Fabrication of lanthanum doped yttria transparent ceramics

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2009,（12）
• 页码范围: 2143-2146
• 页数: 4页
• 语种: 英文
• DOI: 10.1007/s11434-009-0131-5

摘要

Yttria nanocrystalline powder doped with 9% lanthanum was synthesized by co-precipitation method using ammonia for pH adjusting. After calcinations, finer particles with narrow distribution and large surface area were obtained. After dry pressing, samples were sintered at 1500℃-1700℃ for 4 h in vacuum to produce transparent polycrystalline ceramics with uniform grains. Samples with 9 mol%lanthanum were transparent in visible light after being sintered at 1500℃ for 4 h. The grain sizes increased with lanthanum doping compared with those of pure yttria transparent ceramic sintered at the same conditions. Relative density of the transparent ceramic was 99.7%. The in-line transmittance was 73% at 580 nm wavelength after milling and polishing.