Microwave Dielectric Properties of (Mg1-xNix)(Ti0.95(Mg1/3Ta2/3)0.05)O3 Ceramics

Ju Hye Kim; Si Hyun Kim; Eung Soo Kim

doi:10.3740/MRSK.2023.33.8.330

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2023 Vol.33, Issue 8 Preview Page Next Page

Research Paper

Microwave Dielectric Properties of (Mg_1-xNi_x)(Ti_0.95(Mg_1/3Ta_2/3)_0.05)O₃ Ceramics (Mg_1-xNi_x)(Ti_0.95(Mg_1/3Ta_2/3)_0.05)O₃ 세라믹스의 마이크로파 유전 특성

27 August 2023. pp. 330-336

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Abstract

The effects of Ni²⁺ substitution for Mg²⁺-sites on the microwave dielectric properties of (Mg_1-xNi_x)(Ti_0.95(Mg_1/3Ta_2/3)_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 °C for 4h. For the MNTMT specimens with MgO / TiO₂ = 1.07 sintered at 1,400 °C 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 °C 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/°C, due to the increase in tolerance factor (t) and the lower dielectric constant (K).

Keywords

(Mg_1-xNi_x)(Ti_0.95(Mg_1/3Ta_2/3)_0.05)O₃

microwave dielectrics properties

structural characteristics

quality factor

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 33
No :8
Pages :330-336
Received Date : 2023-06-05
Revised Date : 2023-08-01
Accepted Date : 2023-08-02
DOI :https://doi.org/10.3740/MRSK.2023.33.8.330

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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