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  • Resultat 101-114 av 114
  • Föregående 1234[5]
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  • Björling, Thomas, et al. (författare)
  • SrAlSiH : A polyanionic semiconductor hydride
  • 2005
  • Ingår i: Angewandte Chemie International Edition. - 1433-7851. ; 44:44, s. 7269-7273
  • Tidskriftsartikel (refereegranskat)abstract
    • (Chemical Equation Presented) Stable and semiconducting: Polyanionic hydrides represent a new class of main-group-metal hydrides with unforeseen hydrogen-coordination environments. The hydrogen atom in SrAlSiH is attached exclusively to Al and forms part of a layered [AlHSi]2- polyanion (see figure). This material is the first narrow bandgap semiconductor hydride and combines the high thermal stability of saline hydrides with the air and moisture stability of interstitial transition-metal hydrides.
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  • Hode Vuorinen, Jaana, et al. (författare)
  • Nb-, Zr- and LREE-rich titanite from the ALnö alkaline complex: : Crystal chemistry and its importance as a petrogenetic indicator
  • 2005
  • Ingår i: Lithos. - Elsevier B.V.. - 0024-4937. ; 83:1-2, s. 128-142
  • Tidskriftsartikel (refereegranskat)abstract
    • Titanite occurs as an accessory phase in melteigite, ijolite and nepheline syenite from the Alnö alkaline intrusion and is typically associated with Ti-andradite and calcite±perovskite. Titanite from 7 samples was investigated using microanalytical techniques including EMPA, 57Fe Mössbauer spectroscopy, powder X-ray diffractometry and FTIR-spectroscopy. A common feature of the analysed titanite is high amounts of Nb2O5 (up to 7.3 wt.%), ZrO2 (up to 2.8 wt.%) and LREE2O3 (up to 3.9 wt.%), and significant amounts of Al2O3+Fe2O3 (up to 4.3 wt.%). Important substitutions are consequently (i) 2[7]Ca→[7]Na++[7]LREE3+, (ii) [7]Ca2++[6]Ti4+→[7]LREE3++[6](Al, Fe3+), (iii) 2[6]Ti4+→[6]M5++[6](Al, Fe3+). Zr is most likely accommodated into the structure through simple direct isovalent octahedral substitution for Ti, contrasting with other proposed, more complex models for Zr-incorporation in titanite. Stoichiometric calculations indicate all iron to be present as Fe3+ but 57Fe Mössbauer analyses show a small fraction (10%) of ferrous iron to be present as well. FTIR-spectroscopy indicate 0.14–0.26 wt.% H2O in the investigated titanites and X-ray diffraction data yield cell parameters close to the ideal synthetic end-member values. Chondrite normalised LREE patterns for the analysed titanites show (Ce+Pr)N>LaN similar to patterns reported from other occurrences and enrichment factors are typically in the order of 103–104. Comparison of whole rock Nb-, Zr- and LREE-contents with variations in modal amounts of trace element enriched titanite shows a significant effect which needs to be addressed when modeling magma evolution. The use of the prv–ttn assemblage for estimating silica-activity during crystallization of silica undersaturated alkaline rocks is discussed.
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  • Resultat 101-114 av 114
  • Föregående 1234[5]
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