SOHN, JH INAGUMA, Y YOON, SO ITOH, M NAKAMURA, T YOON, SJ KIM, HJ 2024-01-21T21:34:04Z 2024-01-21T21:34:04Z 2021-09-01 1994-09 0021-4922 https://pubs.kist.re.kr/handle/201004/145523 The microwave dielectric characteristics of ilmenite titanates, M(2+)TiO(3) (where M(2+)=Ni, Mg and Mn) and (Mg(0.95)M(0.05)(2+)TiO(3) (where, M(2)=Ni, Mg, Co and Mn) series, have been investigated as a function of ionic radius of M(2+) and (Mg(0.95)M(0.05)(2+))(2+) ions, respectively. The ilmenite titanates have high Q value and low dielectric constant due to the isolation of TiO6 octahedra by the MO(6) octahedron layer and cation vacancy layer in comparison with the perovskite titanates. The existence of localized 3d electrons in N2+(3d(8)) and Mn2+(3d(5)) is concerned with the microwave dielectric properties of the M(2+)TiO(3) series. The dielectric constant, epsilon(r) at 10 GHz of the (Mg(0.9)5M(0.05)(2+)) TiO3 series shows the minimum value around the average ionic radius of 0.721 Angstrom A while the Q value shows a maximum, probably due to a local lattice distortion. The Mg(0.9)5Co(0.05))TiO3 compound shows a maximum Q value of 23,000 at 10 GHz, dielectric constant of 16.8, and tau(f) of -54 ppm/K. English JAPAN J APPLIED PHYSICS CERAMICS MICROWAVE DIELECTRIC CHARACTERISTICS OF ILMENITE-TYPE TITANATES WITH HIGH Q-VALUES Article 10.1143/JJAP.33.5466 1 JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, v.33, no.9B, pp.5466 - 5470 JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 33 9B 5466 5470 scie scopus A1994PM61600084 2-s2.0-0028508276 Physics, Applied Physics Article; Proceedings Paper CERAMICS MICROWAVE DIELECTRICS ILMENITE TITANATES HIGH Q VALUE TIO6 OCTAHEDRA IONIC RADIUS