ABSTRACT The microwave dielectric properties of Ca0.85 Nd0.1TiO3-LnAlO3 (Ln = Sm, Gd, Dy, Er) ceramics are investigated in this paper. The structural characteristics of the specimens were evaluated by Rietveld refinement of X-ray diffraction (XRD) patterns and high-resolution transmission electron microscopy (HRTEM). Solid solution limits were dependent on the ionic radius of Ln3+ ions. With the decrease of the ionic radius of the Ln3+ ions, the thermal stability of the resonant frequency decreases. This can be attributed to the increased level of oxygen octahedral distortion caused by the increase in the B-site bond valence in the ABO3 perovskite structure. The dielectric constant (K) and the quality factor (Qf) of the specimens were dependent on the polarizability and grain size, respectively.
Digital Object Identifier 10.1109/TUFFC.2008.759
© 2008, by The Institute of Electrical and Electronics Engineers, Inc. All rights reserved.