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- W2019648230 abstract "Bei Drucken bis zu 30 kb und Temperaturen von 1000–1500°C konnte in der Al2SiO5-Modifikation Disthen (Kyanit) Al3+ durch Cr3+ bis zu einer Zusammensetzung (Al1,5Cr0,5)SiO5 substituiert werden. Die Gitterkonstanten ao, bo, co steigen im Verlauf der Substitution an, die triklinen Achsenwinkel α, β, γ bleiben praktisch unverandert. Cr3+ wird in die co-parallelen Oktaederketten der Struktur eingebaut. Das Remissionsspektrum (240–1000 nm) zeigt auser den erlaubten d–d Ubergangen des Cr3+ in oktaedrischer Koordination auch Interkombinationsbanden. Die Halbwertsbreite (∼ 3,8 kK), Lage und Gestalt der 10 Dq-Bande weist auf eine Symmetrie nicht hoher als D4h der Cr3+-haltigen Oktaeder hin. Dies ist in Ubereinstimmung mit der Strukturverfeinerung des reinen Disthens (Burnham 1963).At pressures up to 30 kb and temperatures of 1000–1500°C up to 25% of the Al3+ in the Al2SiO2-polymorph kyanite could be replaced by Cr3+ (composition (Al1.5Cr0.5)SiO5). The lattice constants a0, b0, c0 increase by this substitution, whereas the triclinic angles α, β, γ remain virtually unaffected. Cr3+ substitutes for Al in the chains of (AlO3+)-octahedra parallel to c0. The reflectance spectrum (240-1000 nm) exhibits the spin-forbidden ruby lines in addition to the spin-allowed transitions in Cr3+ in octahedral coordination. The half width (∼3.8 kK), position, and shape of the 10 Dq band indicates a symmetry not higher than D4h for the Cr3+-containing octahedra which is in accordance with structure refinement data for pure Kyanite (Burnham 1963)." @default.
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- W2019648230 date "1971-06-01" @default.
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- W2019648230 title "High Pressure ? High Temperature ? Synthesis and Properties of Chromium Kyanite, (Al, Cr)2SiO5" @default.
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- W2019648230 doi "https://doi.org/10.1002/zaac.19713830104" @default.
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