Synthesis and Crystal Structure–Microwave Dielectric Property Relations in Sn-Substituted Ca3(Zr1-xSnx)Si2O9 Solid Solutions with Cuspidine Structure
Synthesis and Crystal Structure–Microwave Dielectric Property Relations in Sn-Substituted Ca3(Zr1-xSnx)Si2O9 Solid Solutions with Cuspidine Structure
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DOI：
10.1143/jjap.46.7108
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发表时间：
2007-10
影响因子：
1.5
通讯作者：
A. Kan;H. Ogawa;H. Ohsato
中科院分区：
文献类型：
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作者：
A. Kan;H. Ogawa;H. Ohsato
研究了掺锡对Ca3(ZR1-XSnX)Si2O9(CZSS)固溶体微波介电性能和晶体结构的影响。X-射线粉末衍射(XRPD)分析表明，CZSS固溶体为单相，对应于尖晶石型结构。CZSS固溶体的晶格参数随成分x的增加而线性减小，符合Vegard定律。固溶体的介电常数(εr)略有下降，但品质因数(Q·f)从54791增加到93296 GHz，其Qf值在x=1时达到最大值93296 GHz，其谐振频率的介电常数和温度系数分别为8.4ppm/°C和-64.7ppm/°C。介电常数的降低和Q·f值的增大主要取决于成分x，这可能是由于八面体中(Zr，Sn)-O键的共价性增加所致。
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 (εr) of CZSS solid solutions slightly decreased from 10.6 to 8.4, whereas the quality factor (Q·f) of the solid solutions increased from 54791 to 93296 GHz, depending on the composition x. As a result, the highest Q·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·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.