Sökning: "perovskites"

Visar resultat 16 - 20 av 43 avhandlingar innehållade ordet perovskites.

  1. 16. Lead-free Metal Halide based Solar Cells

    Författare :Huimin Zhu; Erik Johansson; Gerrit Boschloo; Feng Gao; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Low-toxicity; emerging light harvesters; lead-free; low toxic bismuth; Ag Cs -Bi Sb -I Br systems; 2D perovskites.;

    Sammanfattning : Lead-halide perovskites have recently appeared as very promising materials for solar cells. However, their stability and toxicity may be limiting factors for their application. Therefore, to find new low toxic and high stability light harvesters may be necessary for overcoming the challenges of perovskite solar cells. LÄS MER

  2. 17. Synthesis, Nuclear Structure, and Magnetic Properties of some Perovskite Oxides

    Författare :Mehreteab Tseggai; Per Nordblad; Roland Tellgren; Torbjörn Gustafsson; Uppsala universitet; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; Materials science; Magnetic Perovskites; Neutron powder diffraction; SQUID; Synthesis; Nuclear structure; Antiferromagnetism; Ferromagnetism; Superexchange; Double exchange; Colossal magnetoresistance; Materialvetenskap; Materials science; Teknisk materialvetenskap;

    Sammanfattning : Synthesis, nuclear structure, and magnetic properties of the perovskites: Nd0.7-xMgxSr0.3MnO3 (x=0.0, 0. LÄS MER

  3. 18. Structure and Dynamics in Transition Metal Perovskites — An Optical Spectroscopy Study

    Författare :Johan Bielecki; Chalmers University of Technology; []
    Nyckelord :multiferroics; colossal magnetoresistance; magnetism; proton-conduction; spin-state transition; structure; Ultrafast spectroscopy; high temperature superconductivity; dynamics; Raman;

    Sammanfattning : Transition metal oxides with the perovskite structure exhibit a vast number of exotic properties due to the large number of competing degrees of freedom at the Fermi surface. Together with couplings between and correlations within these degrees of freedom, this class of materials is of high interest from both a practical and theoretical point of view. LÄS MER

  4. 19. Synthesis, Structure and Proton Conduction of Substituted BaTiO3 and BaZrO3 Perovskites

    Författare :Seikh Mohammad Habibur Rahman; Chalmers University of Technology; []
    Nyckelord :deuteron position; Rietveld refinements; heavily doped oxygen deficient perovskite BaTiO3 BaZrO3 ; neutron total scattering; New proton conductor; X-ray and neutron powder diffraction; RMC modelling.; Impedance spectroscopy;

    Sammanfattning : Proton conducting oxides can be beneficial as electrolyte materials in devices such as fuel cells, hydrogen sensors etc. Proton conducting fuel cells (PCFCs), utilising H2 as fuel, stand out as a promising technology for future clean energy generation. LÄS MER

  5. 20. Beyond average crystal structures: understanding extended and local environments in proton-conducting Sc-substituted BaTiO3 perovskites

    Författare :Nico Torino; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES; proton conducting oxide; IR; thermogravimetry; perovskite; neutron scattering; Raman; Reverse Monte Carlo; ordering; BaTiO3;

    Sammanfattning : Proton conducting ceramics are very promising for applications concerned with energy sourcing with cleaner, safer, more abundant and cheaper alternatives to fossil fuels. These materials are still in development and advances in the field depend on a better understanding of the role of defects, their identification and location in the host framework, and the assessment of their short- and long-range dynamics and kinetics. LÄS MER