which oxygen vacancy concentrations were increased. Figure 3 shows the plot of log(@ vs. log(p02) at 1000°C with a control over the oxygen activity being made by using a mixture of COICO2, fiom which the pO2 can be determined thermodynamically.…”

Section: Methodsmentioning

confidence: 99%

“…In selected applications, cellulose membranes could become a cost-effective, environmentally friendly alternative to other more commonly employed membrane polymers. Keywords: membranes; cellulose; morphology; phase separation; natural polymers; 43 …”

mentioning

confidence: 99%

Microporous and Thin Film Membranes for Solid Oxide Fuel

Anderson¹

2007

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1.0: Status of Program 1) Executive SummaryOne of the major limitations to the commercialization of solid oxide fuel cells is the expense of fabricating the required (anode/electrolyte/cathode) cells (currently planar or tubular). The current technology being employed by most of the producers of solid oxide fuel cells is essentially all the same in that it involves standard ceramic processing to make composite structures (either electrolyte or electrode supported). Each investigator/program has their own individual processing steps to produce the cells, but in the end, they all make these cells in a very similar manner. As a result only limited progress has been made towards cost reductions over the last 2-3 decades. It is our contention that major changes in the processing of cells need to be made before SOFCs can become economically feasible.Over a decade ago, Aker Industries (AI) demonstrated that it was possible to imbibe metal salts into cellulose (paper, paper products, cardboard, etc) and subsequently pyrolize the resulting composites at relatively low temperatures, <1000 C, to form both microporous and dense structures which replicated the original paper structures. These results are very significant in the fact that they suggest that it might be possible to fabricate the cells needed for SOFCs by using the well established technology of the paper industry. If this is possible, then it may be the vehicle to allow the manufacturing cost of SOFCs to be significantly decreased.The overall objective of this program was to expand the work of AI to: 1) learn how to synthesis both dense and porous cellulose films using cellulose polymer and/or cellulose derivatives; 2) develop the protocol to imbibe these films with metal salts to yield organic/inorganic hybrid (OIH) structures which can be pyrolized to form oxide replicas of themselves; 3) investigate the possibility of producing the trilayer (cathode/electrolyte/anode or PEN) SOFC structures and 4) demonstrate the innovative technology by fabricating a SOFC.This program required a joint effort of a five-member team comprising the University of Missouri-Rolla (UMR), the Lawrence Berkeley National Laboratory (LBNL), the National Renewable Energy Laboratory (NREL), the University of Colorado-Boulder (UCB) and Aker Industries (AI). Each team member played a key role in the program: 1) NREL and UCB synthesized dense and porous cellulose films and developed the protocol for imbibing salts into the films; 2) UMR, UCB and NREL studied the pyrolysis of the OIH structures to form oxide films; 3) LBNL, UMR and AI focused on characterizing and producing the PEN structures and using them to produce SOFCs; and 4) UMR lead the program, developed cathode and anode compositions and studied alternate ways of preparing the PEN structures.The results of the program were mixed so that not all of the goals were met:Successes:• NREL/UCB successfully synthesized dense and porous cellulose films from both Catcel-5 and Rayonier cellulose and were able to imbibe metal salts into the re...

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“…This interrelationship is shown in the (La, Sr)(Fe, Co)O 3-δ system. For 20% Co compound, electrons (holes) move indirectly between Co ions via an O ion rather than directly between Co ions, i.e., the fluctuation of the charges of O ions as well as Co ion causes electrons (holes) to move with a complicated interaction between the generated holes and electrons 4 . The effects of Fe doping in La 0.67 Sr 0.33 CoO 3 5 showed that no apparent structure change was introduced by Fe doping up to x = 0.3, but the Curie temperature T c , magnetization M and electrical resistivity are lowered by Fe substitution.…”

Section: Further Studiesmentioning

confidence: 99%

“…Grain structure and atomic segregation (University of Illinois -Chicago) 3. Phase stability and stress development (University of Missouri -Rolla) 4. Mechanical property evaluation in thermal and chemical stress fields (University of Alaska Fairbanks)…”

Section: Executive Summarymentioning

confidence: 99%

Oxygen Transport Ceramic Membranes

Bandopadhyay¹,

Nagabhushana²

2003

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In the present quarter, the possibility of using a more complex interfacial engineering approach to the development of reliable and stable oxygen transport perovskite ceramic membranes/metal seals is discussed. Experiments are presented and ceramic/metal interactions are characterized.Crack growth and fracture toughness of the membrane in the reducing conditions are also discussed. Future work regarding this approach is proposed are evaluated for strength and fracture in oxygen gradient conditions. Oxygen gradients are created in tubular membranes by insulating the inner surface from the reducing environment by platinum foils. Fracture in these test conditions is observed to have a gradient in trans and inter-granular fracture as opposed to pure trans-granular fracture observed in homogenous conditions. Fracture gradients are reasoned to be due to oxygen gradient set up in the membrane, variation in stoichiometry across the thickness and due to varying decomposition of the parent perovskite. The studies are useful in predicting fracture criterion in actual reactor conditions and in understanding the initial evolution of fracture processes.iii DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warrantee, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of the authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.iv Executive SummaryConversion of natural gas to liquid fuels and chemicals is a major goal for the Nation as it enters the 21 st Century. Technically robust and economically viable processes are needed to capture the value of the vast reserves of natural gas on Alaska's North Slope, and wean the Nation from dependence on foreign petroleum sources. Technologies that are emerging to fulfill this need are all based syngas as an intermediate. Syngas (a mixture of hydrogen and carbon monoxide) is a fundamental building block from which chemicals and fuels can be derived. Lower cost syngas translates directly into more cost-competitive fuels and chemicals.The currently practiced commercial technology for making syngas is either steam methane reforming (SMR) or a two-step process involving cryogenic oxygen separation followed by natural gas partial oxidation (POX). These high-energy, capital-intensive processes do not always produce syngas at a cost that makes its derivatives competitive with current...

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Ab initiostudy of the electronic structures inLaCoO3−SrCoO

Cited by 103 publications

References 43 publications

Electrical Conducting Behavior of W- Doped VO2 Thin Films / La0.5Sr0.5CoO3Heterostructure

Electrical Conducting Behavior of W- Doped VO2 Thin Films / La0.5Sr0.5CoO3Heterostructure

Microporous and Thin Film Membranes for Solid Oxide Fuel

Oxygen Transport Ceramic Membranes

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