Crystal structure dependence of the microstructure and microwave dielectric properties of (Sr_xCa_1−x)(Zr_0.95Ti_0.05)O₃ (0 ≤ x ≤ 1) perovskite ceramics

Abstract

Solid-state reaction process has been used to fabricate (SrxCa1-x)(Zr0.95Ti0.05)O3 (0 ≤ x ≤ 1) ceramics, the crystal structure dependence of microstructure and microwave dielectric properties has been investigated. The grain...

The effects of double-site yttria-doping on the structures and dielectric properties of (Ca,Sr)z(Zr,Ti)O3−δ perovskite ceramics

“…8 The change in the Ca/Sr ratio can affect the crystalline phase and the dielectric properties of the (Ca x Sr (1− x ) )ZrO 3 ceramics. 11 The melting temperature of CaZrO 3 ( T m = 2340 °C) is lower than that of SrZrO 3 ( T m = 2750 °C) and the Ca 2+ radius (1.34 Å) is smaller than that of Sr 2+ (1.44 Å), and the lattice strain will be reduced when Ca is substituted to the Sr-site in the lattice. Lower sintering temperature can be obtained, and the grain size in the (Ca,Sr)(Zr,Ti)O 3 ceramics increases significantly as the Ca/Sr ratio increases.…”

“…Through group theory analysis, it is found that there are a total of 24 Raman active modes. [11][12][13]18,19 Fig. 8 presents the Raman spectra of the CSZTY (x = 0, 0.01, 0.025, 0.05, 0.10, 0.15, 0.20) ceramics in the 100 cm À1 to 900 cm À1 frequency range.…”

“…Near zero t f or t c can be obtained in the zirconate systems by doping a tiny amount of Ti 4+ , but the dielectric constant also increased accordingly. 10,11,13,14 How to design materials with e r of 30, a higher value of Q Â f, and near zero t f or t c simultaneously has become a critical issue. [8][9][10][11][12][13][14] It is also necessary to establish the relationship between the microstructure, crystal structure and microwave dielectric properties of perovskite ceramics to optimize their microwave dielectric properties.…”

“…10,11,13,14 How to design materials with e r of 30, a higher value of Q Â f, and near zero t f or t c simultaneously has become a critical issue. [8][9][10][11][12][13][14] It is also necessary to establish the relationship between the microstructure, crystal structure and microwave dielectric properties of perovskite ceramics to optimize their microwave dielectric properties. [15][16][17][18][19] To date, no literature reported the crystal structure dependence of the microstructure and microwave dielectric properties of the same element double substituted at the A-site and B-site in CSZT perovskite ceramics.…”

Effect of B-site complex substitutions on orthorhombic distortion and microwave dielectric properties of Ca(Zr0.95Ti0.05)O3 perovskites

“…Parida et al 16 also investigated that the microwave dielectric properties vary in the Sr(Zr x Ti 1− x )O 3 (0 ≤ x ≤ 1) system and concluded that the ε r value decreased from 253.0 to 25.0 with increasing Zr content and the τ f value was +1771.0 ppm °C −1 for SrTiO 3 that decreased to −82.0 ppm °C −1 for SrZrO 3 . Wang et al 17 investigated the perovskite Sr(Zr 0.95 Ti 0.05 )O 3 ceramic that possessed optimum microwave dielectric properties of ε r ∼ 36.4, Q × f ∼ 26 300 GHz and τ f ∼ −2.5 ppm °C −1 . However, the modified CaZrO 3 did not satisfy practical requirements due to their poor microwave dielectric properties.…”