Perovskites material

O Connell M, Norman AK, Huttermann CF, Morris MA (1999) Catalytic oxidation over lanthanum-transition metal perovskite materials. Catal Today 47 123-132... 

Kim J-H, Peck D-H, Song R-H, Lee G-Y, Shin D-R, Hyun S-H, Wackerl J, and Hilpert K. Synthesis and sintering properties of (La Ca, 2 lSrx)Cr03 perovskite materials for SOFC interconnect. J. Electroceramics 2006 17 729-733. 

Permonosulfuric acid (PMS), 26 392 Permselective diaphragms, 9 656-657 Permutations, in Latin hypercube sampling, 26 1009-1010 Pernicious anemia, vitamin B12 and, 25 804 Perovskite carbides, 4 692 Perovskite ferrites, 22 55, 56t, 57 Perovskite material, mercury-base superconducting, 23 801 Perovskites, 5 590-591 22 94-96, 97 ... 

The previous discussion has focused on the properties of perovskite materials rather than on their performance as anodes. The number of actual fuel-cell studies is more limited, but this literature has been reviewed recently by Irvine. Various perovskites have been investigated as potential SOFC anode materials however, these early efforts were hampered by low electrochemical activity toward methane oxidation,poor anode structure,or insufficient electrode conductivity. Most recently, Tao and Irvine demonstrated that an anode based on (Lao.75Sro.25)o.9Cro.5Mno.503 can provide reasonable power densities at 1173 K in 3% humidified CH4. Barnett and co-workers also reported stable power generation with methane and propane fuels on an anode based on LaCr03 however, they reported that the addition of Ni, in levels too small to affect the conductivity, was crucial in providing activity for the electrochemical oxidation reactions. 

Perovskites. Materials of the formula ABO3 having the per-ovskite structure (32) can be prepared in a form containing lanthanum. Some perovskites containing cobalt and strontium, LaCoOa... 

Lumpkin, G. R Colella, M., Smith, K. L., Mitchell, R. H. Larsen, A. O. 1998a. Chemical composition, geochemical alteration, and radiation damage effects in natural perovskite. Materials Research Society Symposium Proceedings, 506, 207-214. 

According to all these considerations, the oxygen vacancy creation within the perovskite material at high cathodic polarization can be described by the following reaction... 

Perovskite Materials. Our studies of these materials are still in their infancy. An important feature of the perovskites is the ability to form many phases through shear planes where layers of a metal oxide can be inserted between multiple perovskite structure layers. Our work has shown that probe ions can be used to watch this process and we have been able to show that site selective laser spectroscopy is sensitive to all of the phases with a high sensitivity to even small concentrations. 

The oxygen electrode of the cells under analyses in our project is a perovskite material Ao.8Sr0.2Mn03 (element A is not disclosed because it is proprietary information). Scandia-stabilised zirconia (SSZ) is used as the electrolyte. The cathode consists of a Ni-SSZ cermet. Also, a lanthanum strontium cobaltite (La0.8Sr0.2CoO3, also known as LSC) is used as the bond layer. 

Another class of important materials with oxygen ion conduction are perovskites (see Section 2.4.4). Perovskite phases have been, initially, considered as possible electrode materials for SOFCs. The first report of the existence of oxide conductivity in a perovskite material was made using a calcium-doped lanthanum aluminate [98], But the discovery of attractive oxygen conduction properties is rather recent [84],... 

Perovskite materials show outstanding thermal and mechanical stability at temperatures typical for the performance of SOFCs in contrast with the standard Ni/YSZ cermet, where nickel sintering and agglomeration are latent risks [144],... 

On the other hand, the theoretical performance of concentration electrochemical cells, based on perovskite materials with protonic and oxygen ion conduction properties, has been described as well [191]. Besides, a sensor for the detection of oxidizable gases that employs the production of a non-Nemstian electrode potential, using zirconia as the solid electrolyte, has been developed [192],... 

A modern, non-stoichiometric, fuel-cell-oriented, perovskite material, Cco Gdo iOj 95 (COG), has been developed by Professor Steele at Imperial College London, as recorded in Steele etal. (2000a, b). Professor Steele has found the way, via COG, to a porous ferritic stainless steel, tubular or flat square IT/SOFC operating at 500 °C, superb achievement. 

Figure 42 Crystal structure of a pillared perovskite material, LasResMnOie. The grey and white octahedra represent the MnReOe site-ordered perovskite like layers and the black octahedra, the Re20io edge-sharing dimers. The white spheres show the La ion positions...

It has been reported that the dielectric constant of thin BST films decreases with decreasing film thickness when metal electrodes are adopted even without any interfacial non-perovskite material. This is due to the intrinsic interfacial low dielectric layer that originates from the termination of the chemical bonding of the perovskite structure at the interfaced. The large dielectric, polarizability of the perovskite can not penetrate into the metal layer due to the extremely high carrier concentration of the metal. 

The discovery of high-temperature superconductivity in a lanthanum-based cuprate perovskite material with a transition temperature of Tc = 35 K by Bednorz and Muller... 

Proton conductors with attractive conductivities are in the class of doped perovskite materials with the following compositions BaCeo.gNdo.iOs- and SrCeo.9Yo.1O3 and solid solutions of BaThOs and Nd203 . ... 

H.U. Anderson, Review of p-type doped perovskite materials for SOFC and other applications. Solid State Ionics, 52 (1992) 33-41. 

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