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Development of Perovskite-type Cobaltates and Manganates for Thermoelectric Oxide Modules
Weidenkaff, A.,Aguirre, M.H.,Bocher, L.,Trottmann, M.,Tomes, P.,Robert, R. The Korean Ceramic Society 2010 한국세라믹학회지 Vol.47 No.1
Ceramics with perovskite-type structure are interesting functional materials for several energy conversion processes due to their flexible structure and a variety of properties. Prominent examples are electrode materials in fuel cells and batteries, thermoelectric converters, piezoelectrics, and photocatalysts. The very attractive physical-chemical properties of perovskite-type phases can be modified in a controlled way by changing the composition and crystallographic structure in tailor-made soft chemistry synthesis processes. Improved thermoelectric materials such as cobaltates with p-type conductivity and n-type manganates are developed by following theoretical predictions and tested to be applied in oxidic thermoelectric converters.
Development of Perovskite-type Cobaltates and Manganates for Thermoelectric Oxide Modules
A. Weidenkaff,M.H. Aguirre,L. Bocher,M. Trottmann,P. Tomes,R. Robert 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.1
Ceramics with perovskite-type structure are interesting functional materials for several energy conversion processes due to their flexible structure and a variety of properties. Prominent examples are electrode materials in fuel cells and batteries, thermoelectric converters, piezoelectrics, and photocatalysts. The very attractive physical-chemical properties of perovskite-type phases can be modified in a controlled way by changing the composition and crystallographic structure in tailor-made soft chemistry synthesis processes. Improved thermoelectric materials such as cobaltates with p-type conductivity and n-type manganates are developed by following theoretical predictions and tested to be applied in oxidic thermoelectric converters.
Substitutions at the gadolinium and the strontium sites in the RuSr2GdCu2O8 magnetic superconductor
R. Ruiz-Bustos,M. H. Aguirre,E. Mor?n,R. Saez-Puche,M. ?. Alario-Franco 한국물리학회 2002 Current Applied Physics Vol.2 No.6
The coexistence of superconductivity and magnetic order seems to take place in the so called ruthenate-cuprates. Previous workhas mainly focused on RuSr2GdCu 2O8 where a magnetic transition is observed at 133 K and superconductivity has been claimedbelow Tc . 46 K.At room pressure, Sm, Eu and Gd seem to be the only RE elements that accept to enter into the structure of RuSr2GdCu 2O8.However high pressures and temperatures allows one to replace gadolinium by other lanthanide cations, although it is dicult to getpure samples.In order to better understand this, rather unusual behaviour, we have performed some substitutions in the title compound.The synthesis at high pressures (. 60 kbar) and high temperatures (. 1100 .C) of the title new ruthenates has been achieved andthe materials compared to the gadolinium analogue. The structure remains tetragonal (Space group: P 4/mmmrameters linearly decrease following the lanthanide contraction.We have succeeded in replacing Gd by Tb, Dy, Y, Ho and Er, magnetic susceptibility measurements reveal the existence ofinteresting phenomena. The microstructure of these compounds has been studied by high-resolution electron microscopy.Also, at room pressure, we have replaced up to 10% calcium for strontium and observed that, in consonance with the dierence inionic radii, the unit cell contracts. On the other hand, the calcium-doped sample shows a positive magnetic susceptibility at 5 K.. 2002 Elsevier Science B.V. All rights reserved.
Moya, S.A.,Vidal, M.,Abarca, G.,Martinez, C.,Guerchais, V.,Le Bozec, H.,Garland, M.T.,Rodriguez, S.,Aguirre, P. Elsevier 2010 Inorganic chemistry communications Vol.13 No.12
<P><B>Abstract</B></P><P>The synthesis and characterization of new ruthenium(II) carbonyl complexes containing polypyridine and triphenylphosphine ligands is reported. Crystallographic information obtained for the <I>trans-</I>PPh<SUB>3</SUB>-[Ru(biq)(PPh<SUB>3</SUB>)<SUB>2</SUB>(CO)]Cl<SUB>2</SUB> complex (biq=2,2’-biquinoline<B>)</B> reveals five-coordination on the metal. The complexes were studied as catalysts in hydrogen transfer reactions in basic solution. Turnover frequencies in the 2250-817h<SUP>-1</SUP> range were determined in 1 hour of reaction with a substrate/catalysts ratio of 830.</P> <P><B>Graphical Abstract</B></P><P>The synthesis and characterization of new ruthenium(II) carbonyl complexes containing polypyridine and triphenylphosphine ligands is reported. The complexes were studied as catalysts in hydrogen transfer reactions in basic solution.<ce:figure id='f0015'></ce:figure></P>