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|Yttrium Oxide is versatile; it is essential for television phosphors, for microwave garnets, for laser crystals and for high-performance ceramics, to name but a few advanced applications. When produced commercially, the material must satisfy not only stringent specifications regarding chemical purity but, increasingly, also meet closely defined physical parameters. The techniques needed for its production range from solvent extraction to carefully controlled precipitation and calcination. The processing steps from mineral concentrate to pure oxide will be described and related to the final oxide. The simple word "material" has complex connotations; it means, to paraphrase "Alice", exactly what we want it to mean. Throw in the label "advanced" and the picture darkens further! Just what is an advanced material and how does it differ from a common-or-garden material?|