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A narrow region of Zn‐vacancy‐containing cubic perovskites was formed in the (1− x )Ba 3 (ZnNb 2 )O 9 −( x )Ba 3 W 2 O 9 system up to 2 mol% substitution ( x =0.02). The introduction of cation vacancies enhanced the stability of the 1:2 B‐site ordered form of the structure, Ba(Zn 1− x □ x ) 1/3 (Nb 1− x W x ) 2/3 O 3 , which underwent an order–disorder transition at 1410°C, ∼35° higher than pure Ba(Zn 1/3 Nb 2/3 )O 3 . The Zn vacancies also accelerated the kinetics of the ordering reaction, and samples with x =0.006 comprised large ordered domains with a high lattice distortion ( c/a =1.226) after a 12 h anneal at 1300°C. The tungstate‐containing solid solutions can be sintered to a high density at 1390°C, and the resultant ordered ceramics exhibit some of the highest microwave dielectric Q factors ( Q × f =1 18 000 at 8 GHz) reported for a niobate‐based perovskite.
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Wu et al. (2006) studied this question.
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