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Crystal Structure and Ferroelectric Evidence of BaZnSi 3 O 8 , a Low‐Permittivity Microwave Dielectric Ceramic
Author(s) -
Zou ZhengYu,
Song XiaoQiang,
Jiang Lei,
Yuan ChangLai,
Lu WenZhong,
Hu YongMing,
Lei Wen
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202005170
Subject(s) - ferroelectricity , materials science , monoclinic crystal system , ceramic , dielectric , curie temperature , rietveld refinement , microwave , ferroelectric ceramics , analytical chemistry (journal) , crystal structure , dielectric loss , permittivity , mineralogy , crystallography , condensed matter physics , optoelectronics , chemistry , composite material , physics , ferromagnetism , chromatography , quantum mechanics
BaZnSi 3 O 8 ceramic was prepared by the conventional solid‐state method and sintered at 1100 °C. XRD and synchrotron Rietveld refinement analyses revealed the BaZnSi 3 O 8 ceramic presented a monoclinic structure with a space group of P 2 1 / a (No.14), which is reported for the first time. The BaZnSi 3 O 8 ceramic presented a weak ferroelectricity, which was confirmed by the P – E loop and the 90° nanoscale ferroelectric domain. Although ϵ r – T displayed two ϵ r abnormal peaks at 400 °C and 460 °C, the Curie temperature ( T c ) was located at 460 °C according to the dielectric loss and Curie–Weiss law. Moreover, the BaZnSi 3 O 8 ceramic exhibited optimized microwave dielectric properties with ϵ r =6.55, Q × f =52400 GHz, and τ f =−24.5 ppm/°C. Hence, the BaZnSi 3 O 8 ceramic in the ternary BaO‐ZnO‐SiO 2 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.