Preparation and Properties of Transition Metal Beta Aluminas.
CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING
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Ion exchange techniques were used to produce a family of 3d transition metal Beta-alumina single crystals. Complete or nearly complete replacement was obtained for Cr3, Mn2, and Ni2 compositions. Optical properties of the crystals were studied and both broad absorption and broad fluorescence bands were observed. Environmental exposure produced detrimental effects over long time periods, suggesting hydration of the conduction planes. The preparation of a new family of Beta aluminas by the substitution of 3d transition metal ions for Na ions has enabled us to begin investigating a new series of materials with potential as solid state tunable lasers. The optical properties of these materials compare favorably with those of materials previously studied, and the vast benefits of ion exchange as a preparation technique permit the synthesis of many samples covering a wide variety of active ion concentrations. Initial results with Cr3 exchanged Beta alumina indicate that hydration effects may influence the optical properties of this material.
- Solid State Physics