Sökning: "tantalum oxide"

Visar resultat 6 - 10 av 12 avhandlingar innehållade orden tantalum oxide.

  1. 6. Physics of palladium metal-oxide-semiconductor devices

    Författare :Mårten Armgarth; Linköpings universitet; []
    Nyckelord :;

    Sammanfattning : This thesis Palladium gate metal-oxide-semiconductor (PdMOS) devices are used as hydrogen sensors. It is shown that the sensitivity is only partly due to the change of the effective work function of the Pd gate on hydrogen adsorption. Sodium ion drift experiments have shown that hydrogen-sodium interactions occur in PdMOS devices. LÄS MER

  3. 7. Studies on phases with monovalent and divalent copper in niobium and tantalum oxides and oxide fluorides : phase analysis, structural relations, distribution and coordination of copper

    Författare :Pierre Ndalamba Wa Ilunga; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The structural chemistry of the oxides and oxide fluorides of copperniobium and copper-tantalum is reviewed. Analogies and differences are pointed out. The distribution and coordination of copper are discussed. . LÄS MER

  4. 8. Hexa- and hepta-coordination in niobium and tantalum oxides and oxide fluorides and structurally related compounds

    Författare :Lena Jahnberg; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : .... LÄS MER

  5. 9. Microbially mediated manganese oxides enriched in yttrium and rare earth elements in the Ytterby mine, Sweden

    Författare :Susanne Sjöberg; Christophe Dupraz; Per Persson; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; manganese oxidizers; birnessite; yttrium and rare earth elements YREE ; biofilms; shallow subsurface; Ytterby mine; geomicrobiology; microbial geochemistry; manganoxiderare; birnessit; yttrium och sällsynta jordartsmetaller YREE ; underjordisk; Ytterby mine; geomikrobiologi; mikrobiell kemi; geokemi; Geochemistry;

    Sammanfattning : Microorganisms are able to manipulate redox reactions and thus exert extensive control on chemical speciation and element partitioning in nature, affecting the formation and dissolution of certain minerals. One of these redox active elements is manganese (Mn), which in its oxidized states (III/IV), commonly forms Mn oxide-hydroxide minerals. LÄS MER

  7. 10. Alkoxide complexes of rhenium - precursors of nanomaterials

    Författare :Olesya Nikonova; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The thesis presents the work constituted by two major parts: (1) – synthesis of new mono-, bi- and trimetallic complexes based on Re, Nb and Ta and their physical-chemical characterization, and (2) – preparation of nanostructural functional materials derived from these complexes. The precursors and materials were characterized by FTIR, NMR, MS, SEM–EDS, TEM and X-ray diffraction. LÄS MER