Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Microwave Dielectric Properties of Sr-Substituted Ba(Mg0.5W0.5)O3 Ceramics

  • Yoon, Sang-Ok (Department of Advanced Ceramic Materials Engineering, Gangneung-Wonju National University) ;
  • Choi, Dong-Kyu (Department of Advanced Ceramic Materials Engineering, Gangneung-Wonju National University) ;
  • Oh, Jun-Hyuk (Department of Advanced Ceramic Materials Engineering, Gangneung-Wonju National University) ;
  • Kim, Shin (Department of Advanced Ceramic Materials Engineering, Gangneung-Wonju National University)
  • Received : 2018.04.13
  • Accepted : 2018.05.18
  • Published : 2018.07.31
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Abstract

The phase evolution, microstructure, and microwave dielectric properties of Sr-substituted $Ba(Mg_{0.5}W_{0.5})O_3$ ceramics, i.e., $(Ba_{1-x}Sr_x)(Mg_{0.5}W_{0.5})O_3$ ($0{\leq}x{\leq}0.30$), sintered at $1700^{\circ}C$ for 1 h were investigated. All compositions showed a 1 : 1 ordered perovskite structure. In all the compositions, $BaWO_4$ was detected as the secondary phase. With increasing x in ($Ba_{1-x}Sr_x$) $(Mg_{0.5}W_{0.5})O_3$, the lattice parameter increased linearly, indicating that a substitutional solid solution occurred. All compositions exhibited a dense microstructure. The value of ${\varepsilon}_r$ increased slightly with increasing x. The value of $Q{\times}f_0$ increased with the increase in x up to x = 0.10 and reached a saturated value of about 100,000 GHz. The composition for x = 0.20, i.e., $(Ba_{0.80}Sr_{0.20})(Mg_{0.5}W_{0.5})O_3$, sintered at $1700^{\circ}C$ for 1 h exhibited superior microwave dielectric properties of ${\varepsilon}_r=19.6$, $Q{\times}f_0=99,358GHz$, and ${\tau}_f=0.0ppm/^{\circ}C$, respectively.

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References

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