Sökning: "perovskit"

Hittade 4 avhandlingar innehållade ordet perovskit.

  1. 1. Structure and Properties Investigations of the La2Co1+z(Ti1-xMgx)1-zO6 Perovskite System

    Författare :Samrand Shafeie; Gunnar Svensson; Mari-Ann Einarsrud; Mats Johnsson; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; solid oxide fuel cell; SOFC; LaCoO3; cobaltates; cobalt oxide; perovskite; XANES; XRD; Neutron powder diffraction; thermal expansion; electronic conductivity; magnetism; citrate; electron diffraction; synthesis; phase diagram; spin state; fast fas oxid bränslecell; LaCoO3; koboltoxid; perovskit; XANES; XRD; neutron diffraktion; elektron diffraktion; termisk expansion; elektrisk ledningsförmåga; magnetism; citrat; SOFC; syntes; fasdiagram; spin tillstånd; Solid state chemistry; Fasta tillståndets kemi; Materials chemistry; Materialkemi; Structural Chemistry; strukturkemi; Materials Chemistry; materialkemi;

    Sammanfattning : Perovskite based materials have great potentials for various energy applications and the search for new materials for uses in SOFCs has largely been concentrated to this class of compounds. In this search, we have studied perovskite phases in the system La2Co1+z(Ti1-xMgx)1-zO6, with 0  x 0.9 and z = 0.0, 0. LÄS MER

  2. 2. Nanomaterials for high-temperature catalytic combustion

    Författare :Erik Elm Svensson; Sven Järås; Magali Boutonnet; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; catalytic combustion; microemulsion; hexaaluminate; magnesia; perovskite; ceria; methane; gas turbine; katalytisk förbränning; mikroemulsion; hexaaluminat; magnesia; perovskit; ceriumdioxid; metan; gasturbin; Catalysis; Katalys;

    Sammanfattning : Katalytisk förbränning är en lovande teknik för användning vid kraftgenerering, särskilt för gasturbiner. Genom att använda katalytisk förbränning kan man nå mycket låga emissioner av kväveoxider (NOX), kolmonoxid (CO) och oförbrända kolväten (UHC) samtidigt, vilket är svårt vid konventionell förbränning. LÄS MER

  3. 3. Properties in New Complex Perovskite-Related Materials, a Matter of Composition and Structure

    Författare :Samrand Shafeie; Gunnar Svensson; Jekabs Grins; John T. S. Irvine; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Perovskite; XANES; XRPD; NPD; TEC; TEM; SEM; TGA; SAED; HREM; thermal expansion; Seebeck coefficient; electronic conductivity; SOFC materials; magnetic susceptibility; Perovskit; XANES; XRPD; NPD; TEC; TEM; SEM; TGA; SAED; HREM; termisk expansion; Seebeck koefficient; elektrisk ledningsförmåga; SOFC material; magnetiska egenskaper; materialkemi; Materials Chemistry;

    Sammanfattning : This PhD thesis presents investigations of perovskite-related compounds in systems of interest for applications in components in solid oxide fuel cells. The compound compositions derive from substitutions in the parent compounds LaCoO3, LaCrO3 and SrFeO3. LÄS MER

  4. 4. Semiconductor-ionic Materials for Low Temperature Solid Oxide Fuel Cells

    Författare :Muhammad Afzal; Andrew R. Martin; Peter Lund; Hab. Armelle Ringuede; KTH; []
    Nyckelord :Semiconductor-ionic materials; electrolyte-layer free fuel cell; low temperature solid oxide fuel cell; fuel to electricity conversion; Schottky junction; theoretical and experimental curves; Halvledar-joniska material; elektrolytskikt-fri bränslecell; lågtemperatur fastoxidbränslecell; bränsle till elomvandling; Schottky junction; teoretiska och experimentella kurvor; Energiteknik; Energy Technology;

    Sammanfattning : Solid oxide fuel cell (SOFC) is considered as an attractive candidate for energy conversion within the fuel cell (FC) family due to several advantages including environment friendly, use of non-noble materials and fuel flexibility. However, due to high working temperatures, conventional SOFC faces many challenges relating to high operational and capital costs besides the limited selection of the FC materials and their compatibility issues. LÄS MER