Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Microwave Dielectric Properties of (Mg1-xNix)(Ti0.95(Mg1/3Ta2/3)0.05)O3 Ceramics

(Mg1-xNix)(Ti0.95(Mg1/3Ta2/3)0.05)O3 세라믹스의 마이크로파 유전 특성

  • Ju Hye Kim (Department of Advanced Materials Engineering, Kyonggi University) ;
  • Si Hyun Kim (Department of Advanced Materials Engineering, Kyonggi University) ;
  • Eung Soo Kim (Department of Advanced Materials Engineering, Kyonggi University)
  • 김주혜 (경기대학교 신소재공학과) ;
  • 김시현 (경기대학교 신소재공학과) ;
  • 김응수 (경기대학교 신소재공학과)
  • Received : 2023.06.05
  • Accepted : 2023.08.02
  • Published : 2023.08.27
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Abstract

The effects of Ni2+ substitution for Mg2+-sites on the microwave dielectric properties of (Mg1-xNix)(Ti0.95(Mg1/3Ta2/3)0.05)O3 (0.01 ≤ x ≤ 0.05) (MNTMT) ceramics were investigated. MNTMT ceramics were prepared by conventional solid-state reaction. When the MgO / TiO2 ratio was changed from 1.00 to 1.02, MgTi2O5 was detected as a secondary phase along with the MgTiO3 main phase in the MNTMT specimens sintered at 1,400 ℃ for 4h. For the MNTMT specimens with MgO / TiO2 = 1.07 sintered at 1,400 ℃ for 4h, a single phase of MgTiO3 with an ilmenite structure was obtained from the entire range of compositions. The relative density of all the specimens sintered at 1,400 ℃ for 4h was higher than 95 %. The quality factor (Qf) of the sintered specimens depended strongly on the degree of covalency of the specimens, and the sintered specimens with x = 0.01 showed the maximum Qf value of 489,400 GHz. The dielectric constant (K) decreased with increasing Ni2+ content because Ni2+ had a lower dielectric polarizability (1.23Å3) than Mg2+ (1.32Å3). As Ni2+ content increased, the temperature coefficient of resonant frequency (TCF) improved, from -55.56 to -21.85 ppm/℃, due to the increase in tolerance factor (t) and the lower dielectric constant (K).

Keywords

Acknowledgement

This work was supported by Kyonggi University's Graduate Research Assistantship 2023.

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