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- Title
Crystal Structure and Ferroelectric Evidence of BaZnSi<sub>3</sub>O<sub>8</sub>, a Low‐Permittivity Microwave Dielectric Ceramic.
- Authors
Zou, Zheng‐Yu; Song, Xiao‐Qiang; Jiang, Lei; Yuan, Chang‐Lai; Lu, Wen‐Zhong; Hu, Yong‐Ming; Lei, Wen
- Abstract
BaZnSi3O8 ceramic was prepared by the conventional solid‐state method and sintered at 1100 °C. XRD and synchrotron Rietveld refinement analyses revealed the BaZnSi3O8 ceramic presented a monoclinic structure with a space group of P21/a (No.14), which is reported for the first time. The BaZnSi3O8 ceramic presented a weak ferroelectricity, which was confirmed by the P–E loop and the 90° nanoscale ferroelectric domain. Although ϵr–T displayed two ϵr abnormal peaks at 400 °C and 460 °C, the Curie temperature (Tc) was located at 460 °C according to the dielectric loss and Curie–Weiss law. Moreover, the BaZnSi3O8 ceramic exhibited optimized microwave dielectric properties with ϵr=6.55, Q×f=52400 GHz, and τf=−24.5 ppm/°C. Hence, the BaZnSi3O8 ceramic in the ternary BaO‐ZnO‐SiO2 system possessed both weak ferroelectricity and microwave dielectric properties. These results are expected to break the technical barrier of ferroelectric phase shifter applications in microwave and even millimeter‐wave frequency bands.
- Subjects
DIELECTRIC properties; FERROELECTRIC crystals; CRYSTAL structure; CURIE-Weiss law; DIELECTRIC loss; DIELECTRICS
- Publication
Chemistry - A European Journal, 2021, Vol 27, Issue 19, p5992
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.202005170