| 학회 |
한국재료학회 |
| 학술대회 |
2020년 가을 (11/18 ~ 11/20, 휘닉스 제주 섭지코지) |
| 권호 |
26권 1호 |
| 발표분야 |
A. 전자/반도체 재료 분과 |
| 제목 |
Isovalent Ti -site Substitution for Enhanced Quality Factor of MgTiO3 Based Ceramics |
| 초록 |
Microwave dielectric properties of MgTi1-x(Mn1/3Nb2/3)xO3(0≤x≤0.05), MgTi0.995 (Mn1/3Nb2/3)0.005O3(MTMN),(MgTi0.995(Mn1/3Ta2/3)0.005O3(MTMT),(MgTi0.995(Mn1/3Sb2/3)0.005O3 (MTMS)ceramics were investigated at 7~9 GHz. For the specimens sintered at 1400oC for 4h, a single phase with ilmenite structure was observed through the entire range of compositions. MgTi0.995(Mn1/3Nb2/3)0.005O3 showed the highest Qf value of 212,300GHz due to high binding energy of Ti-site in MgTiO3 which were confirmed by XPS method . When x=0.005, it could more prevent the reduction of Ti4+ to Ti3+ than other compositions. Specimens substituted with Sb5+ showed higher Qf value than those of specimens with Nb5+ and/or Ta5+ due to the high degree of Ti-site covalency which is related with bond strength of ilmenite structure. K value was affected by theoretical dielectric polarizabilites of composition ions and TCF was affected by the average distortion of oxygen octahedral. Good microwave dielectric properties was obtained for MgTi0.995(Mn1/3Sb2/3)0.005O3 ; K = 18.05 , Qf = 312,300GHz, TCF = -31.62ppm/˚C |
| 저자 |
Chung JongSeok1, Kim EungSoo2
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| 소속 |
1Department of Materials Engineering, 2Kyonggi Univ. |
| 키워드 |
<P>MgTiO3; XPS; ilmenite; Qf; Covalency</P>
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| E-Mail |
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