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Fabrication of transparent or pore‐free oxide ceramics usually requires sintering in a vacuum or reducing atmosphere. In the present paper, a near‐infrared transparent Dy2Zr2O7 ceramic was prepared by ordinary pressureless sintering under the air atmosphere, with a controlled pre‐calcining of raw powders process. The key point of the process is to control the content of the phases by pre‐calcination...
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