New 8-Layer Twinned Hexagonal Perovskite Microwave Dielectric Ceramics Ba8Ga4–xTa4+0.6xO24
Source abstract
Abstract
An 8-layer B-site deficient twinned hexagonal perovskite Ba 8 Ga 4– x Ta 4+0.6 x O 24 has been synthesized and its structure and microwave dielectric properties characterized. This hexagonal perovskite consists of eight close-packed BaO 3 layers stacked by a sequence of (ccch) 2, where c and h refer to cubic and hexagonal BaO 3 layers, respectively. The Ba 8 Ga 4– x Ta 4+0.6 x O 24 ceramic materials exhibit composition-independent dielectric permittivity ε r ≈ 29, improved Q f value with the B-site vacancy content increase, and tunable temperature coefficient of resonant frequency τ f from negative to positive. An optimum microwave dielectric performance was achieved for Ba 8 Ga 0.8 Ta 5.92 O 24: Q f ≈ 29 000 GHz and τ f ≈ 11 ppm/°C. The factors controlling the microwave dielectric properties are discussed in comparison with 8-layer twinned analogues and related 10-layer twinned hexagonal perovskites based on their structural and property data.
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Research context
OpenAlex topics: Microwave Dielectric Ceramics Synthesis · Ferroelectric and Piezoelectric Materials · Layered Double Hydroxides Synthesis and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
Department of Chemistry, The University of Liverpool, Liverpool, L69 7ZD, United Kingdom
Conditions Extrêmes et Matériaux: Haute Température et Irradiation, CNRS UPR 3079, 1D Avenue de la Recherche Scientifique, 45071 Orléans Cedex 2, France and Université d’Orléans, Faculté des Sciences, Avenue du Parc Floral, 45067 Orléans Cedex 2, France
Ceramic Division, Powerwave (U. K.) Ltd., Enterprise Drive, Station Road, Four Ashes, Wolverhampton, WV10 7DB, United Kingdom
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