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A new sintering technique for transparent PLZT ceramics was developed which uses a unique two-stage process involving both vacuum hot pressing for a short time (first stage) and atmosphere sintering (second stage). By this process we obtained highly transparent, virtually colorless, and extremely pore-free PLZT 9/65/35. The quality of materials fabricated by this process depends strongly upon the method of controlling the liquid phase excess lead oxide in the grain boundaries.
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Okazaki et al. (1976) studied this question.
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