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1. Introduce – Yttrium is a silvery-metallic rare-earth element that, despite its chemical classification, is often grouped with lanthanides due to its similar properties and co-occurrence in minerals like xenotime and monazite. – The production of high-purity yttrium oxide (Y₂O₃) involves sophisticated multi-stage solvent extraction processes to effectively isolate yttrium from other rare-earth elements, achieving the strict standards required for advanced materials science. – Yttrium oxide is a foundational material in modern technology; its exceptional thermal stability an...