Abstract
Microwave dielectric properties of (1-x)CaWO4-xLnNbO4 (Ln = Nd, Sm) ceramics were investigated as a function of LnNbO4 content (0.05 ≤ × ≤ 0.30). Solid solutions with scheelite structure were obtained with LnNbO4 content up to x = 0.3 of Ln = Nd and/or x = 0.2 of Ln = Sm, respectively. The unit-cell volume was decreased with the increase of B-site bond valence. For the solid solutions, dielectric constant (K) was slightly increased with LnNbO4 content and K of the specimens with NdNbO4 was higher than that of SmNbO4. This result was due to the larger dielectric polarizability of NdNbO4 (17.02 A) than SmNbO4 (16.75 A). The quality factor (Qf) was dependent on the microstructure of the specimens. Temperature coefficient of resonant frequency (TCF) increased with the increase of LnNbO4 content due to the decrease of the differences between A-site and B-site bond valence in ABO4 scheelite.
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