Abstract
The Ca0.35Li0.25Nd0.35Ti1-x(Zn1/3Ta2/3)xO3 (0 ≤ x ≤ 0.12) ceramics were prepared using the solid-state reaction route. The influence of substitution of (Zn1/3Ta2/3)4+ for Ti4+ on microstructure and microwave dielectric properties of Ca0.35Li0.25Nd0.35Ti1-x(Zn1/3Ta2/3)xO3(CLNT(ZT)x) ceramics was investigated in this study. The X-ray diffraction patterns (XRD) of the specimens showed that the ceramics with x ≤ 0.06 were crystallized as an orthorhombic perovskite structure in Pnma space group. However, the secondary phase of Nd2Ti2O7 was observed with properties of 0.08 ≤ x ≤ 0.12. The analysis results of Raman spectra revealed the existence of oxygen octahedral distortion and the short-range ordering occurred in CLNT(ZT)x ceramics with the change of (Zn1/3Ta2/3)4+ content. The dielectric constant (εr) increased firstly and then decreased gradually when substitution increased, and the variation of εr was affected by the B-site bond valence. The quality factor value (Q × f) was improved by right amount of substitution when x ≤ 0.08, but deteriorated seriously as excessive (Zn1/3Ta2/3)4+ content was added (x ≥ 0.10). The temperature coefficient of the resonant frequency (τf) was effectively reduced from +90.9 ppm/ºC to +30.3 ppm/ºC with the increasing of substitution due to the declination of tolerant factor (t). At last, the CLNT(ZT)0.08 ceramics sintered at 1250 °C for 4 h exhibited the excellent comprehensive dielectric properties with εr = 120.63,Q × f = 3889 GHz, τf = +60.9 ppm/ºC.
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