Moon, JH Park, HS Lee, KT Choi, JH Yeo, DH Yoon, SJ Kim, HJ 2024-01-21T17:46:16Z 2024-01-21T17:46:16Z 2022-01-11 1997-11 0021-4922 https://pubs.kist.re.kr/handle/201004/143509 The microwave dielectric properties of the (1-x)La2/3TiO3-xLaAlO(3) system in which LaAlO3 having epsilon(r) Q . f(0) = 46,000 (at 7 GHz), and tau(f) = -40- -50ppm/degrees C was incorporated with La2/3TiO3 having epsilon(r) greater than or equal to 90 and positive tau(f) was investigated. The (1-x)La2/3TiO3-xLaAlO(3) crystal system was pseudo-cubic in the range 0.1 less than or equal to x less than or equal to 0.7. Its lattice constant increased with increasing a: even though the amount of LaAlO3 containing Al(0.57 Angstrom) ions which are smaller than Ti(0.64 Angstrom) increased. As the amount of LaAlO3 increased from a: = 0.1 to 0.9, the relative dielectric constant (epsilon(r)) decreased from 50 to 23 and the temperature coefficient of the resonant frequency (tau(f)) decreased from +84 to -50. On the other hand, the value of Q . f(0) reached a maximum (148000 at 9.7GHz) at a: = 0.7, where a rapid increase in the peak intensity of XRD occurred, and further increased after prolonged sintering. The microwave dielectric properties of epsilon(r) = 37, Q . f(0) = 47000 GHz (f(0) = 9 GHz), and tau(f) = -2 ppm/degrees C were obtained near 0.6La(2/3)TiO(3)-0.4LaAlO(3) (x = 0.4) composition. English JAPAN J APPLIED PHYSICS CERAMICS FREQUENCIES Microwave dielectric properties of the (1-x)La2/3TiO3-xLaAlO(3) system Article 10.1143/JJAP.36.6814 1 JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, v.36, no.11, pp.6814 - 6817 JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 36 11 6814 6817 scie scopus 000071172300046 2-s2.0-0031277372 Physics, Applied Physics Article CERAMICS FREQUENCIES La2/3TiO3 LaAlO3 microwave dielectric material dielectric constant (epsilon(r)) unloaded Q temperature coefficient of resonant frequency (tau(f))