Abstract
Rare-earth aluminates, LnAlO3 (Ln = Dy, Er, Gd, La, Nd, Pr, Sm, and Y) were prepared using the mixed oxide method, and their microwave dielectric properties were examined at X-band. Most rare-earth aluminates have suitable permittivities and quality factors for applications as dielectric resonators, but a modification of τf is necessary due to the coefficient’s large negative value. When considering dielectric properties and lattice matching, YalO3 rather than LaAlO3, was suggested as a promising substrate material for microstrip antennas utilizing high-temperature superconductor thin films. Rare-earth aluminates with a rhombohedral structure exhibited larger permittivities than those with an orthorhombic structure. This difference was attributed to the difference in ionic size and coordination number. It was demonstrated that a nonzero magnetic susceptibility of rare-earth aluminates has an adverse effect on their quality factor. An abrupt variation in the temperature coefficient of permittivity was discussed in terms of oxygen octrahedra tilting.
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References
H. M. O’Bryan, P. K. Gallagher, G. W. Berkstresser, and C. D. Brandle, J. Mater. Res. 5, 183 (1990).
D. C. Dube and H. J. Scheel, J. Appl. Phys. 75 (8), 4126 (1994).
R. Brown, V. Pendrick, D. Kalokitis, and B. H. T. Chai, Appl. Phys. Lett. 57 (13), 1351 (1990).
J. M. Phillips, M. P. Siegal, R. B. Dover, T. H. Tiefel, J. H. Marshall, C. D. Brandle, and G. Berstresser, J. Mater. Res. 7, 2650 (1992).
F. S. Galasso, Structure, Properties and Preparation of Perovskite-type Compounds (Pergamon Press, Oxford, 1969), pp. 19–22.
B.W. Hakki and P.D. Coleman, IRE Trans. Microwave Theory Tech. 8, 402 (1960).
E. L. Ginzton, Microwave Measurements (McGraw-Hill, New York, 1957), p. 403.
R. D. Shannon, J. Appl. Phys. 73 (1), 348 (1993).
T.C. Edwards, Foundations for Microstrip Circuit Design (John Wiley & Sons, New York, 1981).
A. R. West, Solid State Chemistry and Its Applications (John Wiley & Sons, New York, 1984).
S. Cotton, Lanthanides and Actides (Macmillan Physical Science Series, London, 1991), p. 11.
I. M. Leaney, E. L. Colla, and N. Setter, Jpn. J. Appl. Phys. 33 (7A), 3981 (1994).
D. M. Pozar, Microwave Engineering (Addison Wesley, New York, 1990).
D.E. Oates, A.C. Anderson, and P. M. Mankiewich, J. Supercond. 3 (3), 251 (1990).
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Cho, SY., Kim, IT. & Hong, K.S. Microwave dielectric properties and applications of rare-earth aluminates. Journal of Materials Research 14, 114–119 (1999). https://doi.org/10.1557/JMR.1999.0018
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DOI: https://doi.org/10.1557/JMR.1999.0018