Angewandte Chemie International Edition

Cover image for Vol. 57 Issue 9

Editor: Neville Compton, Deputy Editor: Frank Maass. Editor Emeritus: Peter Gölitz

Online ISSN: 1521-3773

Associated Title(s): Angewandte Chemie, Chemistry - A European Journal, Chemistry – An Asian Journal, ChemistryOpen, ChemPhotoChem, ChemPlusChem, Zeitschrift für Chemie

Cover Picture (Angew. Chem. Int. Ed. Engl. 2/1994)

33_02/1994The cover picture shows a Fe3+-doped KNbO3 single crystal (formed from the orthorhombic, ferroelectric phase of KNbO3), which can be obtained from a molten K2O solution at 1050 °C, as well a matchstick for comparison (crystal growth: H. Wüest, ETH Zürich; photograph: M. Bischof, ETH Zürich). The crystals, which are yellow because of the doping with Fe3+ ions, can be used for information storage in a purely optical way (holography). Pure KNbO3 crystals are colorless and are applied in nonlinear optical materials to generate green and blue laser light. The critical review by J. Hulliger on p. 143 ff contains valuable information about crystal growth.

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