INCORPORATION OF NITROGEN IN ALKALINE-EARTH HEXAALUMINATES WITH A BETA-ALUMINA-TYPE OR A MAGNETOPLUMBITE-TYPE STRUCTURE

A feasibility study is presented concerning the incorporation of N3- i n alkaline-earth aluminates with a magnetoplumbite- or beta-alumina-ty pe structure. A comparison is made with Mg2+-substituted alkaline-eart h aluminates with a magnetoplumbite or beta-alumina-type structure. Va rious techniques such as X-ray diffraction, luminescence spectroscopy (on Eu2+-doped samples), Al-27 magic angle spinning nuclear magnetic r esonance spectroscopy, and IR spectroscopy are used in order to distin guish between the magnetoplumbite- and the beta-alumina-type structure as well as to investigate the incorporation of N3- and Mg2+ The incor poration of N3- is possible for materials with a beta-alumina-type str ucture, resulting in BaAl11O16N, but negligible for materials with a m agnetoplumbite-type structure (Sr and Ca).