Synthesis and Crystal Structure–Microwave Dielectric Property Relations in Sn-Substituted Ca3(Zr1-xSnx)Si2O9 Solid Solutions with Cuspidine Structure

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The effects of Sn substitution for Zr on the microwave dielectric properties and crystal structure of Ca3(Zr1-xSnx)Si2O9 (CZSS) solid solutions were investigated in this study. The X-ray powder diffraction (XRPD) patterns of CZSS solid solutions were indicated to be a single phase, which corresponded to the cuspidine-type structure. The lattice parameters of CZSS solid solutions linearly decreased with increasing composition $x$, following Vegard's law. The dielectric constant ($\varepsilon_{\text{r}}$) of CZSS solid solutions slightly decreased from 10.6 to 8.4, whereas the quality factor ($Q\cdot f$) of the solid solutions increased from 54791 to 93296 GHz, depending on the composition $x$. As a result, the highest $Q\cdot f$ value of 93296 GHz was obtained at $x=1$ where the dielectric constant and temperature coefficient of resonant frequency were 8.4 and $-64.7$ ppm/°C, respectively. The decreases in the dielectric constant and the increase in $Q\cdot f$ values primarily depend on the composition $x$. This may be caused by the increase in the covalency of the (Zr,Sn)–O bond in the octahedron.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2007-10-30