Ultrahigh-Q and thermally stable (Sr1−xCax)2Ce0.665Ti0.335O4 microwave dielectric ceramics with low permittivity.
In: Journal of Materials Science: Materials in Electronics, Jg. 32 (2021-07-01), Heft 13, S. 17482-17489
Online
academicJournal
Zugriff:
The Sr 2 Ce 0.665 Ti 0.335 O 4 –0.75 wt% LiF-x mol% CaCO 3 (SCT-xCa, x = 0, 0.25, 0.5, 1.0, 1.5, 2.5) ceramics were prepared by a conventional solid-state reaction technique. The effect of Ca 2+ substitution for Sr 2+ on the phase composition, microstructure and microwave dielectric properties was investigated systematically. The coexistence of Sr 2 CeO 4 and Sr 2 TiO 4 without any other phases indicates that Ca 2+ can dissolve into the SCT lattice. An appropriate amount of Ca 2+ can accelerate the grain growth and produce a compact and homogeneous microstructure, so an ultra-high Q × f value can be achieved. The deterioration in Q × f values with further increasing x is caused by the abnormal grain growth, as well as the increased internal strain, which tends to decrease the structural stability. Meanwhile, the τ f values were found to slightly shift toward the positive direction with decreasing unit cell volume. Excellent microwave dielectric properties of ε r = 20.9, Q × f = 168,580 GHz (8.14 GHz) and τ f = + 0.8 ppm/ o C can be obtained in the x = 0.25 sample sintered at 1150 °C for 4 h, showing great potentials in millimeter wave devices. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Materials Science: Materials in Electronics is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Titel: |
Ultrahigh-Q and thermally stable (Sr1−xCax)2Ce0.665Ti0.335O4 microwave dielectric ceramics with low permittivity.
|
---|---|
Autor/in / Beteiligte Person: | Yu, Mengxin ; Liu, Xiaokai ; He, Lei ; Zuo, Ruzhong |
Link: | |
Zeitschrift: | Journal of Materials Science: Materials in Electronics, Jg. 32 (2021-07-01), Heft 13, S. 17482-17489 |
Veröffentlichung: | 2021 |
Medientyp: | academicJournal |
ISSN: | 0957-4522 (print) |
DOI: | 10.1007/s10854-021-06281-y |
Schlagwort: |
|
Sonstiges: |
|